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In Wolff-Parkinson-White (WPW) syndrome, an extra electrical pathway between your heart's upper and lower chambers causes a rapid heartbeat. The extra pathway is present at birth and fairly rare.The episodes of fast heartbeats usually aren't life-threatening, but serious heart problems can occur. Treatment can stop or prevent episodes of fast heartbeats. A catheter-based procedure (ablation) can permanently correct the heart rhythm problems.Most people with an extra electrical pathway experience no fast heartbeat. This condition, called Wolff-Parkinson-White pattern, is discovered only by chance during a heart exam. Although WPW pattern is often harmless, doctors might recommend further evaluation before children with WPW pattern participate in high-intensity sports.

Triple X syndrome, also called trisomy X, is a genetic disorder that affects about 1 in 1,000 females. Females normally have two X chromosomes in all cells — one X chromosome from each parent. In triple X syndrome, a female has three X chromosomes.Many girls and women with triple X syndrome have no symptoms or only mild symptoms. In other cases, symptoms may be more pronounced — possibly including developmental delays and learning disabilities.Treatment for triple X syndrome depends on which symptoms, if any, are present and their severity. Normal sexual development and the ability to have children are typical for most females who have triple X syndrome.

Yellow fever virus is found in tropical and subtropical areas in South America and Africa. The virus is transmitted to people by the bite of an infected mosquito. Yellow fever is a very rare cause of illness in U.S. travelers. Illness ranges in severity from a self-limited febrile illness to severe liver disease with bleeding. Yellow fever disease is diagnosed based on symptoms, physical findings, laboratory testing, and travel history, including the possibility of exposure to infected mosquitoes. There is no specific treatment for yellow fever; care is based on symptoms. Steps to prevent yellow fever virus infection include using insect repellent, wearing protective clothing, and getting vaccinated.

Zollinger-Ellison syndrome is a rare condition in which one or more tumors form in your pancreas or the upper part of your small intestine (duodenum). These tumors, called gastrinomas, secrete large amounts of the hormone gastrin, which causes your stomach to produce too much acid. The excess acid then leads to peptic ulcers, as well as to diarrhea and other symptoms.

Zollinger-Ellison syndrome (ZES) is rare. The disease may occur at any time in life, but people are usually diagnosed between ages 20 and 50. Medications to reduce stomach acid and heal the ulcers is the usual treatment for Zollinger-Ellison syndrome.

A drug allergy is the abnormal reaction of your immune system to a medication. Any medication — over-the-counter, prescription or herbal — is capable of inducing a drug allergy. However, a drug allergy is more likely with certain medications.

The most common signs and symptoms of drug allergy are hives, rash or fever. A drug allergy may cause serious reactions, including a life-threatening condition that affects multiple body systems (anaphylaxis).

A drug allergy is not the same as a drug side effect, a known possible reaction listed on a drug label. A drug allergy is also different from drug toxicity caused by an overdose of medication.

Dry eyes is a common condition that occurs when your tears aren't able to provide adequate lubrication for your eyes. Tears can be inadequate for many reasons. For example, dry eyes may occur if you don't produce enough tears or if you produce poor-quality tears.

Dry eyes feel uncomfortable. If you have dry eyes, your eyes may sting or burn. You may experience dry eyes in certain situations, such as on an airplane, in an air-conditioned room, while riding a bike or after looking at a computer screen for a few hours.

Treatments for dry eyes may make you more comfortable. These treatments can include lifestyle changes and eyedrops. You'll likely need to take these measures indefinitely to control the symptoms of dry eyes.

The typical scenario for dry socket is the occurrence of throbbing pain about two to four days after the tooth is extracted. Dry socket pain is often accompanied by bad breath and a foul taste in the mouth. With this onset of pain, it is obvious that proper healing has been interrupted.

Dry socket is a condition in which there is inflammation of the jawbone (or alveolar bone) after a tooth extraction. It is also referred to as "alveolar osteitis" and is one of the many complications that can occur from a tooth extraction. The occurrence of dry socket is relatively rare, occurring in about 2% of tooth extractions. However, that percentage rises to at least 20% when it involves the removal of mandibular impacted third molars (lower wisdom teeth).

Dumping syndrome is a condition that can develop after surgery to remove all or part of your stomach or after surgery to bypass your stomach to help you lose weight. Also called rapid gastric emptying, dumping syndrome occurs when food, especially sugar, moves from your stomach into your small bowel too quickly.

Most people with dumping syndrome develop signs and symptoms, such as abdominal cramps and diarrhea, 10 to 30 minutes after eating. Other people have symptoms one to three hours after eating, and still others have both early and late symptoms.

Generally, you can help prevent dumping syndrome by changing your diet after surgery. Changes might include eating smaller meals and limiting high-sugar foods. In more-serious cases of dumping syndrome, you may need medications or surgery.

Dust mite allergy is an allergic reaction to tiny bugs that commonly live in house dust. Signs of dust mite allergy include those common to hay fever, such as sneezing and runny nose. Many people with dust mite allergy also experience signs of asthma, such as wheezing and difficulty breathing.

Dust mites, close relatives of ticks and spiders, are too small to see without a microscope. Dust mites eat skin cells shed by people, and they thrive in warm, humid environments. In most homes, such items as bedding, upholstered furniture and carpeting provide an ideal environment for dust mites.

By taking steps to reduce the number of dust mites in your home, you may get control of dust mite allergy. Medications or other treatments are sometimes necessary to relieve symptoms and manage asthma.

Dysarthria is a condition in which the muscles you use for speech are weak or you have difficulty controlling them. Dysarthria often is characterized by slurred or slow speech that can be difficult to understand.

Common causes of dysarthria include nervous system (neurological) disorders such as stroke, brain injury, brain tumors, and conditions that cause facial paralysis or tongue or throat muscle weakness. Certain medications also can cause dysarthria.

Dysarthria treatment is directed at treating the underlying cause of your condition when possible, which may improve your speech. You may have speech therapy to help improve speech. For dysarthria caused by prescription medications, changing or discontinuing the medications may help.

Dyshidrosis, also known as dyshidrotic eczema or pompholyx, is a skin condition in which very small, fluid-filled blisters appear on the palms of your hands and the sides of your fingers. The soles of your feet also can be affected.

The blisters that occur in dyshidrosis generally last around three weeks and cause intense itching. Once the blisters of dyshidrosis dry, your skin may appear scaly. The blisters typically recur, sometimes before your skin heals completely from the previous blisters.

Treatment for dyshidrosis most often includes creams or ointments that you rub on the affected skin. In severe cases, your doctor may suggest corticosteroid pills, such as prednisone, or injections.

Difficulty swallowing (dysphagia) means it takes more time and effort to move food or liquid from your mouth to your stomach. Dysphagia may also be associated with pain. In some cases, swallowing may be impossible.

Occasional difficulty swallowing, which may occur when you eat too fast or don't chew your food well enough, usually isn't cause for concern. But persistent dysphagia may indicate a serious medical condition requiring treatment.

Dysphagia can occur at any age, but it's more common in older adults. The causes of swallowing problems vary, and treatment depends on the cause.

An ectopic pregnancy is an early pregnancy that occurs outside of the normal location (uterine lining) for a developing pregnancy. Most ectopic pregnancies occur in the Fallopian tubes. An ectopic pregnancy cannot progress normally and typically results in the death of the embryo or fetus.

Eggs are one of the most common allergy-causing foods for children.

Egg allergy symptoms usually occur a few minutes to a few hours after eating eggs or foods containing eggs. Signs and symptoms range from mild to severe and can include skin rashes, hives, nasal congestion, and vomiting or other digestive problems. Rarely, egg allergy can cause anaphylaxis — a life-threatening reaction.

Egg allergy can occur as early as infancy. Most children, but not all, outgrow their egg allergy before adolescence.

Eisenmenger (I-sun-meng-uhr) syndrome is a complication of a heart defect that you're born with (congenital).

A heart defect that causes a hole (shunt) to develop between two chambers of your heart is the most common cause of Eisenmenger syndrome. This hole causes blood to circulate abnormally in your heart and lungs. Increased blood flow returns to your lungs instead of going to the rest of your body. The blood vessels in your lung arteries become stiff and narrow, increasing the pressure in your lungs' arteries. This permanently damages the blood vessels in your lungs.

Eisenmenger syndrome occurs when the increased pressure of the blood flow in the lung becomes so great that the direction of blood flow through the shunt reverses. Oxygen-poor (blue) blood from the right side of the heart flows into the left ventricle and is pumped to your body so you don't receive enough oxygen to all your organs and tissues.

Eisenmenger syndrome is a life-threatening condition requiring careful medical monitoring. Medications can improve symptoms and prognosis.

 Central nervous system (CNS) embryonal tumors form in embryonic cells that remain in the brain after birth. CNS embryonal tumors tend to spread through the cerebrospinal fluid (CSF) to other parts of the brain and spinal cord.

The tumors may be malignant (cancer) or benign (not cancer). Most CNS embryonal tumors in children are malignant. Malignant brain tumors are likely to grow quickly and spread into other parts of the brain. When a tumor grows into or presses on an area of the brain, it may stop that part of the brain from working the way it should. Benign brain tumors grow and press on nearby areas of the brain. They rarely spread to other parts of the brain. Both benign and malignant brain tumors can cause signs or symptoms and need treatment.

Although cancer is rare in children, brain tumors are the third most common type of childhood cancer, after leukemia and lymphoma. This summary is about the treatment of primary brain tumors (tumors that begin in the brain). The treatment of metastatic brain tumors, which begin in other parts of the body and spread to the brain, is not discussed in this summary. For information about the different types of brain and spinal cord tumors, see the PDQ summary on Childhood Brain and Spinal Cord Tumors Treatment Overview.

Brain tumors occur in both children and adults. Treatment for adults may be different from treatment for children. See the PDQ summary on Adult Central Nervous System Tumors Treatment for more information on the treatment of adults.

Some couples are almost desperate to conceive a baby of one particular gender. Fathers especially, can be eager to have a boy but there are also mothers who long for a son. Most couples however, are happy with either a boy or a girl baby, as long as it is healthy and strong. But if you are keen to try to sway the odds of having a boy then there is no harm in trying. Just remember that there are no guarantees and the odds of conceiving a boy or a girl are almost exactly the same for each and every pregnancy.

If you learn that you or your child has a type of spine and brain cancer called an ependymoma, there's a lot to take in. You'll have lots of questions about how to treat the disease and manage the swirl of emotions you may feel.

Depending on where the cancer is, your doctor may recommend surgery, chemotherapy, or radiation. But make sure you take care of your mental health, too. Turn to family, friends, and support groups to get the emotional backing you need.

Epidermoid (ep-ih-DUR-moid) cysts are noncancerous small bumps beneath the skin. They can appear anywhere on the skin, but are most common on the face, neck and trunk.

Epidermoid cysts are slow growing and often painless, so they rarely cause problems or need treatment. You might choose to have a cyst removed by a doctor if its appearance bothers you or if it's painful, ruptured or infected.

Many people refer to epidermoid cysts as sebaceous cysts, but they're different. True sebaceous cysts are less common. They arise from the glands that secrete oily matter that lubricates hair and skin (sebaceous glands).

Epidermolysis bullosa (ep-ih-dur-MOL-uh-sis buhl-LOE-sah) is a group of rare diseases that cause fragile, blistering skin. The blisters may appear in response to minor injury, even from heat, rubbing, scratching or adhesive tape. In severe cases, the blisters may occur inside the body, such as the lining of the mouth or the stomach.

Most types of epidermolysis bullosa are inherited. The condition usually shows up in infancy or early childhood. Some people don't develop signs and symptoms until adolescence or early adulthood.

Epidermolysis bullosa has no cure, though mild forms may improve with age. Treatment focuses on caring for blisters and preventing new ones.

Epididymitis (ep-ih-did-uh-MY-tis) is an inflammation of the coiled tube (epididymis) at the back of the testicle that stores and carries sperm. Males of any age can get epididymitis.

Epididymitis is most often caused by a bacterial infection, including sexually transmitted infections (STIs), such as gonorrhea or chlamydia. Sometimes, a testicle also becomes inflamed — a condition called epididymo-orchitis.

Eye floaters appear as small spots that drift through your field of vision. They may stand out when you look at something bright, like white paper or a blue sky. They might annoy you, but they shouldn’t interfere with your sight.

If you have a large floater, it can cast a slight shadow over your vision. But this tends to happen only in certain types of light.

You can learn to live with floaters and ignore them. You may notice them less as time passes. Only rarely do they get bad enough to require treatment.

The term eye strain is frequently used by people to describe a group of vague symptoms that are related to use of the eyes. Eye strain is a symptom, not an eye disease. Eye strain occurs when your eyes get tired from intense use, such as driving a car for extended periods, reading, or working at the computer. If you have any eye discomfort caused by looking at something for a long time, you can call it eye strain.

Although eye strain can be annoying, it usually is not serious and goes away once you rest your eyes. In some cases, signs and symptoms of eye strain are a sign of an underlying eye condition that needs treatment. Although you may not be able to change the nature of your job or all the factors that can cause eye strain, you can take steps to reduce eye strain.

Infertility is defined as trying to get pregnant (with frequent intercourse) for at least a year with no success. Female infertility, male infertility or a combination of the two affects millions of couples in the United States. An estimated 10 to 18 percent of couples have trouble getting pregnant or having a successful delivery.

Infertility results from female factors about one-third of the time and male factors about one-third of the time. The cause is either unknown or a combination of male and female factors in the remaining cases.

Female infertility causes can be difficult to diagnose. There are many available treatments, which will depend on the cause of infertility. Many infertile couples will go on to conceive a child without treatment. After trying to get pregnant for two years, about 95 percent of couples successfully conceive.

A sexual problem, or sexual dysfunction, refers to a problem during any phase of the sexual response cycle that prevents the individual or couple from experiencing satisfaction from the sexual activity. The sexual response cycle has four phases: excitement, plateau, orgasm, and resolution.

While research suggests that sexual dysfunction is common (43% of women and 31% of men report some degree of difficulty), it is a topic that many people are hesitant or embarrassed to discuss. Fortunately, most cases of sexual dysfunction are treatable, so it is important to share your concerns with your partner and doctor.

Fibrocystic breasts are composed of tissue that feels lumpy or rope-like in texture. Doctors call this nodular or glandular breast tissue.

It's not at all uncommon to have fibrocystic breasts. More than half of women experience fibrocystic breast changes at some point in their lives. In fact, medical professionals have stopped using the term "fibrocystic breast disease" and now simply refer to "fibrocystic breasts" or "fibrocystic breast changes" because having fibrocystic breasts isn't really a disease. Breast changes categorized as fibrocystic are considered normal.

Although many women with fibrocystic breasts don't have symptoms, some women experience breast pain, tenderness and lumpiness — especially in the upper, outer area of the breasts. Breast symptoms tend to be most bothersome just before menstruation. Simple self-care measures can usually relieve discomfort associated with fibrocystic breasts.

Fibromuscular dysplasia is a condition that causes narrowing (stenosis) and enlargement (aneurysm) of the medium-sized arteries in your body. Reduced blood flow from narrowed arteries to the organs can affect the function of the organs.

Fibromuscular dysplasia appears most commonly in the arteries leading to the kidneys. Fibromuscular dysplasia can also affect the arteries leading to your brain, heart, abdomen, arms and legs.

Fibromuscular dysplasia can cause a number of complications, such as high blood pressure or tears of the artery (arterial dissection), if left untreated. Arterial dissection, or spontaneous coronary artery dissection (SCAD), can limit blood flow to the organ supplied by the injured artery.

Fibrous dysplasia is an uncommon bone disorder in which scar-like (fibrous) tissue develops in place of normal bone. This irregular tissue can weaken the affected bone and cause it to deform or fracture.

In most cases, fibrous dysplasia occurs at a single site in one bone, but can occur at multiple sites in multiple bones. Single bone involvement usually occurs in adolescents and young adults. People who have more than one affected bone typically develop symptoms before the age of 10.

Although fibrous dysplasia is a genetic disorder, it's caused by a gene mutation that's not passed from parent to child. There's no cure for the disorder. Treatment, which may include surgery, focuses on relieving pain and repairing or stabilizing bones.

Ganglion cysts are noncancerous lumps that most commonly develop along the tendons or joints of your wrists or hands. They also may occur in the ankles and feet. Ganglion cysts are typically round or oval and are filled with a jellylike fluid.

Small ganglion cysts can be pea-sized, while larger ones can be around an inch (2.5 centimeters) in diameter. Ganglion cysts can be painful if they press on a nearby nerve. Their location can sometimes interfere with joint movement.

If your ganglion cyst is causing you problems, your doctor may suggest trying to drain the cyst with a needle. Removing the cyst surgically also is an option. But if you have no symptoms, no treatment is necessary. In many cases, the cysts go away on their own.

Coronary artery disease (CAD), also known as ischemic heart disease (IHD),[13] is a group of diseases that includes: stable angina, unstable angina, myocardial infarction, and sudden cardiac death.[14] It is within the group of cardiovascular diseases of which it is the most common type

Signs and symptoms[edit]

Chest pain that occurs regularly with activity, after eating, or at other predictable times is termed stable angina and is associated with narrowings of the arteries of the heart.

Angina that changes in intensity, character or frequency is termed unstable. Unstable angina may precede myocardial infarction. In adults who go to the emergency department with an unclear cause of pain, about 30% have pain due to coronary artery disease

How Does Coronary Artery Disease Develop?

From a young age, plaque can start to go into your blood vessel walls. As you get older, the plaque builds up. 

The hamstrings are the tendons that attach the large muscles at the back of the thigh to bone. The hamstring muscles are the large muscles that pull on these tendons. It has become common in layman's terminology (and by some medical personnel) to refer to the long muscles at the back of the thigh as the "hamstrings" or "hamstring muscles." Academic anatomists refer to them as the posterior thigh muscles, and more specifically as the semimembranosus, the semitendinosus, and the biceps femoris muscles. These muscles span the thigh, crossing both the hip and the knee. They originate or begin at just below the buttocks, arising from the bone on which we sit (the ischium). They connect by means of their tendons onto the upper parts of the lower leg bones (the tibia and the fibula).

The origin of the word hamstring comes from the old English hamm, meaning thigh. String refers to the characteristic appearance and feel of the tendons just above the back of the knee. Although the tendons are sometimes involved in injuries, this article will refer to the "hamstrings" as the large muscle group at the back of the thigh because the most frequent problems involve this muscle group.

Heart rhythm problems (heart arrhythmias) occur when the electrical impulses that coordinate your heartbeats don't work properly, causing your heart to beat too fast, too slow or irregularly.

Heart arrhythmias (uh-RITH-me-uhs) may feel like a fluttering or racing heart and may be harmless. However, some heart arrhythmias may cause bothersome — sometimes even life-threatening — signs and symptoms.

Heart arrhythmia treatment can often control or eliminate fast, slow or irregular heartbeats. In addition, because troublesome heart arrhythmias are often made worse — or are even caused — by a weak or damaged heart, you may be able to reduce your arrhythmia risk by adopting a heart-healthy lifestyle.

Hip dysplasia is the medical term for a hip socket that doesn't fully cover the ball portion of the upper thighbone. This allows the hip joint to become partially or completely dislocated. Most people with hip dysplasia are born with the condition.

Doctors will check your baby for signs of hip dysplasia shortly after birth and during well-baby visits. If hip dysplasia is diagnosed in early infancy, a soft brace can usually correct the problem.

If hip dysplasia is diagnosed after the age of 2, surgery may be necessary to move the bones into the proper positions for smooth joint movement.

Milder cases of hip dysplasia might not start causing symptoms until a person is a teenager or young adult. Hip dysplasia can damage the cartilage lining the joint, and it can also hurt the soft cartilage (labrum) that rims the socket portion of the hip joint. This is called a hip labral tear.

Horner syndrome is a combination of signs and symptoms caused by the disruption of a nerve pathway from the brain to the face and eye on one side of the body.

Typically, Horner syndrome results in a decreased pupil size, a drooping eyelid and decreased sweating on the affected side of your face.

Horner syndrome is the result of another medical problem, such as a stroke, tumor or spinal cord injury. In some cases, no underlying cause can be found. There's no specific treatment for Horner syndrome, but treatment for the underlying cause may restore normal nerve function.

Horner syndrome is also known as Horner-Bernard syndrome or oculosympathetic palsy.

Hunter syndrome is a very rare, inherited genetic disorder caused by a missing or malfunctioning enzyme. Because the body doesn't have enough of the enzyme to break down certain complex molecules, the molecules build up in harmful amounts.

In Hunter syndrome, the buildup of massive amounts of these harmful substances eventually causes permanent, progressive damage affecting appearance, mental development, organ function and physical abilities.

Hunter syndrome appears in children as young as 18 months. It mainly occurs in boys, although very rarely it has been observed in girls.

There's no cure for Hunter syndrome. Treatment of Hunter syndrome involves management of symptoms and complications.

A hydrocele is a sac filled with fluid that forms around a testicle. Hydroceles are most common in babies.

Nearly 10 percent of males are born with a hydrocele. However, they can affect males of any age.

Hydroceles generally don’t pose any threat to the testicles. They’re usually painless and disappear without treatment. However, if you have scrotal swelling, see your doctor to rule out other causes that are more harmful such as testicular cancer.

The term hydrocephalus is derived from the Greek words "hydro" meaning water and "cephalus" meaning head. As the name implies, it is a condition in which the primary characteristic is excessive accumulation of fluid in the brain. Although hydrocephalus was once known as "water on the brain," the "water" is actually cerebrospinal fluid (CSF)--a clear fluid that surrounds the brain and spinal cord. The excessive accumulation of CSF results in an abnormal widening of spaces in the brain called ventricles. This widening creates potentially harmful pressure on the tissues of the brain.

The ventricular system is made up of four ventricles connected by narrow passages.. Normally, CSF flows through the ventricles, exits into cisterns (closed spaces that serve as reservoirs) at the base of the brain, bathes the surfaces of the brain and spinal cord, and then reabsorbs into the bloodstream.

CSF has three important life-sustaining functions: 1) to keep the brain tissue buoyant, acting as a cushion or "shock absorber"; 2) to act as the vehicle for delivering nutrients to the brain and removing waste; and 3) to flow between the cranium and spine and compensate for changes in intracranial blood volume (the amount of blood within the brain).

The balance between production and absorption of CSF is critically important. Because CSF is made continuously, medical conditions that block its normal flow or absorption will result in an over-accumulation of CSF. The resulting pressure of the fluid against brain tissue is what causes hydrocephalus.

One of the most common causes of high calcium levels (hypercalcemia), is an overproduction of parathyroid hormone, or hyperparathyroidism.

Hyperparathyroidism tends to be more common in women over 50.

It can be the result of all four parathyroid glands producing too much PTH (parathyroid hyperplasia), or one gland specifically producing an excessive amount of hormone (usually the result of a parathyroid adenoma, or benign tumor).

Hypercalcemia can occur due to other medical conditions. These conditions can vary in severity and chronicity, and may be life-threatening. Malignancy is a common cause of elevated blood calcium. Up to 20% of individuals with cancer will develop hypercalcemia at some point in their disease.

Hypereosinophilic syndrome (HES) refers to a rare group of conditions that are associated with persistent eosinophilia with evidence of organ involvement. Signs and symptoms vary significantly based on which parts of the body are affected. Although any organ system can be involved in HES, the heart, central nervous system, skin, and respiratory tract are the most commonly affected. The condition was originally thought to be "idiopathic" or of unknown cause. However, recent advances in diagnostic testing have allowed a cause to be identified in approximately a quarter of cases. Management varies based on the severity of the condition and whether or not an underlying cause has been identified but generally includes imatinib or corticosteroids as an initial treatment.

High blood sugar (hyperglycemia) affects people who have diabetes. Several factors can contribute to hyperglycemia in people with diabetes, including food and physical activity choices, illness, nondiabetes medications, or skipping or not taking enough glucose-lowering medication.

It's important to treat hyperglycemia, because if left untreated, hyperglycemia can become severe and lead to serious complications requiring emergency care, such as a diabetic coma. In the long term, persistent hyperglycemia, even if not severe, can lead to complications affecting your eyes, kidneys, nerves and heart.

Hyperhidrosis, or excessive sweating, is a common disorder which produces a lot of unhappiness. An estimated 2%-3% of Americans suffer from excessive sweating of the underarms (axillary hyperhidrosis) or of the palms and soles of the feet (palmoplantar hyperhidrosis). Underarm problems tend to start in late adolescence, while palm and sole sweating often begins earlier, around age 13 (on the average). Untreated, these problems may continue throughout life.

Sweating is embarrassing, it stains clothes, ruins romance, and complicates business and social interactions. Severe cases can have serious practical consequences as well, making it hard for people who suffer from it to hold a pen, grip a car steering wheel, or shake hands.

Hyperparathyroidism is an excess of parathyroid hormone in the bloodstream due to overactivity of one or more of the body's four parathyroid glands. These glands are about the size of a grain of rice and are located in your neck.

The parathyroid glands produce parathyroid hormone, which helps maintain an appropriate balance of calcium in the bloodstream and in tissues that depend on calcium for proper functioning.

Two types of hyperparathyroidism exist. In primary hyperparathyroidism, an enlargement of one or more of the parathyroid glands causes overproduction of the hormone, resulting in high levels of calcium in the blood (hypercalcemia), which can cause a variety of health problems. Surgery is the most common treatment for primary hyperparathyroidism.

Secondary hyperparathyroidism occurs as a result of another disease that initially causes low levels of calcium in the body and over time, increased parathyroid hormone levels occur.

Hyponatremia is a condition that occurs when the level of sodium in your blood is abnormally low. Sodium is an electrolyte, and it helps regulate the amount of water that's in and around your cells.

In hyponatremia, one or more factors — ranging from an underlying medical condition to drinking too much water during endurance sports — causes the sodium in your body to become diluted. When this happens, your body's water levels rise, and your cells begin to swell. This swelling can cause many health problems, from mild to life-threatening.

Hyponatremia treatment is aimed at resolving the underlying condition. Depending on the cause of hyponatremia, you may simply need to cut back on how much you drink. In other cases of hyponatremia, you may need intravenous fluids and medications.

Hypoparathyroidism is an uncommon condition in which your body secretes abnormally low levels of parathyroid hormone (PTH). PTH is key to regulating and maintaining a balance of your body's levels of two minerals — calcium and phosphorus.

The low production of PTH in hypoparathyroidism leads to abnormally low calcium levels in your blood and bones and to an increase of phosphorus in your blood.

Supplements to normalize your calcium and phosphorus levels treat the condition. Depending on the cause of your hypoparathyroidism, you'll likely need to take supplements for life.

Hypopituitarism is a rare disorder in which your pituitary gland either fails to produce one or more of its hormones or doesn't produce enough of them.

The pituitary gland is a small bean-shaped gland situated at the base of your brain, behind your nose and between your ears. Despite its size, this gland secretes hormones that influence nearly every part of your body.

In hypopituitarism, you have a short supply of one or more of these pituitary hormones. This deficiency can affect any number of your body's routine functions, such as growth, blood pressure and reproduction.

You'll likely need medications for the rest of your life to treat hypopituitarism, but your symptoms can be controlled.

Hypospadias (hi-poe-SPAY-dee-us) is a birth defect (congenital condition) in which the opening of the urethra is on the underside of the penis instead of at the tip. The urethra is the tube through which urine drains from your bladder and exits your body.

Hypospadias is common and doesn't cause difficulty in caring for your infant. Surgery usually restores the normal appearance of your child's penis. With successful treatment of hypospadias, most males can have normal urination and reproduction.

Hypothermia is defined as a body temperature (core, or internal body temperature) of less than about 95 F (35 C). Usually, hypothermia occurs when the body's temperature regulation is overwhelmed by a cold environment. However, in the medical and lay literature there are essentially two major classifications, accidental hypothermia and intentional hypothermia.

Accidental hypothermia usually occurs from an exposure to cold that results in lowering the body temperature.

Intentional hypothermia is body temperature lowering induced usually for a medical procedure.

This article will focus on accidental hypothermia. Hypothermia is a medical emergency that, when quickly and appropriately treated, people can recover with little or no consequences.

Body temperature, when discussing hypothermia, is usually termed "core" temperature. This temperature is the temperature measured inside the body. It's a measurement that is most accurately done by a rectal thermometer, a rectal probe thermometer that has a constant temperature readout or by a bladder or esophageal temperature device. Temperatures taken by other methods may not adequately measure core temperature.

Ichthyosis (ick-thee-OH-sis) is a group of skin diseases that causes extremely dry, thick, and scaly skin. The skin often looks like it has fish scales.

There are more than 20 different types of ichthyosis. The most common type is ichthyosis vulgaris (vul-GAR-ris). About 95% of people who develop ichthyosis get this type.

The other types are rare and include harlequin ichthyosis, lamellar type, and x-linked ichthyosis.

Of all the types, ichthyosis vulgaris is the mildest. It often begins in childhood.

Jellyfish are a common sea creature found in every ocean. There are many species of jellyfish, all of them with tentacles. Some carry poisonous venom in their tentacles as a method of self-defense against predators. It’s this venom that makes a jellyfish sting so painful.

Most types of jellyfish stings will cause some discomfort, but some can be life-threatening. According to the National Science Foundation, over 500,000 people are stung by jellyfish every year in North America’s Chesapeake Bay alone.

Juvenile-onset fibromyalgia (JFM) is a poorly understood chronic pain condition most commonly affecting adolescent girls. The condition is characterized by widespread musculoskeletal pain and other associated symptoms, including fatigue, nonrestorative sleep, headaches, irritable bowel symptoms, dysautonomia and mood disorders such as anxiety and/or depression. In the past few years, there has been a greater focus on understanding JFM in adolescents. Research studies have provided insight into the clinical characteristics of this condition and its effect on both short-term and long-term psychosocial and physical functioning. The importance of early and effective intervention is being recognized, as research has shown that symptoms of JFM tend to persist and do not resolve over time as was previously believed. Efforts to improve treatments for JFM are underway, and new evidence strongly points to the potential benefits of cognitive–behavioural therapy on improving mood and daily functioning. Research into pharmacotherapy and other nonpharmacological options is in progress. Advancements in the understanding of adult fibromyalgia have paved the way for future studies on diagnosis, assessment and management of JFM. This Review focuses on our current knowledge of the condition, provides an update of the latest research advances, and highlights areas for further study.

Kidney cancer -- also called renal cancer -- is a disease in which kidney cells become malignant (cancerous) and grow out of control, forming a tumor. Almost all kidney cancers first appear in the lining of tiny tubes (tubules) in the kidney. This type of kidney cancer is called renal cell carcinoma. The good news is that most of kidney cancers are found before they spread (metastasize) to distant organs. And cancers caught early are easier to treat successfully. However, these tumors can grow to be quite large before they are detected.

The kidneys are two bean-shaped organs, each about the size of a fist. They lie in your lower abdomen on each side of your spine. Their main job is to clean your blood, removing waste products and making urine.

A simple kidney cyst is a round pouch of smooth, thin-walled tissue or a closed pocket that is usually filled with fluid. One or more may form within the kidneys. Simple cysts are the most common type of kidney cyst. They are not the same thing as polycystic kidney disease, which is a progressive disease that can lead to kidney failure. Simple kidney cysts most often do not cause harm.

The spine has a series of normal curves when viewed from the side. These curves help to better absorb the loads applied to the spine from the weight of the body. The cervical spine (neck) and lumbar spine (lower back) are have a normal inward curvature that is medically referred to as lordosisor "lordotic" curvature by which the spine is bent backward. The thoracic spine (upper back) has a normal outward curvature that is medically referred to as kyphosis or the "kyphotic" curve by which the spine is bent forward. In this discussion, the term kyphosis will be used to discuss abnormal kyphosis.

The spine is normally straight when looking from the front. An abnormal curve when viewed from the front is called scoliosis. Scoliosis can occur from bony abnormalities of the spine at birth, growth abnormalities especially with adolescence, degenerative spinal changes in adulthood, or abnormal twisting of the vertebrae because of muscle spasm after an injury.

The normal curves of the spine allow the head to be balanced directly over the pelvis. If one or more of these curves is either too great or too small, the head may not be properly balanced over the pelvis. This can lead to back pain, stiffness, and an altered gait or walking pattern.

Amblyopia, commonly known as lazy eye, is the eye condition noted by reduced vision not correctable by glasses or contact lenses and is not due to any eye disease. The brain, for some reason, does not fully acknowledge the images seen by the amblyopic eye. This almost always affects only one eye but may manifest with reduction of vision in both eyes. It is estimated that three percent of children under six have some form of amblyopia.

Leiomyosarcoma (LMS) is a type of soft tissue sarcoma. Soft tissue sarcomas can develop in muscle, fat, blood vessels, or any of the other tissues that support, surround and protect the organs of the body.

Leiomyosarcoma is one of the more common types of soft tissue sarcoma to develop in adults. We don’t yet know the exact cause.

Leiomyosarcomas are usually treated at a specialist hospital. The usual treatment for a leiomyosarcoma is surgery to remove the tumour. You may have radiotherapy after surgery, to reduce the chance of the cancer coming back. Chemotherapy is also sometimes used for a leiomyosarcomas that has come back, or that has spread.

You may be asked to take part in clinical trial looking at new ways of treating leiomyosarcomas. Your doctor or specialist nurse can talk to you about this.

After treatment, you will have regular check-ups. If you have any problems or notice any new symptoms between these check-ups, it’s important to let your doctor know as soon as possible

Lewy body dementia (LBD) is a progressive brain disorder in which Lewy bodies (abnormal deposits of a protein called alpha-synuclein) build up in areas of the brain that regulate behavior, cognition, and movement.

A complex disease, LBD can present with a range of symptoms including problems with thinking, memory, moving, sleep and/or changes in behavior, to name a few of the physical, cognitive, and behavioral symptoms.

LBD also affects autonomic body functions, such as blood pressure control, temperature regulation, and bladder and bowel function. Progressively debilitating, LBD can also cause people to experience visual hallucinations or act out their dreams.

Each strand of hair is made up of the medulla, cortex, and cuticle.[4] The innermost region, the medulla, is not always present and is an open, unstructured region.[5] The highly structural and organized cortex, or middle layer of the hair, is the primary source of mechanical strength and water uptake. The cortex contains melanin, which colors the fiber based on the number, distribution and types of melanin granules. The shape of the follicle determines the shape of the cortex, and the shape of the fiber is related to how straight or curly the hair is. People with straight hair have round hair fibers. Oval and other shaped fibers are generally more wavy or curly. The cuticle is the outer covering. Its complex structure slides as the hair swells and is covered with a single molecular layer of lipid that makes the hair repel water.[4] The diameter of human hair varies from 0.017 to 0.18 millimeters (0.00067 to 0.00709 in).[6] There are two million small, tubular glands and sweat glands that produce watery fluids that cool the body by evaporation. The glands at the opening of the hair produce a fatty secretion that lubricates the hair.[7]

Hair growth begins inside the hair follicle. The only "living" portion of the hair is found in the follicle. The hair that is visible is the hair shaft, which exhibits no biochemical activity and is considered "dead". The base of a hair's root (the "bulb") contains the cells that produce the hair shaft.[8] Other structures of the hair follicle include the oil producing sebaceous gland which lubricates the hair and the arrector pili muscles, which are responsible for causing hairs to stand up. In humans with little body hair, the effect results in goose bumps.

Long QT syndrome (LQTS) is a heart rhythm condition that can potentially cause fast, chaotic heartbeats. These rapid heartbeats might trigger a sudden fainting spell or seizure. In some cases, the heart can beat erratically for so long that it causes sudden death.

You can have a genetic mutation that puts you at risk of being born with congenital long QT syndrome. In addition, certain medications, imbalances of the body's salts and minerals (electrolyte abnormalities), and medical conditions might cause acquired long QT syndrome.

Long QT syndrome is treatable. You might need to take medications to prevent an erratic heart rhythm. In some cases, treatment for long QT syndrome involves surgery or an implantable device.

You'll also need to avoid certain medications that could trigger your long QT syndrome. After treatment, you likely can live and thrive, even with this condition. You may be able to continue being active in recreational — and even competitive — sports.

The lymphatic system is a network of specialized vessels (lymph vessels) throughout the body whose purpose is to collect excess lymph fluid with proteins, lipids, and waste products from the tissues. This fluid is then carried to the lymph nodes, which filter waste products and contain infection-fighting cells called lymphocytes. The excess fluid in the lymph vessels is eventually returned to the bloodstream. When the lymph vessels are blocked or unable to carry lymph fluid away from the tissues, localized swelling (lymphedema) is the result.

Lynch syndrome, often called hereditary nonpolyposis colorectal cancer (HNPCC), is an inherited disorder that increases the risk of many types of cancer, particularly cancers of the colon (large intestine) and rectum, which are collectively referred to as colorectal cancer. People with Lynch syndrome also have an increased risk of cancers of the stomach, small intestine, liver, gallbladder ducts, upper urinary tract, brain, and skin. Additionally, women with this disorder have a high risk of cancer of the ovaries and lining of the uterus (the endometrium). People with Lynch syndrome may occasionally have noncancerous (benign) growths (polyps) in the colon, called colon polyps. In individuals with this disorder, colon polyps occur earlier but not in greater numbers than they do in the general population.

Male hypogonadism is a condition in which the body doesn't produce enough testosterone — the hormone that plays a key role in masculine growth and development during puberty — or has an impaired ability to produce sperm orboth.You may be born with male hypogonadism, or it can develop later in life, often from injury or infection. The effects — and what you can do about them — depend on the cause and at what point in your life male hypogonadism occurs. Some types of male hypogonadism can be treated with testosterone replacement therapy.

Malignant hyperthermia is a condition that triggers a severe reaction to certain drugs used as part of anesthesia for surgery. Without prompt treatment, the disease can be fatal.The genes that cause malignant hyperthermia are inherited. In most cases, no signs or symptoms of the condition exist until you are exposed to anesthesia.

Mammary duct ectasia (ek-TAY-zhuh) occurs when a milk duct beneath your nipple widens, the duct walls thicken and the duct fills with fluid. The milk duct may become blocked or clogged with a thick, sticky substance. The condition often causes no symptoms, but some women may have nipple discharge, breast tenderness or inflammation of the clogged duct (periductal mastitis).

Mammary duct ectasia most often occurs in women of perimenopausal age — around 45 to 55 years — but it can happen after menopause, too. The condition sometimes improves without treatment. If symptoms persist, you may need antibiotics or possibly surgery to remove the affected milk duct.Though it's normal to worry about any changes in your breasts, mammary duct ectasia and periductal mastisis aren't risk factors for breast cancer

Cystic fibrosis is an inherited disorder that causes severe damage to the lungs, digestive system and other organs in the body.

Cystic fibrosis affects the cells that produce mucus, sweat and digestive juices. These secreted fluids are normally thin and slippery. But in people with cystic fibrosis, a defective gene causes the secretions to become sticky and thick. Instead of acting as a lubricant, the secretions plug up tubes, ducts and passageways, especially in the lungs and pancreas.

Although cystic fibrosis requires daily care, people with the condition are usually able to attend school and work, and often have a better quality of life than people with cystic fibrosis had in previous decades. Improvements in screening and treatments mean people with cystic fibrosis now may live into their mid- to late 30s, on average, and some are living into their 40s and 50s.

Membranous nephropathy (MEM-bruh-nus nuh-FROP-uh-thee) occurs when the small blood vessels in the kidney (glomeruli), which filter wastes from the blood, become damaged and thickened. As a result, proteins leak from the damaged blood vessels into the urine (proteinuria). For many, loss of these proteins eventually causes signs and symptoms known as nephrotic syndrome.In mild cases, membranous nephropathy may get better on its own, without any treatment. As protein leakage increases, so does the risk of long-term kidney damage. In many, the disease ultimately leads to kidney failure. There's no absolute cure for membranous nephropathy, but successful treatment can lead to remission of proteinuria and a good long-term outlook.

Lymphadenitis is a condition in which your lymph nodes become inflamed. When the condition affects the lymph nodes in the membrane that connects your bowel to the abdominal wall (mesentery), it's called mesenteric lymphadenitis (mez-un-TER-ik lim-fad-uh-NIE-tis).Mesenteric lymphadenitis, which is also called mesenteric adenitis, usually results from an intestinal infection. It mainly affects children and teens. This painful condition can mimic the warning signs of appendicitis. Unlike appendicitis, mesenteric lymphadenitis is seldom serious and usually clears up on its own

Microcephaly (my-kroh-SEF-uh-lee) is a rare neurological condition in which an infant's head is significantly smaller than the heads of other children of the same age and sex. Sometimes detected at birth, microcephaly usually is the result of the brain developing abnormally in the womb or not growing as it should after birth.Microcephaly can be caused by a variety of genetic and environmental factors. Children with microcephaly often have developmental issues. Generally there's no treatment for microcephaly, but early intervention with supportive therapies, such as speech and occupational therapies, may help enhance your child's development and improve quality of life.

Between 2 and 3 percent of children younger than 3 are allergic to milk. Although experts once believed that the vast majority of them would outgrow this allergy by the time they turned 3, recent studies contradict this theory. In one study, fewer than 20 percent of children had outgrown their allergy by age 4. Still, about 80 percent of children are likely to outgrow their milk allergy before they are 16.

• A molar pregnancy is the result of a genetic error during the fertilization process that leads to a growth of abnormal tissue within the uterus. Molar pregnancies rarely involve a developing embryo, and the growth of this material is rapid compared to normal fetal growth. It has the appearance of a large and random collection of grape-like cell clusters. There are two types of molar pregnancies, “complete,” and “partial.”
  

Mold allergies can be tough to outrun. The fungus can grow in your basement, in your bathroom, in the cabinet under your sink where a leak went undetected, in the pile of dead leaves in your backyard and in the field of uncut grass down the road.There are roughly 1,000 species of mold in the United States — many of which aren’t visible to the naked eye. As tiny mold spores become airborne, they can cause allergic reactions in people who have mold allergies.

Moyamoya disease is a rare, progressive cerebrovascular disorder caused by blocked arteries at the base of the brain in an area called the basal ganglia. The name “moyamoya” means “puff of smoke” in Japanese and describes the look of the tangle of tiny vessels formed to compensate for the blockage.  Moyamoya disease was first described in Japan in the 1960s and it has since been found in individuals in the other countries around the world; its incidence is higher in Asian countries than in Europe or North America. The disease primarily affects children, but it can also occur in adults. In children, the first symptom of Moyamoya disease is often stroke, or recurrent transient ischemic attacks (TIA, commonly referred to as “mini-strokes”), frequently accompanied by muscular weakness or paralysis affecting one side of the body, or seizures.  Adults may also experience these symptoms that arise from blocked arteries, but more often experience a hemorrhagic stroke due to bleeding into the brain from the abnormal brain vessels.  Individuals with this disorder may have disturbed consciousness, problems with speaking and understanding speech, sensory and cognitive impairments, involuntary movements, and vision problems. About one in 10 individuals with Moyamoya disease has a close relative who is also affected; in these cases researchers think that Moyamoya disease is the result of inherited genetic abnormalities. Studies that look for the abnormal gene(s) may help reveal the biomechanisms that cause the disorder.

Multiple myeloma is a cancer that forms in a type of white blood cell called a plasma cell. Plasma cells help you fight infections by making antibodies that recognize and attack germs.Multiple myeloma causes cancer cells to accumulate in the bone marrow, where they crowd out healthy blood cells. Rather than produce helpful antibodies, the cancer cells produce abnormal proteins that can cause complications.Treatment for multiple myeloma isn't always necessary for people who aren't experiencing any signs or symptoms. For people with multiple myeloma who require treatment, a number of treatments are available to help control the disease.

Myasthenia gravis (my-us-THEE-nee-uh GRAY-vis) is characterized by weakness and rapid fatigue of any of the muscles under your voluntary control.Myasthenia gravis is caused by a breakdown in the normal communication between nerves and muscles.There is no cure for myasthenia gravis, but treatment can help relieve signs and symptoms, such as weakness of arm or leg muscles, double vision, drooping eyelids, and difficulties with speech, chewing, swallowing and breathing.Though myasthenia gravis can affect people of any age, it's more common in women younger than 40 and in men older than 60.

Myelodysplastic syndromes are a group of disorders caused by poorly formed blood cells or ones that don't work properly. Myelodysplastic syndromes result from something amiss in the spongy material inside your bones where blood cells are made (bone marrow).Treatment for myelodysplastic syndromes usually focuses on reducing or preventing complications of the disease and its treatments. In some cases, treatment might involve chemotherapy or a bone marrow transplant.

Myelofibrosis is a serious bone marrow disorder that disrupts your body's normal production of blood cells. The result is extensive scarring in your bone marrow, leading to severe anemia, weakness, fatigue and often an enlarged spleen.Myelofibrosis is an uncommon type of chronic leukemia — a cancer that affects the blood-forming tissues in the body. Myelofibrosis belongs to a group of diseases called myeloproliferative disorders.Many people with myelofibrosis get progressively worse, and some may eventually develop a more serious form of leukemia. Yet it's also possible to have myelofibrosis and live symptom-free for years. Treatment for myelofibrosis, which focuses on relieving symptoms, can involve a variety of options.

Myocardial ischemia occurs when blood flow to your heart is reduced, preventing it from receiving enough oxygen. The reduced blood flow is usually the result of a partial or complete blockage of your heart's arteries (coronary arteries).Myocardial ischemia, also called cardiac ischemia, can damage your heart muscle, reducing its ability to pump efficiently. A sudden, severe blockage of a coronary artery can lead to a heart attack. Myocardial ischemia might also cause serious abnormal heart rhythms.Treatment for myocardial ischemia involves improving blood flow to the heart muscle. Treatment may include medications, a procedure to open blocked arteries or bypass surgery.Making heart-healthy lifestyle choices is important in treating and preventing myocardial ischemia.

Myocarditis is a disease marked by inflammation and damage of the heart muscle. Although the exact incidence of myocarditis is not known, it is estimated that several thousand patients per year are diagnosed in the United States. Myocarditis usually attacks otherwise healthy people. It is believed that 5 to 20% of all cases of sudden death in young adults are due to myocarditis.There are many causes of myocarditis, including viral infections, autoimmune diseases, environmental toxins, and adverse reactions to medications. The prognosis is variable but chronic heart failure is the major long term complication. Myocarditis and the associated disorder of idiopathic dilated cardiomyopathy are the cause of approximately 45% of heart transplants in the United States.Subscribe to the Myocarditis Foundation Newsletter to receive the latest news and real-life stories delivered right to your email inbox!

Myoclonus refers to a sudden, brief, and involuntary muscle jerk. Healthy people can have myoclonus in the form of hiccups and “sleep starts”, which are the sudden jerky sensations that can occur as people fall asleep. Myoclonus can also occur due to underlying neurological disorders such as epilepsy, metabolic conditions, or adverse reactions to medications. Importantly, myoclonus is a symptom, not a diagnosis of a disease.Sudden positive muscle contractions are called positive myoclonus, whereas muscle relaxation is called negative myoclonus. Myoclonus can vary in frequency, and can occur alone or in a sequence. There are several underlying conditions that can give rise to myoclonus symptoms. Doctors aim to isolate and treat the underlying cause of myoclonus symptoms. When the underlying cause cannot be treated or cured, the aim of treatment is to alleviate severe myoclonus

Myofascial pain syndrome (MPS) refers to pain and presumed inflammation in the body's soft tissues or muscles. Myofascial pain is a chronic, painful condition that affects the fascia (connective tissue that covers the muscles). Myofascial pain syndrome might involve either a single muscle or a muscle group. In some cases, the area where a person experiences the pain might not be where the myofascial pain generator is located. Experts believe that the actual site of the injury or the strain prompts the development of a trigger point that, in turn, causes pain in other areas. This situation is known as referred pain.

Myxofibrosarcoma is a common connective tissue neoplasm of malignant fibrocytes in a myxoid matrix favoring the extremities. Like many other tumors of connective tissue, soft tissue sarcoma exhibits high recurrence rates but is rarely known to metastasize. We present a patient with myxofibrosarcoma of the hand with metastases to the lungs, pleura, and mediastinum. The mediastinal metastasis presented clinically with gastrointestinal symptoms due to compression of the gastroesophageal junction. To our knowledge, this is the first report of metastatic myxofibrosarcoma of the hand and also the first report of metastatic myxofibrosarcoma to mediastinal lymph nodes at the level of the gastroesophageal junction. We also performed a comprehensive literature review of metastatic myxofibrosarcoma.

Nasal polyps are soft, painless, noncancerous growths on the lining of your nasal passages or sinuses. They hang down like teardrops or grapes. They result from chronic inflammation due to asthma, recurring infection, allergies, drug sensitivity or certain immune disorders.Small nasal polyps may not cause symptoms. Larger growths or groups of nasal polyps can block your nasal passages or lead to breathing problems, a lost sense of smell and frequent infections.Nasal polyps can affect anyone, but they're more common in adults. Medications can often shrink or eliminate nasal polyps, but surgery is sometimes needed to remove them. Even after successful treatment, nasal polyps often return.

Even some of the most stunning women often have to resort to concealers and make-up to hide their dark circles. Not only do these under-eye circles make you look much older than what you actually are, but they also have you looking ill or unhealthy.Before we even begin this natural journey, let me tell you that dark circles take time to cure and require great discipline. A regular skin and health care program should be followed, by the book, so do not expect magic to happen overnight.

Nasopharyngeal (nay-zoh-fuh-RIN-jee-ul) carcinoma is cancer that occurs in the nasopharynx, which is located behind your nose and above the back of your throat.Nasopharyngeal carcinoma is rare in the United States. In other parts of the world — specifically Southeast Asia — nasopharyngeal carcinoma occurs much more frequently.Nasopharyngeal carcinoma is difficult to detect early. That's probably because the nasopharynx isn't easy to examine and symptoms of nasopharyngeal carcinoma mimic those of other, more-common conditions.Treatment for nasopharyngeal carcinoma usually involves radiation therapy, chemotherapy or a combination of the two. You can work with your doctor to determine the exact approach depending on your particular situation

Nephrotic syndrome is a kidney disorder that causes your body to excrete too much protein in your urine.Nephrotic syndrome is usually caused by damage to the clusters of small blood vessels in your kidneys that filter waste and excess water from your blood. Nephrotic syndrome causes swelling (edema), particularly in your feet and ankles, and increases the risk of other health problems.Treatment for nephrotic syndrome includes treating the underlying condition that's causing it and taking medications. Nephrotic syndrome can increase your risk of infections and blood clots. Your doctor may recommend medications and dietary changes to prevent these and other complications of nephrotic syndrome.

Your doctor can usually diagnose nickel allergy based on your skin's appearance, and a recent exposure to items that may contain nickel.If the cause of your rash isn't apparent, however, your doctor may recommend a patch test (contact hypersensitivity allergy test). He or she may refer you to an allergy specialist (allergist) or a skin specialist (dermatologist) for this test.

Noonan syndrome is a genetic disorder that prevents normal development in various parts of the body. A person can be affected by Noonan syndrome in a wide variety of ways. These include unusual facial characteristics, short stature, heart defects, other physical problems and possible developmental delays.Noonan syndrome is caused by a genetic mutation and is acquired when a child inherits a copy of an affected gene from a parent (dominant inheritance). It can also occur as a spontaneous mutation, meaning there's no family history involved.Management of Noonan syndrome focuses on controlling the disorder's symptoms and complications. Growth hormone may be used to treat short stature in some people with Noonan syndrome.

Osteomyelitis is an infection of the bone, a rare but serious condition. Bones can become infected in a number of ways: Infection in one part of the body may spread through the bloodstream into the bone, or an open fracture or surgery may expose the bone to infection.

Pancreatic cysts are collections (pools) of fluid that can form within the head, body, and tail of the pancreas. Some pancreatic cysts are true cysts (non-inflammatory cysts), that is, they are lined by a special layer of cells that are responsible for secreting fluid into the cysts. Other cysts are pseudocysts (inflammatory cysts) and do not contain specialized lining cells. Often these pseudocysts contain pancreatic digestive juices because they are connected to the pancreatic ducts. Pancreatic cysts can range in size from several millimeters to several centimeters. Many pancreatic cysts are small and benign and produce no symptoms, but some cysts become large and cause symptoms, and others are cancerous or precancerous. (Precancerous cysts are benign cysts that have the potential to become cancerous.)Different types of cysts contain different types of fluids. For example, pseudocysts that form after an attack of acute pancreatitis contain digestive enzymes such as amylase in high concentrations. Mucinous cysts contain mucus (a proteinaceous liquid) produced by the mucinous cells that form the inside lining of the cyst.

Many schools have declared that they are “nut-free,” meaning that the onetime staple of kids’ lunchboxes — a peanut butter and jelly sandwich — is nowhere to be found on school grounds these days. That’s because peanuts can cause a life-threatening reaction in some people. Peanuts are one of the food allergens most commonly associated with anaphylaxis, a sudden and potentially deadly condition that requires immediate attention and treatment.In recent years, awareness about peanut allergy in children has risen, as has the number of peanut allergy cases reported. In May 2010, a study noted that the rate of peanut allergies in children, as reported in a telephone survey, had more than tripled between 1997 and 2008.There are several misconceptions about peanut allergies. A peanut is a legume (belonging to the same family as soybeans, peas and lentils), not a tree nut. And while it was previously believed that an allergy to peanuts was lifelong, research by the National Institutes of Health shows that about 20 percent of individuals with a peanut allergy eventually outgrow it.

Penicillin allergy is an abnormal reaction of your immune system to the antibiotic drug penicillin. Penicillin is prescribed for treating various bacterial infections.

Common signs and symptoms of penicillin allergy include hives, rash and itching. Severe reactions include anaphylaxis, a life-threatening condition that affects multiple body systems.

Research has shown that penicillin allergies may be over-reported — a problem that can result in the use of less appropriate and more expensive antibiotic treatments. Therefore, an accurate diagnosis is needed when penicillin allergy is suspected to ensure the best treatment options in the future.

Other antibiotics, particularly those with chemical properties similar to penicillin, can also result in allergic reactions.

Peripheral artery disease (also called peripheral arterial disease) is a common circulatory problem in which narrowed arteries reduce blood flow to your limbs.When you develop peripheral artery disease (PAD), your extremities — usually your legs — don't receive enough blood flow to keep up with demand. This causes symptoms, most notably leg pain when walking (claudication).Peripheral artery disease is also likely to be a sign of a more widespread accumulation of fatty deposits in your arteries (atherosclerosis). This condition may be reducing blood flow to your heart and brain, as well as your legs.You often can successfully treat peripheral artery disease by quitting tobacco, exercising and eating a healthy diet

Peripheral neuropathy, a result of damage to your peripheral nerves, often causes weakness, numbness and pain, usually in your hands and feet. It can also affect other areas of your body.

Your peripheral nervous system sends information from your brain and spinal cord (central nervous system) to the rest of your body. Peripheral neuropathy can result from traumatic injuries, infections, metabolic problems, inherited causes and exposure to toxins. One of the most common causes is diabetes mellitus.

People with peripheral neuropathy generally describe the pain as stabbing, burning or tingling. In many cases, symptoms improve, especially if caused by a treatable condition. Medications can reduce the pain of peripheral neuropathy.

Personality is the way of thinking, feeling and behaving that makes a person different from other people. An individual’s personality is influenced by experiences, environment (surroundings, life situations) and inherited characteristics. A personality disorder is a way of thinking, feeling and behaving that deviates from the expectations of the culture, causes distress or problems functioning, and lasts over time.1There are 10 specific types of personality disorders (such as borderline personality disorder). Common to all personality disorders is a long-term pattern of behavior and inner experience that differs significantly from what is expected. The pattern of experience and behavior begins by late adolescence or early adulthood, and causes distress or problems in functioning. Without treatment, the behavior and experience is inflexible and usually long-lasting. The pattern is seen in at least two of these areas:

If your nose runs and your eyes water or you start sneezing and wheezing after petting or playing with a cat, you likely have a cat allergy. A cat allergy can contribute to constant allergy symptoms, as exposure can occur at work, school, day care or in other indoor environments, even if a cat is not present.

Cats produce multiple allergens (proteins that can cause allergy). These allergens are found on the fur and skin and in saliva. All cats produce allergens; studies have not shown that cats can be hypoallergenic (meaning that they don’t cause allergy). Homes with more than one cat have higher levels of cat allergens. Characteristics such as the length of a cat’s hair, its sex and the amount of time a cat spends indoors are not associated with cat allergen levels.Dust and pollen in a cat’s coat can also cause allergy symptoms. In those cases, the allergy is to the dust or pollen, not to the cat.

Excessive loss of body water. Diseases of the gastrointestinal tract that cause vomiting or diarrhea may lead to dehydration. There are a number of other causes of dehydration including heat exposure, prolonged vigorous exercise, kidney disease, and medications that cause voiding (diuretics).

One clue to dehydration is a rapid drop in weight. A loss of over 10% (15 pounds in a person weighing 150 pounds) is considered severe.

Peyronie's Disease is an inflammatory, benign condition that may cause a curvature, deformity or shortening of the erect penis. This process is produced by scar formation in the fibrous covering of the erectile bodies of the penis. Men may or may not feel tenderness, a lump, or an area of scarring {plaque) in the shaft of the penis. Occasionally, this condition is also associated with pain, and, in some cases, erections and stress on the penis can exacerbate the pain. Many patients with Peyronie's disease suffer psychological trauma, may experience difficulty with sexual intercourse, and may also suffer from erectile dysfunction. Those who suffer from erectile dysfunction, however, may not notice these symptoms. Peyronie's disease occurs more often in men between the ages of 50 and 70, although younger men are not immune. Its' accurate incidence is unknown, but it is not rare. Studies show that about three percent of men over the age of 40 have scar tissue in their penis labeled as Peyronie's disease. However, only a minority of these men have significant enough scarring, curvature, erectile dysfunction, or penile shortening to require medical attention.

Phenylketonuria (commonly known as PKU) is an inherited disorder that increases the levels of a substance called phenylalanine in the blood. Phenylalanine is a building block of proteins (an amino acid) that is obtained through the diet. It is found in all proteins and in some artificial sweeteners. If PKU is not treated, phenylalanine can build up to harmful levels in the body, causing intellectual disability and other serious health problems.The signs and symptoms of PKU vary from mild to severe. The most severe form of this disorder is known as classic PKU. Infants with classic PKU appear normal until they are a few months old. Without treatment, these children develop permanent intellectual disability. Seizures, delayed development, behavioral problems, and psychiatric disorders are also common. Untreated individuals may have a musty or mouse-like odor as a side effect of excess phenylalanine in the body. Children with classic PKU tend to have lighter skin and hair than unaffected family members and are also likely to have skin disorders such as eczema.

Less severe forms of this condition, sometimes called variant PKU and non-PKU hyperphenylalaninemia, have a smaller risk of brain damage. People with very mild cases may not require treatment with a low-phenylalanine diet.Babies born to mothers who have PKU and uncontrolled phenylalanine levels (women who no longer follow a low-phenylalanine diet) have a significant risk of intellectual disability because they are exposed to very high levels of phenylalanine before birth. These infants may also have a low birth weight and grow more slowly than other children. Other characteristic medical problems include heart defects or other heart problems, an abnormally small head size (microcephaly), and behavioral problems. Women with PKU and uncontrolled phenylalanine levels also have an increased risk of pregnancy loss.

Pheochromocytoma (PCC) is the term used for a rare tumor that has grown in the adrenal glands. These tumors are usually benign, meaning they are not cancerous. Most cases involve only one adrenal gland, but it is possible for both to be involved.In rare cases, PCC can be cancerous. These malignant tumors will spread like other cancers and can cause serious complications.The condition causes the adrenal glands to pump out too much adrenaline and noradrenaline. These two hormones help keep the heart rate, blood pressure, and stress response in balance. They are also responsible for the body's "fight or flight" response.When the body contains too much of these compounds at one time, it goes into a reactive state as if it were in a constant state of high stress.PCC will always form on the inside of the adrenal glands. They are often grouped together with similar tumors called paragangliomas, which are tumors that grow on the outside of the glands. The tumors are different, but both alter the production of the adrenal glands

A pilonidal (pie-low-NIE-dul) cyst is an abnormal pocket in the skin that usually contains hair and skin debris. A pilonidal cyst is almost always located near the tailbone at the top of the cleft of the buttocks.Pilonidal cysts usually occur when hair punctures the skin and then becomes embedded. If a pilonidal cyst becomes infected, the resulting abscess is often extremely painful. The cyst can be drained through a small incision or removed surgically.Pilonidal cysts most commonly occur in young men, and the problem has a tendency to recur. People who sit for prolonged periods of time, such as truck drivers, are at higher risk of developing a pilonidal cyst.

Pink eye (conjunctivitis) is an inflammation or infection of the transparent membrane (conjunctiva) that lines your eyelid and covers the white part of your eyeball. When small blood vessels in the conjunctiva become inflamed, they're more visible. This is what causes the whites of your eyes to appear reddish or pink.

Pink eye is commonly caused by a bacterial or viral infection, an allergic reaction, or — in babies — an incompletely opened tear duct.Though pink eye can be irritating, it rarely affects your vision. Treatments can help ease the discomfort of pink eye. Because pink eye can be contagious, early diagnosis and treatment can help limit its spread.

Pituitary tumors are abnormal growths that develop in your pituitary gland. Some pituitary tumors result in too many of the hormones that regulate important functions of your body. Some pituitary tumors can cause your pituitary gland to produce lower levels of hormones.Most pituitary tumors are noncancerous (benign) growths (adenomas). Adenomas remain in your pituitary gland or surrounding tissues and don't spread to other parts of your body.There are various options for treating pituitary tumors, including removing the tumor, controlling its growth and managing your hormone levels with medications. Your doctor may recommend observation — or a ''wait and see'' approach.

Pityriasis rosea is a rash that usually begins as a large circular or oval spot on your chest, abdomen or back. Called a herald patch, this spot can be up to 4 inches (10 centimeters) across.The herald patch is typically followed by smaller spots that sweep out from the middle of your body in a shape that resembles drooping pine-tree branches.Pityriasis (pit-ih-RIE-uh-sis) rosea can affect any age group. It most commonly occurs between the ages of 10 and 35. It usually goes away on its own within 10 weeks. Pityriasis rosea can cause itching. Treatment may help relieve the symptoms.

When you breathe, the thin tissues that line your lungs and chest wall, called the pleura, rub together. Typically this isn’t a problem, because the tissue is satiny and generates no friction. However, when this tissue is inflamed or infected, it becomes irritated and swollen, causing significant pain. This condition is known as pleurisy or pleuritis.This condition has a grim fame. It caused the death of a number of historical figures, including Catherine de Medici and Benjamin Franklin.Pleurisy is no longer a common condition. Over the years, antibiotics have been extremely successful in treating and preventing the bacterial infections that historically were the main causes of pleurisy. Nowadays, most cases of pleurisy are the result of a viral infection and deaths from this illness are quite rare.

POEMS syndrome is associated with a group of disorders known as monoclonal gammopathies or plasma cell dyscrasias. These disorders are characterized the uncontrolled growth of a single clone (monoclonal) of plasma cells, which results in the abnormal accumulation of M-proteins (also known as immunoglobulins) in the blood. Immunoglobulins in health fight infection. However, the specific role M-proteins play and the exact cause of POEMS syndrome is unknown. Research would suggest that a chemical called VEGF (vascular endothelial growth factor) plays an important role in this disease.

oison ivy rash is caused by contact with poison ivy, a plant that’s found on four continents. The sap of the poison ivy plant contains an oil called urushiol. This is the irritant that causes an allergic reaction and rash.

You don’t even have to come in direct contact with the plant to have a reaction. The oil can linger on your gardening equipment, golf clubs, or even your shoes. Brushing against the plant — or anything that’s touched it — can result in skin irritation, pain, and itching.

Here’s how to spot the danger, and what you can do if poison ivy gets too close.

Polycythemia vera (pol-e-sy-THEE-me-uh VEER-uh) is a slow-growing blood cancer in which your bone marrow makes too many red blood cells. These excess cells thicken your blood, slowing its flow. They also cause complications, such as blood clots, which can lead to a heart attack or stroke.

Polycythemia vera isn't common. It usually develops slowly, and you might have it for years without knowing. Often the condition is found during a blood test done for another reason.

Without treatment, polycythemia vera can be life-threatening. But proper medical care can help ease signs, symptoms and complications of this disease. Over time, in some cases there's a risk of progressing to more-serious blood cancers, such as myelofibrosis or acute leukemia.

Polyhydramnios is where there is too much amniotic fluid around the baby during pregnancy. Amniotic fluid is the fluid that surrounds your baby in the womb.

Too much amniotic fluid is normally spotted during a check-up in the later stages of pregnancy.

It isn't usually a sign of anything serious, but you'll probably have some extra check-ups and will be advised to give birth in hospital.

Polymyalgia rheumatica (sometimes referred to as PMR) is a common cause of widespread aching and stiffness that affects adults over the age of 50, especially Caucasians. Because polymyalgia rheumatica does not often cause swollen joints, it may be hard to recognize. It may occur with another health problem, giant cell arteritis.

The average age when symptoms start is 70, so people who have PMR may be in their 80s or even older. The disease affects women somewhat more often than men. It is more frequent in whites than nonwhites, but all races can get PMR.

Polymyositis is a disease of muscle featuring inflammation of the muscle fibers. The cause of the disease is not known. It begins when white blood cells, the immune cells of inflammation, spontaneously invade muscles. The muscles affected are typically those closest to the trunk or torso. This results in weakness that can be severe. Polymyositis is a chronic illness featuring progressive muscle weakness with periods of increased symptoms, called flares or relapses, and minimal or no symptoms, known as remissions.

Polymyositis is slightly more common in females. It affects all age groups, although its onset is most common in middle childhood and in the 20s. Polymyositis occurs throughout the world. Polymyositis can be associated with a characteristic skin rash and is then referred to as "dermatomyositis." Dermatomyositis in children is referred to as juvenile dermatomyositis. "Amyopathic dermatomyositis" is the term used to describe people who have skin changes compatible with dermatomyositis but do not have diseased muscle involvement.

Polymyositis can also affect other areas of the body and is, therefore, referred to as a systemic illness. Occasionally, it is associated with cancer or with other diseases of connective tissue (such as systemic lupus erythematosus, scleroderma, and rheumatoid arthritis). Depending on which other diseases it is associated with, it may be referred to as an "overlap syndrome" or "mixed connective tissue disease."

Porphyria is a group of disorders that can cause nerve or skin problems.

A porphyria that affects the skin is called cutaneous porphyria. A porphyria that affects the nervous system is called acute porphyria.

The most common type of porphyria is porphyria cutanea tarda (PCT), which affects the skin. PCT is also the most treatable.

No known cure exists for any type of porphyria.

Postpartum thyroiditis is an exacerbation of an underlying autoimmune thyroiditis, aggravated by the immunological rebound that follows the partial immunosuppression of pregnancy (1–3). Women who express human leukocyte antigen haplotypes DR-3, DR-4, and DR-5 have an increased risk for postpartum thyroiditis. In women who develop postpartum thyroiditis, CD4+/CD8+ and CD4 + 2H4+ ratios are elevated throughout pregnancy and the postpartum (4). Histologically, thyroid aspirates reveal either a lymphocytic infiltrate or diffuse destruction, changes similar to those seen in both Hashimoto’s thyroiditis (2, 3, 5) and painless sporadic silent thyroiditis (6). In essence, the immunological rebound that follows the end of pregnancy precipitates the clinical expression of Hashimoto’s disease, which before pregnancy was clinically silent

The literature lacks consensus regarding the nomenclature applicable to the development of new health problems in persons who previously had acute paralytic poliomyelitis, with frequently used terms including "late effects of polio" (LEoP), "postpolio syndrome" (PPS) and "postpolio muscular atrophy." PPS is typically characterized as a sub-category of LEoP. [1]

PPS is a neurologic disorder characterized by new and progressive muscular weakness, pain, and fatigue many years after the acute paralytic polio. Halstead introduced the term "post-polio syndrome" in 1986, and he published revised criteria for diagnosing PPS in 1991, in which new muscle weakness was introduced as an obligatory criterion.

People with Prader-Willi syndrome typically have mild to moderate intellectual impairment and learning disabilities. Behavioral problems are common, including temper outbursts, stubbornness, and compulsive behavior such as picking at the skin. Sleep abnormalities can also occur. Additional features of this condition include distinctive facial features such as a narrow forehead, almond-shaped eyes, and a triangular mouth; short stature; and small hands and feet. Some people with Prader-Willi syndrome have unusually fair skin and light-colored hair. Both affected males and affected females have underdeveloped genitals. Puberty is delayed or incomplete, and most affected individuals are unable to have children (infertile).

Precocious puberty is when a child's body begins changing into that of an adult (puberty) too soon. Puberty that begins before age 8 in girls and before age 9 in boys is considered precocious puberty.

Puberty includes rapid growth of bones and muscles, changes in body shape and size, and development of the body's ability to reproduce.

The cause of precocious puberty often can't be found. Rarely, certain conditions, such as infections, hormone disorders, tumors, brain abnormalities or injuries, may cause precocious puberty. Treatment for precocious puberty typically includes medication to delay further development.

Slightly elevated blood pressure is known as prehypertension. Prehypertension will likely turn into high blood pressure (hypertension) unless you make lifestyle changes, such as getting more exercise and eating healthier foods. Both prehypertension and high blood pressure increase your risk of heart attack, stroke and heart failure.

A blood pressure reading has two numbers. The first, or upper, number measures the pressure in your arteries when your heart beats (systolic pressure). The second, or lower, number measures the pressure in your arteries between beats (diastolic pressure). Prehypertension is a systolic pressure from 120 to 139 millimeters of mercury (mm Hg) or a diastolic pressure from 80 to 89 mm Hg.

Weight loss, exercise and other healthy lifestyle changes can often control prehypertension, and set the stage for a lifetime of better health.

Presbyopia is when your eyes gradually lose the ability to see things clearly up close. It is a normal part of aging. In fact, the word “presbyopia” means “old eye” in Greek. You may start to notice presbyopia shortly after age 40. You will probably find that you hold reading materials farther away in order to see them clearly.

When your child has a primary immunodeficiency disease (PIDD), his body has a harder time fighting germs that make people sick. He may get a lot of infections in his ears, lungs, skin, or other areas that take a long time to go away.

Most cases happen in babies or young children, but sometimes it doesn't show up until adulthood. There are many different types -- more than 200 -- and they affect different parts of the immune system. All make it more likely that he'll get sick from infections.

Everyone with a PIDD has a different experience. If your child has it, in most cases he'll be able to go to school and make friends like other kids. As an adult with a PIDD, he'll be able to work and have an active, normal life.

If your child's PIDD is mild, he may need to take medicines to treat the infections he gets.

Doctors treat some of the more serious types of PIDD with doses of antibodies to fight infections. He'll get these antibodies through an IV in his veins. The treatment takes several hours, and he'll need one every few weeks.

Pulmonary atresia is a form of heart disease in which the pulmonary valve does not form properly. It is present from birth (congenital heart disease). The pulmonary valve is an opening on the right side of the heart that regulates blood flow from the right ventricle (right side pumping chamber) to the lungs.

In pulmonary atresia, a solid sheet of tissue forms where the valve opening should be, and the valve stays closed. Because of this defect, blood from the right side of the heart cannot go to the lungs to pick up oxygen.

Edema, in general, means swelling. This typically occurs when fluid from inside blood vessels seeps outside the blood vessel into the surrounding tissues, causing swelling. This can happen either because of too much pressure in the blood vessels or not enough proteins in the bloodstream to hold on to the fluid in the plasma (the part of the blood that does not contain any blood cells).

Pulmonary edema is the term used when edema happens in the lungs. The immediate area outside of the small blood vessels in the lungs is occupied by very tiny air sacs called the alveoli. This is where oxygen from the air is picked up by the blood passing by, and carbon dioxide in the blood is passed into the alveoli to be exhaled out. Alveoli normally have a thin wall that allows for this air exchange, and fluids are usually kept out of the alveoli unless these walls lose their integrity.

Pulmonary embolism is a blockage in one of the pulmonary arteries in your lungs. In most cases, pulmonary embolism is caused by blood clots that travel to the lungs from the legs or, rarely, other parts of the body (deep vein thrombosis).

Because the clots block blood flow to the lungs, pulmonary embolism can be life-threatening. However, prompt treatment greatly reduces the risk of death. Taking measures to prevent blood clots in your legs will help protect you against pulmonary embolism.

The pulmonic valve is one of two valves that allow blood to leave the heart via the arteries. It is a one-way valve, meaning that blood cannot flow back into the heart through it. The valve is opened by the increased blood pressure of the ventricular systole (contraction of the muscular tissue), pushing blood out of the heart and into the artery. It closes when the pressure drops inside the heart. It is located in the right ventricle of the heart. The pulmonic valve opens into the pulmonary artery. The frequency of this cycle depends upon the heart rate. Pulmonary stenosis is a condition where the blood flow out of the heart is obstructed at the pulmonic valve. The most common cause of this is congenital heart disease, although rheumatic heart disease and a malignant carcinoid tumor can also initiate the problem. The condition is treated by surgical repair or replacement of the pulmonic valve.

Pulmonary valve stenosis is a condition in which a deformity on or near your pulmonary valve narrows the pulmonary valve opening and slows the blood flow. The pulmonary valve is located between the lower right heart chamber (right ventricle) and the pulmonary arteries. Adults occasionally have pulmonary valve stenosis as a complication of another illness, but mostly, pulmonary valve stenosis develops before birth as a congenital heart defect.

Pulmonary valve stenosis ranges from mild and without symptoms to severe. Mild pulmonary stenosis doesn't usually worsen over time, but moderate and severe cases may worsen and require surgery. Fortunately, treatment is generally highly successful, and most people with pulmonary valve stenosis can expect to lead normal lives.

Pyloric stenosis is an uncommon condition in infants that blocks food from entering the small intestine.Normally, a muscular valve (pylorus) between the stomach and small intestine holds food in the stomach until it is ready for the next stage in the digestive process. In pyloric stenosis, the pylorus muscles thicken and become abnormally large, blocking food from reaching the small intestine.Pyloric stenosis can lead to forceful vomiting, dehydration and weight loss. Babies with pyloric stenosis may seem to be hungry all the time.

Pyoderma gangrenosum is an uncommon, ulcerative cutaneous condition of uncertain etiology. It is associated with systemic diseases in at least 50% of patients who are affected. [1, 2] The diagnosis is made by excluding other causes of similar-appearing cutaneous ulcerations, including infection, malignancy, vasculitis, collagen vascular diseases, diabetes, and trauma. In a process termed pathergy, new ulcerations may occur after trauma or injury to the skin in 30% of patients who already have pyoderma gangrenosum. (See Presentation, DDx, and Workup.)Patients with pyoderma gangrenosum may have involvement of other organ systems that manifests as sterile neutrophilic infiltrates. Culture-negative pulmonary infiltrates are the most common extracutaneous manifestation. [3] Other organs systems that may be involved include the heart, the central nervous system, the gastrointestinal (GI) tract, the eyes, [4, 5] the liver, the spleen, the bones, and the lymph nodes. (See Presentation and Workup.)n Therapy for pyoderma gangrenosum involves the use of anti-inflammatory agents, including antibiotics, corticosteroids, immunosuppressive agents, and biologic agents. The prognosis is generally good; however, the disease can recur and residual scarring is common. (See Prognosis, Treatment, and Medication.)

Type 2 diabetes, once known as adult-onset or noninsulin-dependent diabetes, is a chronic condition that affects the way your body metabolizes sugar (glucose), your body's important source of fuel.

With type 2 diabetes, your body either resists the effects of insulin — a hormone that regulates the movement of sugar into your cells — or doesn't produce enough insulin to maintain a normal glucose level.

More common in adults, type 2 diabetes increasingly affects children as childhood obesity increases. There's no cure for type 2 diabetes, but you may be able to manage the condition by eating well, exercising and maintaining a healthy weight. If diet and exercise aren't enough to manage your blood sugar well, you also may need diabetes medications or insulin therapy.

Ramsay Hunt syndrome happens when shingles affects nerves in your face close to either one of your ears. Shingles affecting either ear is a condition caused by a virus called herpes zoster oticus. The general varicella-zoster virus also causes chicken pox, which is most common in children. If you’ve had chicken pox in your life, the virus can reactivate later in your life and cause shingles. Both shingles and chicken pox are most recognizable by a rash that appears in the affected area of the body. Unlike chicken pox, a shingles rash near the facial nerves by your ears can cause other complications, including facial paralysis and ear pain. When this happens, it’s called Ramsay Hunt syndrome. If you get a rash on your face and also start noticing symptoms such as facial muscle weakness, see your doctor as soon as you can. Early treatment can help make sure you don’t experience any complications from Ramsay Hunt syndrome.

Raynaud's (ray-NOHZ) disease causes some areas of your body — such as your fingers and toes — to feel numb and cold in response to cold temperatures or stress. In Raynaud's disease, smaller arteries that supply blood to your skin narrow, limiting blood circulation to affected areas (vasospasm). Women are more likely than men to have Raynaud's disease, also known as Raynaud or Raynaud's phenomenon or syndrome. It appears to be more common in people who live in colder climates. Treatment of Raynaud's disease depends on its severity and whether you have other health conditions. For most people, Raynaud's disease isn't disabling, but it can affect your quality of life.

Renal refers to anything related to the kidneys. Renal arteries carry blood from the heart to the kidneys. They branch directly from the aorta (the main artery coming off the heart) on either side and extend to each kidney. These arteries take a very large volume of blood to the kidneys to be filtered The heart pumps out approximately 5 liters of blood per minute, and about 1-1.5 liters (25%) of the total volume of blood pumped by the heart passes through the kidneys every minute.

Rett syndrome is a rare, severe neurological disorder that affects mostly girls. It's usually discovered in the first two years of life, and a child's diagnosis with Rett syndrome can feel overwhelming. Although there's no cure, early identification and treatment may help girls and families who are affected by Rett syndrome. In the past, it was felt to be part of the Autism Spectrum Disorder. We now know that it is mostly genetically based.

Sarcomas are cancers that develop from connective tissues in the body, such as muscles, fat, bones, the linings of joints, or blood vessels. There are many types of sarcomas. Rhabdomyosarcoma (RMS) is a cancer made up of cells that normally develop into skeletal muscles. The body has 3 main types of muscles.

Ringworm of the body is a fungal infection that develops on the top layer of your skin. It's characterized by a red circular rash with clearer skin in the middle. It may itch. Ringworm gets its name because of its appearance. No actual worm is involved. Also called tinea corporis, ringworm of the body is closely related to athlete's foot (tinea pedis), jock itch (tinea cruris) and ringworm of the scalp (tinea capitis). Ringworm often spreads by direct skin-to-skin contact with an infected person or animal. Mild ringworm often responds to antifungal medications that you apply to your skin. For more-severe infections, you may need to take antifungal pills for several weeks

The rotator cuff is a group of muscles and tendons that surround the shoulder joint, keeping the head of your upper arm bone firmly within the shallow socket of the shoulder. A rotator cuff injury can cause a dull ache in the shoulder, which often worsens when you try to sleep on the involved side.Rotator cuff injuries occur most often in people who repeatedly perform overhead motions in their jobs or sports. Examples include painters, carpenters, and people who play baseball or tennis. The risk of rotator cuff injury also increases with age.Many people recover from rotator cuff disease with physical therapy exercises that improve flexibility and strength of the muscles surrounding the shoulder joint.Sometimes, rotator cuff tears may occur as a result of a single injury. In those circumstances, medical care should be provided as soon as possible. Extensive rotator cuff tears may require surgical repair, transfer of alternative tendons or joint replacement

Rumination syndrome, or Merycism, is a rare disorder that affects children and some adults. If your child has this condition, he or she will usually eat meals normally. But after about an hour or two, undigested food comes back up into his or her mouth from the esophagus. Your child will either rechew and reswallow the food, or spit it out. Typically this happens at every meal, day after day. Rumination is a reflex, not a conscious decision.

Salivary gland tumors are rare types of tumors that begin in the salivary glands.

Salivary gland tumors can begin in any of the salivary glands in your mouth, neck or throat. Salivary glands make saliva, which aids in digestion, keeps your mouth moist and supports healthy teeth.

You have three pairs of major salivary glands under and behind your jaw — parotid, sublingual and submandibular. Many other tiny salivary glands are in your lips, inside your cheeks, and throughout your mouth and throat.

Salivary gland tumors most commonly occur in the parotid gland, accounting for nearly 85 percent of all salivary gland tumors. Approximately 25 percent of parotid tumors are cancerous (malignant).

Treatment for salivary gland tumors often involves surgery. Treatments for salivary gland tumors may also include radiation therapy and chemotherapy.

Schizoid personality disorder is an uncommon condition in which people avoid social activities and consistently shy away from interaction with others. They also have a limited range of emotional expression.

If you have schizoid personality disorder, you may be seen as a loner or dismissive of others, and you may lack the desire or skill to form close personal relationships. Because you don't tend to show emotion, you may appear as though you don't care about others or what's going on around you.

The cause of schizoid personality disorder is unknown. Talk therapy, and in some cases medications, can help.

People with schizotypal personality disorder are often described as odd or eccentric and usually have few, if any, close relationships. They generally don't understand how relationships form or the impact of their behavior on others. They may also misinterpret others' motivations and behaviors and develop significant distrust of others.

These problems may lead to severe anxiety and a tendency to turn inward in social situations, as the person with schizotypal personality disorder responds inappropriately to social cues and holds peculiar beliefs.

Schizotypal personality disorder typically is diagnosed in early adulthood and is likely to endure, though treatment, such as medications and therapy, can improve symptoms.

Selective IgA deficiency is one of the most common types of PI. These individuals lack IgA, but usually have normal amounts of other immunoglobulins (antibodies). Many people go undiagnosed because they are never sick enough to be seen by a doctor, while others may develop a variety of severe problems.

Selective IgA Deficiency

IgA protects the body at surfaces that come in contact with the environment. These sites are the mucosal surfaces—mouth, ears, sinuses, nose, throat, airways within the lungs, gastrointestinal tract, eyes, and genitals.

IgA antibodies are transported in secretions to these mucosal surfaces and play a role in protecting them from infection, which is why IgA is known as a secretory antibody. Because the area of a person's mucosal surfaces is equal to 1.5 tennis courts, the importance of IgA in protecting these surfaces cannot be overstated.

Although people with selective IgA deficiency do not produce IgA, they do produce all the other immunoglobulins. In addition, the other aspects of their immune systems function properly.

The causes of selective IgA deficiency remain unknown. It is likely there are a variety of causes that vary from person to person.

Low serum IgA, like absent serum IgA, is relatively common. Most people with low serum IgA have no apparent illness; others have symptoms similar to 

Nonsuicidal self-injury, often simply called self-injury, is the act of deliberately harming the surface of your own body, such as cutting or burning yourself. It's typically not meant as a suicide attempt. Rather, this type of self-injury is an unhealthy way to cope with emotional pain, intense anger and frustration. While self-injury may bring a momentary sense of calm and a release of tension, it's usually followed by guilt and shame and the return of painful emotions. Although life-threatening injuries are usually not intended, with self-injury comes the possibility of more serious and even fatal self-aggressive actions.

Serotonin syndrome occurs when you take medications that cause high levels of the chemical serotonin to accumulate in your body.Serotonin syndrome can occur when you increase the dose of such a drug or add a new drug to your regimen. Certain illegal drugs and dietary supplements also are associated with serotonin syndrome.Serotonin is a chemical your body produces that's needed for your nerve cells and brain to function. But too much serotonin causes symptoms that can range from mild (shivering and diarrhea) to severe (muscle rigidity, fever and seizures). Severe serotonin syndrome can be fatal if not treated. Milder forms of serotonin syndrome may go away within a day of stopping the medications that cause symptoms and, sometimes, taking drugs that block serotonin

Your bowels are made up of two parts -- the large intestine, also called the colon, and the small intestine. Short bowel syndrome usually affects people who’ve had a lot of their small intestine removed. Without this part, your body can’t get enough nutrients and water from the food you eat. This causes bowel troubles, like diarrhea, which can be dangerous if you go without treatment.If you learn you have short bowel syndrome, know that doctors can do a lot of things to ease your symptoms and make sure you get the right nutrition. People who have the disease can lead active lives.Over time, your body may adjust to having a shorter small intestine, and you may be able to take fewer medicines. The key is to stick to your treatment plan and get the support you need.

The sinus node is a specialized group of cells in the upper chamber of the heart, the right atrium, that creates electrical signals that regulate the pace and rhythm of the heartbeat. Normally, the sinus node produces a regular, steady pattern of signals. With SSS, the pattern is irregular. The normal heart beat should increase with activity and decrease with rest and sleep.  With SSS, this function is disrupted, with a heart beat that is too slow for the patient's level of activity.

Sjögren syndrome is a systemic chronic inflammatory disorder characterized by lymphocytic infiltrates in exocrine organs. Most individuals with Sjögren syndrome present with sicca symptoms, such as xerophthalmia (dry eyes), xerostomia (dry mouth), and parotid gland enlargement, which is seen in the image below. [1] (See Presentation.)

It's normal to feel nervous in some social situations. For example, going on a date or giving a presentation may cause that feeling of butterflies in your stomach. But in social anxiety disorder, also called social phobia, everyday interactions cause significant anxiety, fear, self-consciousness and embarrassment because you fear being scrutinized or judged by others In social anxiety disorder, fear and anxiety lead to avoidance that can disrupt your life. Severe stress can affect your daily routine, work, school or other activities.Social anxiety disorder is a chronic mental health condition, but learning coping skills in psychotherapy and taking medications can help you gain confidence and improve your ability to interact with others

Solitary fibrous tumors are rare growths of soft tissue cells that can form nearly anywhere in the body.Solitary fibrous tumors most often occur in the lining around the outside of the lungs (pleural solitary fibrous tumors). Solitary fibrous tumors have also been found in the head and neck, breast, kidney, prostate, spinal cord, and other sites.Most solitary fibrous tumors are noncancerous (benign), but in rare cases, solitary fibrous tumors can be cancerous (malignant). Solitary fibrous tumors tend to grow slowly and may not cause signs and symptoms until they become very large.

Allergy to soy, a product of soybeans, is a common food allergy. Often, soy allergy starts in infancy with reaction to soy-based infant formula. Although most children outgrow soy allergy, some carry the allergy into adulthood.Mild signs and symptoms of soy allergy include hives or itching in and around the mouth. In rare cases, soy allergy can cause a life-threatening allergic reaction (anaphylaxis).If you or your child has a reaction to soy, let your doctor know. Tests can help confirm a soy allergy.Having a soy allergy means avoiding products that contain soy, which can be difficult. Many foods, such as meat products, bakery goods, chocolate and breakfast cereals, may contain soy.

A spinal cord injury is damage to the spinal cord. It’s an extremely serious type of physical trauma that’s likely to have a lasting and significant impact on most aspects of daily life.The spinal cord is a bundle of nerves and other tissue that the vertebrae of the spine contains and protects. The vertebrae are the bones stacked on top of each other that make up the spine. The spine contains many nerves, and extends from the brain’s base down the back, ending close to the buttocks.The spinal cord is responsible for sending messages from the brain to all parts of the body. It also sends messages from the body to the brain. We’re able to perceive pain and move our limbs because of messages sent through the spinal cord.If the spinal cord sustains an injury, some or all of these impulses may not be able to “get through.” The result is a complete or total loss of sensation and mobility below the injury. A spinal cord injury closer to the neck will typically cause paralysis throughout a larger part of the body than one in the lower back area.

Stickler syndrome is a genetic disorder caused by mutations in genes that are responsible for forming collagen, proteins which add strength and elasticity to connective tissue. Stickler syndrome affects connective tissue throughout the body, but most notably in the eyes (it is the most common cause of retinal detachment in children), ears, face, and joints.Stickler syndrome affects 1 out of every 7,500 people, but experts believe that it is widely under-diagnosed. While there is no medical cure for Stickler syndrome, when it is identified early, there is a lot that people can do to treat the problems it causes.

Down syndrome is a set of physical and mental traits caused by a gene problem that happens before birth. Children who have Down syndrome tend to have certain features, such as a flat face and a short neck. They also have some degree of intellectual disability. This varies from person to person. But in most cases it is mild to moderate.

Down syndrome is a lifelong condition. But with care and support, children who have Down syndrome can grow up to have healthy, happy, productive lives.

Stomach polyps — also called gastric polyps — are masses of cells that form on the lining inside your stomach. These polyps are rare and usually don't cause any signs or symptoms. Stomach polyps are most often discovered when your doctor is examining you for some other reason.Most stomach polyps don't become cancerous. But certain types can increase your risk of stomach cancer in the future. Depending on the type of stomach polyp you have, treatment might involve removing the polyp or monitoring it for changes.

Sun allergy is a term often used to describe a number of conditions in which an itchy red rash occurs on skin that's been exposed to sunlight. The most common form of sun allergy is polymorphic light eruption, also known as sun poisoning.Some people have a hereditary type of sun allergy, while others develop signs and symptoms only when triggered by another factor — such as certain types of medications or skin exposure to plants such as limes or wild parsnip.Mild cases of sun allergy may resolve without treatment. More severe cases may require steroid creams or pills. People who have a severe sun allergy may need to take preventative measures and wear sun-protective clothing.

An arrhythmia is an abnormality in the timing or pattern of the heartbeat. Arrhythmias may cause the heart to beat too rapidly, too slowly, or irregularly. They are common and may cause a wide variety of symptoms, such as a racing, skipping or fluttering sensation (called palpitations) in your chest.Cardiac arrhythmias also may cause light-headedness, fainting, chest pain, shortness of breath, fatigue or no symptoms at all. Many types of arrhythmia are merely nuisances, other types may be serious problems because they cause the patient to develop heart failure, pass out or even die suddenly when the heart beats too slowly or too rapidly to pump blood to the body.Supraventricular tachycardia is a series of rapid heartbeats that begin in or involve the upper chambers (atria) of the heart. SVT can cause the heart to beat very rapidly or erratically. As a result, the heart may beat inefficiently, and the body may receive an inadequate blood supply. There are three major types of SVT including:

Tachycardia is a common type of heart rhythm disorder (arrhythmia) in which the heart beats faster than normal while at rest.It's normal for your heart rate to rise during exercise or as a physiological response to stress, trauma or illness (sinus tachycardia). But in tachycardia (tak-ih-KAHR-dee-uh), the heart beats faster than normal in the upper or lower chambers of the heart or both while at rest.Your heart rate is controlled by electrical signals sent across heart tissues. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals that quicken the heart rate, which is normally about 60 to 100 beats a minute at rest.In some cases, tachycardia may cause no symptoms or complications. But if left untreated, tachycardia can disrupt normal heart function and lead to serious complications, including:

Sweet’s syndrome (also known as acute febrile neutrophilic dermatosis) is an uncommon skin disorder characterised by a fever and the appearance of tender red lumps on the skin. It is a reactive condition with a number of potential triggers. It is not contagious and cannot be transferred from one person to another.

Swollen lymph nodes usually occur as a result of exposure to bacteria or viruses. When swollen lymph nodes are caused by an infection, this is known as lymphadenitis (lim-fad-uh-NIE-tis). Rarely, swollen lymph nodes are caused by cancer.Your lymph nodes, also called lymph glands, play a vital role in your body's ability to fight off infections. They function as filters, trapping viruses, bacteria and other causes of illnesses before they can infect other parts of your body. Common areas where you might notice swollen lymph nodes include your neck, under your chin, in your armpits and in your groin.In some cases, the passage of time and warm compresses may be all you need to treat swollen lymph nodes. Treatment of lymphadenitis depends on the cause.

Synovial sarcoma is a type of soft-tissue sarcoma. It is a rare cancer. Only about 1 to 3 individuals in a million people are diagnosed with this disease each year. It can occur at any age, but it is more common among teenagers and young adults. Synovial sarcoma seems to have a slight preference for males, with 12 male patients for every 10 female patients. Despite its name, synovial sarcoma is not related to the synovial tissues that are a part of the joints. The disease starts most commonly in the legs or arms, but it can appear in any part of the body. On a pathology report, synovial sarcoma may be classified in different subtypes depending on what it looks like under the microscope or what specific gene mutation is involved. Synovial sarcoma is a high grade tumor. It spreads to distant sites in up to 50% of cases.

Syphilis is a sexually transmitted infection (STI) caused by a type of bacteria known as Treponema pallidum. In 2016, more than 88,000 cases of syphilis were reported in the United States, according to the Centers for Disease Control and Prevention. The rate of women with syphilis has been declining in the United States, but the rate among men, particularly men who have sex with men, has been rising. The first sign of syphilis is a small, painless sore. It can appear on the sexual organs, rectum, or inside the mouth. This sore is called a chancre. People often fail to notice it right away.Syphilis can be challenging to diagnose. Someone can have it without showing any symptoms for years. However, the earlier syphilis is discovered, the better. Syphilis that remains untreated for a long time can cause major damage to important organs, like the heart and brain.Syphilis is only spread through direct contact with syphilitic chancres. It can’t be transmitted by sharing a toilet with another person, wearing another person’s clothing, or using another person’s eating utensils

Syringomyelia is a rare disorder in which a cyst forms within your spinal cord. As this fluid-filled cyst, or syrinx, expands and lengthens over time, it compresses and damages part of your spinal cord from its center outward.Damage to the spinal cord caused by a syrinx can lead to symptoms such as progressive pain, stiffness, and weakness in the:back shoulders arms legs People with the disorder might lose the ability to feel cold and pain normally. Some people with this disorder won’t have any symptoms and won’t need treatment. For others, syringomyelia will cause symptoms and complications that worsen as the syrinx expands.Treatment aims to relieve the pressure on your spinal cord. The treatment your doctor suggests for you will depend on the cause of your syringomyelia. Follow-up care after surgery is important because syringomyelia can reoccur.

Systemic mastocytosis (mas-to-sy-TOE-sis) is a disorder that results in an excessive number of mast cells in your body. Mast cells normally help protect you from disease and aid in wound healing by releasing substances such as histamine and leukotrienes. But if you have systemic mastocytosis, excess mast cells generally build up in your skin, bone marrow, gastrointestinal tract and bones. When triggered, these mast cells release substances that can overwhelm your body and result in signs and symptoms such as facial flushing, itching, a rapid heartbeat, abdominal cramps, lightheadedness or even loss of consciousness. Common triggers include alcohol, temperature changes, spicy foods and certain medications.Several types of systemic mastocytosis exist. The most common form — indolent systemic mastocytosis — progresses slowly.The second most common form is systemic mastocytosis associated with a second blood disorder. Another type, aggressive systemic mastocytosis, develops rapidly and is often associated with organ damage. Mast cell leukemia and mast cell sarcoma are extremely rare forms of systemic mastocytosis.

Dry hair develops when your hair doesn't get or retain enough moisture. This reduces its sheen and can make it appear frizzy, lifeless, and dull. ... If your hair is healthy, natural oils in the outer layer help protect the inner layers. They also reflect light, making your hair appear shiny.

Takotsubo cardiomyopathy is a weakening of the left ventricle, the heart's main pumping chamber, usually as the result of severe emotional or physical stress, such as a sudden illness, the loss of a loved one, a serious accident, or a natural disaster such as an earthquake. (For additional examples, see "Stressors associated with takotsubo cardiomyopathy.") That's why the condition is also called stress-induced cardiomyopathy, or broken-heart syndrome. The main symptoms are chest pain and shortness of breath.

Tetralogy of Fallot (teh-TRAL-uh-jee of fuh-LOW) is a rare condition caused by a combination of four heart defects that are present at birth (congenital).These defects, which affect the structure of the heart, cause oxygen-poor blood to flow out of the heart and to the rest of the body. Infants and children with tetralogy of Fallot usually have blue-tinged skin because their blood doesn't carry enough oxygen.Tetralogy of Fallot is often diagnosed during infancy or soon after. However, tetralogy of Fallot might not be detected until later in life in some adults, depending on the severity of the defects and symptoms.With early diagnosis followed by appropriate surgical treatment, most children and adults who have tetralogy of Fallot live relatively normal lives, though they'll need regular medical care throughout life and might have restrictions on exercise

Dry mouth: The condition of not having enough saliva to keep the mouth wet. This is due to inadequate function of the salivary glands. Everyone has dry mouth once in a while when they are nervous, upset or under stress. But if someone has a dry mouth most all of the time, it can be uncomfortable and lead to serious health problems.
Dry mouth can cause difficulties in tasting, chewing, swallowing, and speaking. If it goes untreated, severe dry mouth can also lead to increased levels of tooth decay and infections of the mouth such as thrush. Severe dry mouth is not a normal part of aging. It can be a clue to systemic diseases such as Sjogren syndrome, systemic lupus erythematosus, rheumatoid arthritis, scleroderma, sarcoidosis, amyloidosis, and hypothyroidism. Some medications can also cause dry mouth.

A thoracic aortic aneurysm is a weakened area in the upper part of the aorta. The aorta is the major blood vessel that feeds blood to the body.A thoracic aortic aneurysm may also be called thoracic aneurysm and aortic dissection (TAAD) because an aneurysm can lead to a tear in the artery wall (dissection) that can cause life-threatening bleeding. Small and slow-growing thoracic aortic aneurysms may not ever rupture, but large, fast-growing aneurysms may rupture.Depending on the size and growth rate of your thoracic aortic aneurysm, treatment may vary from watchful waiting to emergency surgery. Ideally, surgery for a thoracic aortic aneurysm can be planned if necessary.

The term ‘thoracic outlet syndrome’ describes compression of the neurovascular structures as they exit through the thoracic outlet (cervicothoracobrachial region). The thoracic outlet is marked by the anterior scalene muscle anteriorly, the middle scalene posteriorly, and the first rib inferiorly. This condition has emerged as one of the most controversial topics in musculoskeletal medicine and rehabilitation [2]. This controversy extends to almost every aspect of the pathology including the definition, incidence, pathoanatomical contributions, diagnosis, and treatment.The term ‘TOS’ does not specify the structure being compressed. Investigators namely identify two main categories of TOS: the vascular form (arterial or venous), which raises few diagnostic problems, and the neurological form, which occurs in more than 95-99% of all cases of TOS. Therefore the syndrome should be differentiated by using the terms arterial TOS (ATOS), venous TOS (VTOS) or neurogenic 

Thrombocytopenia is a condition in which you have a low blood platelet count. Platelets (thrombocytes) are colorless blood cells that help blood clot. Platelets stop bleeding by clumping and forming plugs in blood vessel injuries.Thrombocytopenia often occurs as a result of a separate disorder, such as leukemia or an immune system problem. Or it can be a side effect of taking certain medications. It affects both children and adults.Thrombocytopenia may be mild and cause few signs or symptoms. In rare cases, the number of platelets may be so low that dangerous internal bleeding occurs. Treatment options are available.

Thrombocytosis is a disorder in which your body produces too many platelets (thrombocytes), which play an important role in blood clotting. The disorder is called reactive thrombocytosis or secondary thrombocythemia when it's caused by an underlying condition, such as an infection.Thrombocytosis (throm-boe-sie-TOE-sis) may also, less commonly, be caused by a blood and bone marrow disease. When caused by a bone marrow disorder, thrombocytosis is called autonomous, primary or essential thrombocytosis, or essential thrombocythemia.Your doctor may detect thrombocytosis in routine blood test results that show a high platelet level. If your blood test indicates thrombocytosis, it's important to determine whether it's reactive thrombocytosis or if you have essential thrombocythemia, which is more likely to cause blood clots.

Dry skin: Abnormally dry skin. Can be caused by a dry climate, winter weather, severe deficiency of vitamin A, systemic illness, overexposure to sunlight, or medication. The skin loses moisture. It may crack and peel. Or it may become irritated, inflamed, and itch. Bathing frequently, especially with soaps, can contribute to dry skin.
With dry skin, it can help to keep baths or showers short in warm water with as little soap as possible, drying the skin gently -- pat without rubbing. Dry skin can also usually be addressed by the use of over-the-counter (OTC) topical preparations for dry skin. If these products do not relieve the condition, see a dermatologist for more specific remedies.

Turner syndrome is a chromosomal condition that affects development in females. The most common feature of Turner syndrome is short stature, which becomes evident by about age 5. An early loss of ovarian function (ovarian hypofunction or premature ovarian failure) is also very common. The ovaries develop normally at first, but egg cells (oocytes) usually die prematurely and most ovarian tissue degenerates before birth. Many affected girls do not undergo puberty unless they receive hormone therapy, and most are unable to conceive (infertile). A small percentage of females with Turner syndrome retain normal ovarian function through young adulthood.About 30 percent of females with Turner syndrome have extra folds of skin on the neck (webbed neck), a low hairline at the back of the neck, puffiness or swelling (lymphedema) of the hands and feet, skeletal abnormalities, or kidney problems. One third to one half of individuals with Turner syndrome are born with a heart defect, such as a narrowing of the large artery leaving the heart (coarctation of the aorta) or abnormalities of the valve that connects the aorta with the heart (the aortic valve). Complications associated with these heart defects can be life-threatening.Most girls and women with Turner syndrome have normal intelligence. Developmental delays, nonverbal learning disabilities, and behavioral problems are possible, although these characteristics vary among affected individuals.

The term trisomy is used to describe the presence of three chromosomes, rather than the usual matched pair of chromosomes. For example, if a baby is born with three #21 chromosomes, rather than the usual pair, then the baby would be said to have "trisomy 21." Trisomy 21 is also known as Down syndrome. Other examples of trisomy include syndromes like trisomy 18 and trisomy 13. Again, trisomy 18 or trisomy 13 simply means the child has three copies of the #18 chromosome (or of the #13 chromosome) present in each cell of the body, rather than the usual pair.

Trisomy X is a disorder that affects females and is characterized by the presence of an additional X chromosome. Normally, females have two X chromosomes; however, females with trisomy X carry three X chromosomes in the nuclei of body cells. There are specific physical features (phenotype) associated with this chromosomal disorder. Common symptoms that can potentially occur include language-based learning disabilities, developmental dyspraxia, tall stature, low muscle tone (hypotonia), and abnormal bending or curving of the pinkies toward the ring fingers (clinodactyly). Trisomy X occurs randomly as a result from errors during the division of reproductive cells in one of the parents. This disorder occurs in one in 900 to 1,000 live births.

Transverse myelitis is an inflammation of the spinal cord, a major part of the central nervous system.  The spinal cord carries nerve signals to and from the brain through nerves that extend from each side of the spinal cord and connect to nerves elsewhere in the body.  The term myelitis refers to inflammation of the spinal cord; transverse refers to the pattern of changes in sensation—there is often a band-like sensation across the trunk of the body, with sensory changes below.Causes of transverse myelitis include infections, immune system disorders, and other disorders that may damage or destroy myelin, the fatty white insulating substance that covers nerve cell fibers.  Inflammation within the spinal cord interrupts communications between nerve fibers in the spinal cord and the rest of the body, affecting sensation and nerve signaling below the injury.  Symptoms include pain, sensory problems, weakness in the legs and possibly the arms, and bladder and bowel problems.  The symptoms may develop suddenly (over a period of hours) or over days or weeks.Transverse myelitis can affect people of any age, gender, or race.  It does not appear to be genetic or run in families.  A peak in incidence rates (the number of new cases per year) appears to occur between 10 and 19 years and 30 and 39 years.  It is estimated that about 1,400 new cases of transverse myelitis are diagnosed each year in the United States.Although some people recover from transverse myelitis with minor or no residual problems, the healing process may take months to years.  Others may suffer permanent impairments that affect their ability to perform ordinary tasks of daily living.  Some individuals will have only one episode of transverse myelitis; other individuals may have a recurrence, especially if an underlying illness caused the disorder.There is no cure for transverse myelitis.  Treatments to prevent or minimize permanent neurological deficits include corticosteroid and other medications that suppress the immune system, plasmapheresis (removal of proteins from the blood), or antiviral medications.

Traumatic brain injury (TBI) is a complex injury with a broad spectrum of symptoms and disabilities. The impact on a person and his or her family can be devastating. The purpose of this site is to educate and empower caregivers and survivors of traumatic brain injuries. This site aims to ease the transition from shock and despair at the time of a brain injury to coping and problem solving. Bookmark this site for the latest medical breakthroughs and brain research, the highest quality treatment for brain damage, the symptoms of brain injuries and the nation's best traumatic brain injury rehabilitation centers and resource information.

Toxic shock syndrome is a rare but serious medical condition caused by a bacterial infection. It is caused when the bacterium Staphylococcus aureus gets into the bloodstream and produces toxins.Although toxic shock syndrome has been linked to superabsorbent tampon use in menstruating women, this condition can affect men, children, and people of all ages. 

Tourette syndrome (TS) is a neurological disorder characterized by repetitive, stereotyped, involuntary movements and vocalizations called tics. The disorder is named for Dr. Georges Gilles de la Tourette, the pioneering French neurologist who in 1885 first described the condition in an 86-year-old French noblewoman.The early symptoms of TS are typically noticed first in childhood, with the average onset between the ages of 3 and 9 years. TS occurs in people from all ethnic groups; males are affected about three to four times more often than females. It is estimated that 200,000 Americans have the most severe form of TS, and as many as one in 100 exhibit milder and less complex symptoms such as chronic motor or vocal tics. Although TS can be a chronic condition with symptoms lasting a lifetime, most people with the condition experience their worst tic symptoms in their early teens, with improvement occurring in the late teens and continuing into adulthood.

Uterine polyps are soft red outgrowths from the lining of the womb (the endometrium), usually less than 1 cm in diameter, which often flatten to fit the cavity of the uterus.The stalk of the polyp (or pedicle) is usually short, but sometimes it grows long enough for the polyp to project from the cervix (the lower opening of the womb). Polyps are prone to bleeding, and a uterine polyp that develops near the fallopian tubes may obstruct the opening of the tubes, possibly leading to difficulty with becoming pregnant. Uterine polyps can develop in pre- or post-menopausal women. Very rarely, polyps can be cancerous.

A urinary tract infection (UTI) is an infection in any part of your urinary system — your kidneys, ureters, bladder and urethra. Most infections involve the lower urinary tract — the bladder and the urethra.Women are at greater risk of developing a UTI than are men. Infection limited to your bladder can be painful and annoying. However, serious consequences can occur if a UTI spreads to your kidneys.Doctors typically treat urinary tract infections with antibiotics. But you can take steps to reduce your chances of getting a UTI in the first place

Puffiness under the eyes can be bothersome, but it’s usually just a cosmetic concern. While rare, undereye puffiness can be a symptom of some kidney and thyroid conditions. If you occasionally wake up with puffiness under the eyes, consider what you did the day before to look for lifestyle causes such as staying up late or eating too much salt. Consider talking to your doctor about possible treatments for chronic undereye puffiness.

Ophthalmology is a branch of medicine dealing with the diagnosis, treatment and prevention of diseases of the eye and visual system. The eye, its surrounding structures and the visual system can be affected by a number of clinical conditions. Ophthalmology involves diagnosis and therapy of such conditions, along with microsurgery. Eye health services are becoming more and more important as the UK population ages. An ageing population means there are more and more incidences of age-related diseases of the eye, such as age-related macular degeneration. These eye diseases can be successfully treated if caught early, and can be managed effectively with existing treatments and medicines. Cataracts are the main cause of impaired vision worldwide, and in England and Wales it is estimated that around 2.5 million people aged 65 or older have some degree of visual impairment caused by cataracts. Cataract surgery is the second most common operation performed in the NHS in England – over 300,000 procedures are performed each year. Patients and members of the general public can view more information about eye conditions and treatments in our ‘For Patients‘ section.

At the foundation of fusion yoga is a community of people coming together to practice yoga as a way to be free of pain, to think more clearly, and to have a better relationship with the world.  Fusion yoga is a supporting, exciting, and empowering experience for yoga practitioners of every level. Whether you're new or highly experienced, you'll find a class offering that meets your needs.  Our yoga classes are meant to challenge you mentally and physically.  All classes ask you to look within- to tap into your own innate needs, potential and expression as you cultivate your own experience.

Yoga is a science, that is, it is a body of techniques that lead us to consciously connect with ourselves and with life, the experience of yoga. As yoga is a science, there is no dogma or belief system attached to it. Yoga simply tells us to do a certain practice and then to feel the effect of that practice, e.g. if we breath slowly in a relaxed manner we will slow our heart rate; if we focus the mind we will develop mental peace and deep insight.

If you are bored of lifting heavy weights, doing yoga and other regular stretching exercises then AEROBICS is the right option for you. You will not only enjoy doing it but also reap several health benefits out of it. Aerobics is a kind of cardio workout that causes you to breathe harder, makes you sweat and gets your heart pumping faster than at rest. Dance moves you perform in this, makes the heart and lungs work harder as the body’s need for oxygen is increased. So, get your heart pumping with Bong beauty Bipasha Basu, performing aerobics dance workout.

A nine-to-five job shackled to your cubicle leaves you with hardly any stamina to hit the gym in the evenings. Add to that, lack of motivation and it can only spell doom for your waistline. In such a scenario, can a party workout be that much-needed boost The party workout is redefining the concept of the workout, which brings the dance club into the gym. Fitness clubs host disco-lit classes of boot-camp style routines set to pumping music played by DJs. It's the latest fitness fad hitting New York gyms, and is generally wrapped up with post-workout 'pretend'tinis made from vitamin water! While it sounds like the perfect fix for those who want a club experience minus the calories of cocktails, can it really work for you? We get experts to comment.

An echocardiogram (echo) is a graphic outline of the heart's movement. During an echo test, ultrasound (high-frequency sound waves) from a hand-held wand placed on your chest provides pictures of the heart's valves and chambers and helps the sonographer evaluate the pumping action of the heart. Echo is often combined with Doppler ultrasound and color Doppler to evaluate blood flow across the heart's valves.

Fetal echocardiography is a test similar to an ultrasound. This exam allows your doctor to better see the structure and function of your unborn child’s heart. It’s typically done in the second trimester, between weeks 18 to 24.

The exam uses sound waves that “echo” off of the structures of the fetus’ heart. A machine analyzes these sound waves and creates a picture, or echocardiogram, of their heart’s interior. This image provides information on how your baby’s heart has formed and whether it’s working properly.

It also allows your doctor to see the blood flow through their heart. This in-depth look allows your doctor to find any defects or abnormalities in the baby’s blood flow or heartbeat.

The child will lie down tilted slightly on his / her side on a hospital bed in our child-friendly examination room, not an operating room. Many exam rooms are equipped with a television to keep a child entertained and alleviate boredom. The child must be undressed from the waist up and can choose to wear a short gown.

To improve the quality of the pictures, a colorless, warm gel is applied to the skin on the area of the chest where the heart is located. A transducer, a small microphone-like device, is placed on top of the gel and against the skin. The transducer uses sound waves, which bounce off the different parts of a child's heart, creating a picture.

The transducer is moved over the chest, abdominal area, and neck in order to obtain the images.

The sounds you may hear from the echo machine are the sounds of the blood flowing from one chamber to another and the valves opening or closing as the blood moves through the heart.

The colors you see on the screen are not the colors of the blood. The colors tell us what direction the blood is flowing. The red color shows the blood is flowing towards the transducer and the blue color shows blood is flowing away. A child may feel some discomfort from the pressure of the transducer. Pediatric echosonographers are trained to complete scans in as pain-free and patient-sensitive manner as possible. 

A computer interprets the information from the transducer to make an image of the heart appear on the screen. This image is recorded into a digital storage system for the cardiologist to measure and review. 

A stress echocardiography, also called an echocardiography stress test or stress echo, is a procedure that determines how well your heart and blood vessels are working.

During a stress echocardiography, you’ll exercise on a treadmill or stationary bike while your doctor monitors your blood pressure and heart rhythm. When your heart rate reaches peak levels, your doctor will take ultrasound images of your heart to determine whether your heart muscles are getting enough blood and oxygen while you exercise.

Your doctor may order a stress echocardiography test if you have chest pain that they think is due to coronary artery disease or a myocardial infarction, which is a heart attack. This test also determines how much exercise you can safely tolerate if you’re in cardiac rehabilitation. The test can also tell your doctor how well treatments such as bypass grafting, angioplasty, and anti-anginal or antiarrhythmic medications are working.

A brainstem auditory evoked response (BAER) test measures how your brain processes the sounds you hear. The BAER test records your brainwaves in response to clicks or other audio tones that are played for you. The test is also called a brainstem auditory evoked potentials (BAEP) or auditory brainstem response (ABR) test.

A BAER test can help to diagnose hearing loss and nervous system disorders, especially in newborns, young children, and others who may not be able to participate in a standard hearing test.

BAER tests are often administered to canines and are the only scientifically reliable way to test a dog’s ability to hear with one or both ears.

A somatosensory evoked potential (SSEP) is an evoked potential caused by a physical stimulus (usually a small electric pulse). Electrodes positioned over particular areas of the body record responses of the SSEP, these are then observed as a reading on an electroencephalogram (EEG).  A SSEP can most commonly involve stimulation of the median nerve at the wrist, or the posterior tibial nerve at the ankle. This investigation therefore tests the pathway of the sensory nerves to the sensory areas of the brain, even though the stimuli are non-physiological.

Somatosensory Evoked Potentials (SSEPs) are electric signals recorded from the scalp or spine following stimulation to the peripheral nerves. They are time-locked responses, representing the function of the ascending sensory pathways. Early in the 1960s Larson et al introduced the use of somatosensory evoked potentials to monitor neural structure during neurosurgical procedures. It was utilized as a supplement to the wake-up test during correctional spinal surgeries for spinal deformities such as scoliosis to provide warning of compromised spinal cord function to the spine surgeons, as reported by McCallum et al and Nash et al in the 1970s. Since then SSEP has become one of the earliest and primary tools for intraoperative neurophysiological monitoring.

Somatosensory Evoked Potentials (SSEPs) are electrical responses recorded from the nervous system following electrical stimulation of a peripheral nerve.  For example, stimulation of the median nerve at the wrist produces electrical activity that travels along the sensory pathway on its way to the brain. This activity can be recorded with electrodes positioned along that pathway.

A bone density test is the only test that can diagnose osteoporosis before a broken bone occurs. This test helps to estimate the density of your bones and your chance of breaking a bone. NOF recommends a bone density test of the hip and spine by a central DXA machine to diagnose osteoporosis. DXA stands for dual energy x-ray absorptiometry.

You can find out whether you have osteoporosis or if you should be concerned about your bones by getting a bone density test. Some people also call it a bone mass measurement test. This test uses a machine to measure your bone density. It estimates the amount of bone in your hip, spine and sometimes other bones. Your test result will help your healthcare provider make recommendations to help you protect your bones.

Are you a postmenopausal woman or man age 50 and older? Have you recently broken a bone? If you answered “yes” to both questions, you should talk to your doctor or other healthcare provider about getting a bone density test if you’ve never had one.

You will lie on a narrow table that slides into the center of the CT scanner. Most often, you will lie on your back with your arms raised above your head.

Once you are inside the scanner, the machine's x-ray beam rotates around you. Modern "spiral" scanners can perform the exam without stopping.

A computer creates separate images of the belly area, called slices. These images can be stored, viewed on a monitor, or printed on film. Three-dimensional models of the belly area can be made by stacking the slices together.

You must be still during the exam, because movement causes blurred images. You may be told to hold your breath for short periods of time.

The scan should take less than 30 minutes.

An angiogram of the head and neck is an X-ray test that uses a special dye and camera (fluoroscopy) to take pictures of the blood flow in the blood vessels of the head and neck camera.gif. An angiogram of the neck (carotid angiogram) can be used to look at the large arteries in the neck that lead to the brain. An angiogram of the head (cerebral angiogram) can be used to look at the veins or the four arteries (four-vessel study) carrying blood to the brain.

During an angiogram, a thin, soft tube called a catheter is placed camera.gif into a blood vessel in the groin (femoral artery or vein) or just above the elbow (brachial artery or vein). The catheter is guided to the head and neck area. Then an iodine dye (contrast material) is injected into the vessel to make the area show clearly on the X-ray pictures. The angiogram pictures can be made into regular X-ray films or stored as digital pictures in a computer.

An angiogram can find a bulge in a blood vessel (aneurysm). It can also show narrowing or a blockage in a blood vessel that slows or stops blood flow. An abnormal pattern of blood vessels (arteriovenous [AV] malformation) or abnormal vessels near a tumor can be seen.

A magnetic resonance angiogram (MRA) or computed tomography angiogram (CTA) may be an option instead of a standard angiogram. Each of these tests is less invasive than an angiogram. Some MRA tests and all CTA tests require an injection of dye. A CTA also involves radiation exposure.

This is a procedure used to evaluate the blood flow of the arteries in the arms or legs. Using image-guidance, doctors can determine if there is damage to or a blockage of blood flow in an artery. This is helpful in diagnosing certain conditions such as atherosclerosis (hardening of the blood vessel) or damage caused by trauma. This helps doctors in planning for future interventions, including vascular procedures (such as stent placement) or surgery.

You will be asked to lie on a narrow table that slides into the center of the CT scanner.

While inside the scanner, the machine's x-ray beam rotates around you.

A computer creates many separate images of the body area, called slices. These images can be stored, viewed on a monitor, or printed on film. Three-dimensional models of the head and neck area can be created by stacking the slices together.

You must be still during the exam, because movement causes blurred images. You may be told to hold your breath for short periods of time.

Complete scans usually take only a few seconds. The newest scanners can image your entire body, head to toe, in less than 30 seconds.

A computerized tomography (CT) coronary angiogram is an imaging test that looks at the arteries that supply blood to your heart. It might be used to diagnose the cause of chest pain or other symptoms.

A CT coronary angiogram relies on a powerful X-ray machine to produce images of your heart and its blood vessels. These tests are noninvasive and don't require recovery time. Coronary CT angiograms are increasingly an option for people with a variety of heart conditions.

A traditional (not CT-based) coronary angiogram requires that a flexible tube (catheter) be threaded through your groin or arm to your heart or coronary arteries. If you have known coronary artery disease, your doctor might recommend a traditional coronary angiogram because you can also receive treatment during that procedure.

Emphysema is a chronic lung disease caused by damage to the alveoli, the tiny air sacs in the lung where the exchange of oxygen and carbon dioxide takes place. With emphysema, damage to the alveoli results in air becoming trapped, causing them to expand and rupture.

Damage to alveoli, and the resultant compromise in air exchange results in a decreased level of oxygen in the blood (hypoxemia) combined with an increased level of carbon dioxide in the blood (hypercapnia).

Virtual colonoscopy is a minimally invasive exam to screen for cancer of the large intestine (colon cancer). Virtual colonoscopy is also known as a screening CT colonography.

Unlike traditional colonoscopy, which requires a scope to be inserted into your rectum and advanced through your colon, virtual colonoscopy uses a CT scan to produce hundreds of cross-sectional images of your abdominal organs. The images are combined and digitally manipulated to provide a detailed view of the inside of the colon and rectum.

Virtual colonoscopy is one option used to screen for colon cancer. Discuss your colon cancer screening options with your doctor to determine whether virtual colonoscopy is the right option for you.

Direct examination via endoscopy remains the criterion standard for evaluation of laryngotracheobronchial pathologic conditions. Endoscopy allows for easy visualization and accurate diagnosis of mucosal and superficial submucosal lesions. However, the evaluation of deeper structures is capable only through CT imaging or MRI. CT imaging has become the most commonly used technique for general laryngeal imaging. It is readily available at most hospitals and even at some outpatient centers. The acquisition time for a CT image is extremely short (within a matter of seconds), which is quite useful for the laryngeal examination, as patients are generally required to hold their breath to reduce movement. [1, 2]

Nevertheless, small lesions may still be difficult to visualize. In these cases, active techniques such as the Valsalva maneuver and phonation can better delineate masses of the hypoglottis and vocal cords, respectively.

MRI has also become more widely available in the past decade, although it has not surpassed CT scanning for conventional laryngeal imaging. Both techniques have advantages and disadvantages. For example, CT and MRI appear to be comparable in efficacy for defining the site and extent of disease in fat and muscle. MRI, however, is more sensitive for detecting pathologic involvement of cartilage (Glastonbury). CT imaging is best for evaluation of occult fractures and dislocations during laryngeal trauma. Furthermore, MRI seems to be the optimal method for examining cooperative patients, especially for preoperative larynx evaluation when partial laryngectomy is considered. CT imaging is more useful in patients who cannot lie still for the study (eg, inebriated, combative). The imaging study performed usually depends on the experience of the radiologist. Additionally, MRI avoids radiation exposure. For more information, please see the Medscape Reference articleMR Imaging of the Larynx.

A CT scan uses X-rays to make detailed pictures camera.gif of the spine and vertebrae camera.gif.

During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. The CT scanner sends X-rays through the body. Each rotation of the scanner takes a second and provides a picture of a thin slice of the organ or area being studied. One part of the scanning machine can tilt to follow the curve of your spine. All of the pictures are saved as a group on a computer. They also can be printed.

In some cases, a dye called contrast material may be put in a vein (IV) in your arm or into the spinal canal. The dye makes structures and organs easier to see on the CT pictures. The dye may be used to check blood flow and look for tumors, areas of inflammation, or nerve damage.

Computed tomography, more commonly known as a CT or CAT scan, is a diagnostic medical test that, like traditional x-rays, produces multiple images or pictures of the inside of the body.

The cross-sectional images generated during a CT scan can be reformatted in multiple planes, and can even generate three-dimensional images. These images can be viewed on a computer monitor, printed on film or transferred to a CD or DVD.

CT images of internal organs, bones, soft tissue and blood vessels provide greater detail than traditional x-rays, particularly of soft tissues and blood vessels.

Using specialized equipment and expertise to create and interpret CT scans of the body, radiologists can more easily diagnose problems such as cancer, cardiovascular disease, infectious disease, appendicitis, trauma and musculoskeletal disorders.

X-ray imaging, also called radiography, is a fast and easy way to identify and diagnose bone injuries and disorders such as arthritis, cancer, osteoporosis, fractures and infections. It is also used in conjunction with orthopedic surgery to ensure that a fracture or other injury has been properly aligned, and it can aid in the detection and diagnosis of abnormalities in the chest organs, including the heart and lungs. X-rays may be followed up with MRI, PET, CT, or ultrasound imaging if further testing is needed.

Fluoroscopy is a study of moving body structures. It’s much like an X-ray "movie" and is often done while a contrast dye moves through the part of the body being examined. A continuous X-ray beam is passed through the body part and sent to a video monitor so that the body part and its motion can be seen in detail. Fluoroscopy, as an imaging tool, allows healthcare providers to look at many body systems, including the skeletal, digestive, urinary, cardiovascular, respiratory, and reproductive systems.

Fluoroscopy may be used to evaluate specific areas of the body. These include the bones, bowel, muscles, heart vessels, and joints.

Hysterosalpingography is a procedure where x rays are taken of a woman's reproductive tract after a dye is injected.Hystero means uterus and salpingo means tubes, so hysterosalpingography literally means to take pictures of the uterusand fallopian tubes. This procedure may also be called hysterography (or HSG).As with other types of pelvic examinations, the woman will lie on her back on an examination table with her legssometimes raised in stirrups. The x-ray equipment is placed above the abdomen.A speculum is inserted into the vagina and a catheter (a thin tube) is inserted into the uterus through the cervix (theopening to the uterus). A small balloon in the catheter is inflated to hold it in place. A liquid water-based or oil-based dyeis then injected through the catheter into the uterus. This process can cause cramping, pain, and uterine spasms.As the dye spreads through the reproductive tract, the doctor may watch for blockages or abnormalities on an x-raymonitor. Several x rays will also be taken. The procedure takes approximately 15-30 minutes. The x rays will bedeveloped while the patient waits, but the final reading and interpretation of the x rays by a radiologist (a doctor whospecializes in x rays) may not be available for a few days.Interestingly, sometimes the hysterosalpingography procedure itself can be considered a treatment. The dye used cansometimes open up small blockages in the fallopian tubes. The need for additional test procedures or surgical treatmentsto deal with infertility should be discussed with the doctor.

Mammography is a specific type of breast imaging that uses low-dose x-rays to detect cancer early – before women experience symptoms – when it is most treatable. Tell your doctor about any breast symptoms or problems, prior surgeries, hormone use, whether you have a family or personal history of breast cancer, and if there’s a possibility you are pregnant. If possible, obtain copies of your prior mammograms and make them available to your radiologist on the day of your exam. Leave jewelry at home and wear loose, comfortable clothing. You may be asked to wear a gown. Don’t wear deodorant, talcum powder or lotion under your arms or on your breasts as these may appear on the mammogram and interfere with correct diagnosis.

Mammography plays a central part in early detection of breast cancers because it can show changes in the breast up to two years before a patient or physician can feel them. Current guidelines from the U.S. Department of Health and Human Services (HHS), the American Cancer Society (ACS), the American Medical Association (AMA) and the American College of Radiology (ACR) recommend screening mammography every year for women, beginning at age 40. Research has shown that annual mammograms lead to early detection of breast cancers, when they are most curable and breast-conservation therapies are available.

A micturating cysto-urethrogram (or MCU) is a study using X-rays that shows the bladder and urethra (the tube that carries urine from the bladder and out of the body) while passing urine (see children’s X-ray examination). The test is performed to find out if the urine goes from the bladder back up to the kidneys instead of out through the urethra, known as vesico-ureteric reflux (VUR). This can be the cause of recurrent urinary tract (in the bladder or kidneys) infection and kidney damage. The test also shows how the bladder empties and what the urethra looks like.This test is most commonly performed on children under six months of age, but can be used less commonly as an investigation for older children and adults with multiple recurrent urinary tract infections.

MR angiography (MRA) uses a powerful magnetic field, radio waves and a computer to evaluate blood vessels and help identify abnormalities or diagnose atherosclerotic (plaque) disease. This exam does not use ionizing radiation and may require an injection of a contrast material called gadolinium, which is less likely to cause an allergic reaction than iodinated contrast material. Tell your doctor about any health problems, recent surgeries or allergies and whether there’s a possibility you are pregnant. The magnetic field is not harmful, but it may cause some medical devices to malfunction. Most orthopedic implants pose no risk, but you should always tell the technologist if you have any devices or metal in your body. In some instances, your doctor will provide you with a card that includes information about your implant to give to the technologist. Guidelines about eating and drinking before your exam vary between facilities. Unless you are told otherwise, take your regular medications as usual. Leave jewelry at home and wear loose, comfortable clothing. You may be asked to wear a gown. If you have claustrophobia or anxiety, you may want to ask your doctor for a mild sedative prior to the exam.

Constipation has a high prevalence in the general population and is a cause for significant morbidity. It has been estimated that approximately 10% of the Indian population suffers from constipation. [1] Chronic constipation leads to approximately 2.5 million visits to the physicians in the United States annually. [2] Various definitions have been used for chronic constipation. However, recently, the Rome II criteria were developed to promote consistency in the diagnosis. [3] Constipation may be primary or secondary. Primary constipation may be due to slow transit disorder or anorectal expulsion disorder (obstructive defecation) or a combination of these. According to the National Institute for health and Clinical Excellence (NICE) guidelines issued in 2010, obstructed defecation syndrome (ODS) is characterized by the urge to defecate but an impaired ability to expel the fecal bolus. Symptoms include unsuccessful fecal evacuation attempts, excessive straining, pain, bleeding after defecation, and a sense of incomplete fecal evacuation. [4] Patients may also resort to digital rectal evacuation. Evaluation and treatment of these patients has been difficult. Magnetic resonance defecography (MRD) has been shown to demonstrate the structural abnormalities associated with ODS, and patients with significant structural abnormalities may benefit from surgical interventions like stapled transanal resection of rectum (STARR). Patients who do not demonstrate significant structural abnormalities can be referred for biofeedback techniques. We present our experience in a large series of patients with suspected ODS who underwent MRD at our tertiary care center.

Mammography is a screening tool for breast cancer. At NM Medical we employ advanced digital imaging technology for the dual benefits of optimum diagnostic quality and maximum patient comfort. Mammography is important because in its earliest stages breast cancer may not be palpable; it may be too small to feel as a lump or tissue change. Mammography can help detect these changes two years or more before you would feel them. Physical examination is also important because pre-menopausal breast tissue is often dense and fibrous, which may decrease the reliability of mammography for young women.

MR spectroscopy (MRS) allows tissue to be interrogated for the presence and concentration of various metabolites. Grossman and Yousem said "If you need this to help you, go back to page 1; everything except Canavan has low NAA, high Choline". This is perhaps a little harsh, however it is fair to say that MRS often does not add a great deal to an overall MR study but does increase specificity, and may help in improving our ability to predict histological grade.

Diffusion tensor imaging tractography, or DTI tractography, is an MRI (magnetic resonance imaging) technique that measures the rate of water diffusion between cells to understand and create a map of the body’s internal structures; it is most commonly used to provide imaging of the brain. This advanced imaging technique, which provides much more detailed images of the brain than a conventional MRI, may also be used in the diagnosis of stroke, acute ischemia, brain tumors and multiple sclerosis, as well as pre-operative planning.  Using MRI technology, DTI tractography is non-invasive and uses radio waves and a magnetic field to produce images of the brain, tissues and skull. MRI technology provides detailed images showing small changes in body tissue and blood flow, which makes it an extremely reliable tool for the detection of disease, injury, bleeding and swelling.  Loyola offers state-of-the-art imaging and diagnostic techniques in order to provide timely and accurate diagnosis for our patients. Our expert radiologists are recognized nationally for clinical excellence, innovative diagnostic and therapeutic methods and skilled use of the latest technology. Our experienced technologists provide testing in a caring and compassionate environment where we want you to feel comfortable asking any questions you may have about your test or procedure. 

A magnetic resonance angiogram (MRA) is a type of magnetic resonance imaging (MRI) scan that uses a magnetic field and pulses of radio wave energy to provide pictures of blood vessels inside the body. In many cases MRA can provide information that can't be obtained from an X-ray, ultrasound, or computed tomography (CT) scan. MRA can find problems with the blood vessels that may be causing reduced blood flow. With MRA, both the blood flow and the condition of the blood vessel walls can be seen. The test is often used to look at the blood vessels that go to the brain, kidneys, and legs. Information from an MRA can be saved and stored on a computer for further study. Photographs of selected views can also be made.During MRA, the area of the body being studied is placed inside an MRI machine. Contrast material is often used during MRA to make blood vessels show up more clearly.

When nerve cells in the brain fire electrical impulses at a rate of up to four times higher than normal, this causes a sort of electrical storm in the brain, known as a seizure. A pattern of repeated seizures is referred to as epilepsy. Known causes include head injuries, brain tumors, lead poisoning, maldevelopment of the brain, genetic and infectious illnesses. But in fully half of cases, no cause can be found. Medication controls seizures for the majority of patients.

CSF flow studies are performed using a variety of MRI techniques and are able to qualitatively assess and quantify pulsatile CSF flow. The most common technique used is time resolved 2D phase contrast MRI with velocity encoding. Note, when referring to CSF flow in the setting on imaging we are referring to pulsatile to-and-fro flow due to vascular pulsations rather than bulk transport of CSF (the mechanism by which produced CSF is absorbed, via absorption at arachnoid granulations and via the glymphatic pathway). The latter is too slow to be easily assessed clinically. 

Erectile dysfunction is a common health condition affecting millions of men worldwide. It shadows their self-confidence and intimate lives. Such a condition can impact your personal life as it snatches away the excitement of getting intimate with your partner. Therefore, understanding all symptoms along with the erectile dysfunction causes is vital for a fulfilling sexual life. This article is a comprehensive guide to determining early signs of erectile dysfunction and treatments for ED. We will also discuss some major causes and treatments of this condition.

What is Erectile Dysfunction?

ED is a medical condition. Here, a man cannot achieve and maintain an erection which is necessary for satisfactory sexual performance. The major causes of this condition are:

• Diabetes

• Cardiovascular diseases

• Hormonal imbalances

People suffering from physiological conditions also get ED treatment. If you are making bad lifestyle choices like excessive alcohol consumption and no exercise, it also contributes to this condition. 

Myelography uses a real-time form of x-ray called fluoroscopy and an injection of contrast material to evaluate the spinal cord, nerve roots and spinal lining (meninges). It is particularly useful for assessing the spine following surgery and for assessing disc abnormalities in patients who cannot undergo MRI. You will be instructed on how to prepare. Tell your doctor if there’s a possibility you are pregnant and discuss any recent illnesses, medical conditions, medications you’re taking and allergies, especially to iodinated contrast materials. You may be advised to stop taking blood thinners or other medications several days prior to your exam. You also may be told to avoid solid food and increase your fluid intake beforehand. Leave jewelry at home and wear loose, comfortable clothing. You may be asked to wear a gown.

Neoplastic disease of the nose, paranasal sinuses, the nasopharynx and the parapharyngeal space requires thorough assessment of location and extent in order to plan appropriate treatment. CT allows the deep soft tissue planes to be evaluated and provides a complement to the physical examination. It is especially helpful in regions involving thin bony structures (paranasal sinuses, orbita); here CT performs better than MRI. MRI possesses many advantages over other imaging modalities caused by its excellent tissue contrast. In evaluating regions involving predominantly soft tissue structures (ec nasopharynx and parapharyngeal space) MRI is superior to CT. The possibility to obtain strictly consecutive volume data sets with spiral CT or 3D MRI offer excellent perspectives to visualize the data via 2D or 3D postprocessing. Because head and neck tumors reside in a complex area, having a 3D model of the anatomical features may assist in the delineation of pathology. Data sets may be transferred directly into computer systems and thus be used in computer assisted surgery.

Pituitary gland plays a central role in body growth, metabolism, and reproductive function. A number of diseases that affect the pituitary-hypothalamic axis can have profound clinical, endocrinological as well as neurological consequences. These conditions can be classified as neoplastic, infectious, inflammatory, posttraumatic, congenital/developmental, and physiological. Various neoplastic conditions include pituitary adenoma/apoplexy, hypothalamic glioma, craniopharyngioma, rathke cleft cyst, germinoma, teratoma, metastasis, leukemic infiltration, lymphoma, and Langerhans cell histiocytosis. Infectious and inflammatory causes include tubercular/lymphocytic hypophysitis, sarcoidosis, and Wegener's granulomatosis. Traumatic causes include postoperative sella or transection of the pituitary stalk. Accurate diagnostic differentiation of these lesions is essential for both safe and effective disease management. Recent advances in neuroimaging helps the radiologists and endocrinologists to study the pituitary region in greater detail. Magnetic resonance imaging (MRI) is the imaging modality of choice for evaluating hypothalamic-pituitary-related endocrine diseases.

Erectile dysfunction (ED) is the inability to get or keep an erection firm enough to have sexual intercourse. It’s also sometimes referred to as impotence.

Occasional ED isn’t uncommon. Many men experience it during times of stress. Frequent ED can be a sign of health problems that need treatment. It can also be a sign of emotional or relationship difficulties that may need to be addressed by a professional.

Not all male sexual problems are caused by ED. Other types of male sexual dysfunction include:

premature ejaculation

delayed or absent ejaculation

lack of interest in sex

Pulmonary function tests are a broad range of tests that measure how well the lungs take in and exhale air and how efficiently they transfer oxygen into the blood. Spirometry measures how well the lungs exhale. The information gathered during this test is useful in diagnosing certain types of lung disorders, but is most useful when assessing for obstructive lung diseases (especially asthma and chronic obstructive pulmonary disease, COPD). Lung volume measurement detects restrictive lung diseases. In this set of diseases, a person cannot inhale a normal volume of air. Restrictive lung diseases may be caused by inflammation or scarring of the lung tissue (interstitial lung disease) or by abnormalities of the muscles or skeleton of the chest wall. Testing the diffusion capacity (also called the DLCO) permits an estimate of how efficiently the lungs transfer oxygen from the air into the bloodstream.

A chalazion usually appears as a painless lump or swelling on your upper or lower eyelid. Chalazia may affect both upper and lower lids and can occur in both eyes at the same time. Depending on the size and location of the chalazion, it may blur or block vision.

Although not as common, a chalazion may be red, swollen, and painful if an infection is present.

A biophysical profile (BPP) test measures the health of your baby (fetus) during pregnancy. A BPP test may include a non stress test with electronic fetal heart monitoring and a fetal ultrasound. The BPP measures your baby's heart rate, muscle tone, movement, breathing, and the amount of amniotic fluid around your baby. A BPP is commonly done in the last trimester of pregnancy. If there is a chance that your baby may have problems during your pregnancy (high-risk pregnancy), a BPP may be done by 32 to 34 weeks or earlier. Some women with high-risk pregnancies may have a BPP test every week or twice a week in the third trimester. It is usually done to keep track of your baby’s health. 

 B-scan ultrasonography is an important adjuvant for the clinical assessment of various ocular and orbital diseases. With understanding of the indications for ultrasonography and proper examination technique, one can gather a vast amount of information not possible with clinical examination alone. This article is designed to describe the principles, techniques, and indications for echographic examination, as well as to provide a general understanding of echographic characteristics of various ocular pathologies. 

USG scan for Follicular Monitoring is done to study ovarian follicles that are used to identify ovulation of egg. For couples planning for pregnancy, ovulation period is the important period to try on, for conception to happen. Out of many ways available, the most reliable way to understand the ovulation is Follicular monitoring. It’s an endovaginal scan carried to study the ovaries, uterus and uterus lining. Looking at ovaries, the growth of follicles inside ovaries can be assessed giving a chance to predict the ovulation and also look if the womb is getting ready for pregnancy.

With follicular monitoring, you will get to know the growth of follicles, the approximate rupture period of follicles and hence can predict the ovulation period thereby have an intercourse happen at the right time for conception to take place. The womb if not yet ready for pregnancy can be treated by some supplements prescribed by the doctors.

This scan is carried out in a slightly dark examination room. You will have to undress down from your waist while you get covered by a sheet. Now you will be asked to position yourself lying down on your back on a special bed with your knees bent. Once you position yourself comfortably; the transducer, a sterile lubricated covered electronic device, is gently inserted into your vagina to look at the uterus and ovaries. Depending on how relaxed the patient is, the test takes up to 15 minutes.

Eyestrain is a common condition that occurs when your eyes get tired from intense use, such as while driving long distances or staring at computer screens and other digital devices.

Eyestrain can be annoying. But it usually isn't serious and goes away once you rest your eyes or take other steps to reduce your eye discomfort. In some cases, signs and symptoms of eyestrain can indicate an underlying eye condition that needs treatment.

Thyroid ultrasound uses sound waves to produce pictures of the thyroid gland within the neck. It does not use ionizing radiation and is commonly used to evaluate lumps or nodules found during a routine physical or other imaging exam.This procedure requires little to no special preparation. Leave jewelry at home and wear loose, comfortable clothing. You may be asked to wear a gown.

A sty is a red, painful lump near the edge of your eyelid that may look like a boil or a pimple. Sties are often filled with pus. A sty usually forms on the outside of your eyelid. But sometimes it can form on the inner part of your eyelid.

In most cases, a sty will begin to disappear on its own in a couple days. In the meantime, you may be able to relieve the pain or discomfort of a sty by applying a warm washcloth to your eyelid.

As an ancillary test for congenital adrenal hyperplasia (CAH), particularly in situations in which a diagnosis of 21-hydroxylase and 11-hydroxylase deficiency have been ruled out

Confirming a diagnosis of 3-beta-hydroxy dehydrogenase (3-beta-HSD) deficiency

Analysis for 17-hydroxypregnenolone is also useful as part of a battery of tests to evaluate females with hirsutism or infertility; both can result from adult-onset CAH

The hormone 17-hydroxyprogesterone is a building block for producing the hormone cortisol. Cortisol is produced mainly by the adrenal cortex (the outer part of the two adrenal glands, located above the kidneys). Cortisol is called the "stress hormone" because it's secreted in larger amounts as part of the body's response to physical or emotional stress.

Cortisol levels normally vary throughout the day. They're highest in the morning, just before waking up, and lowest at night.

Some people, however, can't make enough cortisol because they lack an enzyme in the adrenal glands that's needed to make it. They'll have a buildup of 17-hydroxyprogesterone in the blood because it's not being converted to cortisol.

In kids, the most common cause of cortisol deficiency, and consequently high levels of 17-hydroxyprogesterone, is one of the forms of the genetic disorder congenital adrenal hyperplasia (CAH).

CAH can affect both boys and girls. It causes the adrenal glands to make excess androgens (male steroid hormones) and, in some cases, not enough of the hormones that regulate the body's salt balance.

Though treatable, undetected CAH can sometimes lead to more serious symptoms such as dehydration and shock in infants.

Primary aldosteronism should be suspected whenever a patient has the triad of hypertension, hypokalemia, and inappropriate renal potassium wasting. The biggest challenge is the differential diagnosis between the more common adrenal adenoma and bilateral hyperplasia. Because adrenal adenomas increase the circulating levels of 18-hydroxycorticosterone (18-OH B), serum levels of 18-OH B may be useful to differentiate them from bilateral adrenal hyperplasia. The cutoff point appears to be about 50 ng/dL of serum. Most values are around 100 ng/dL. The higher the level of this precursor, the greater the possibility that an adrenal adenoma is present. J Clin Endocrinol Metab.

There are different types of cortisol tests that may be performed, including blood, saliva, and urine tests. The urine test is done over a period of 24 hours.

The cortisol urine test tends to be more comprehensive than the other types of cortisol tests. It measures the total amount of cortisol excreted into the urine over a 24-hour period. Blood tests or saliva tests, however, only measure cortisol levels at a particular time of day. Some people also find blood tests to be stressful, and since the body releases more cortisol during times of stress, the results may not be as precise. In some cases, your doctor may order both a cortisol urine test and another type of cortisol test to obtain more accurate results.

Cushing’s syndrome is a collection of symptoms associated with high cortisol levels. The most common symptoms include:

1.Increased urination

2.Increased thirst

3.Fatty tissue deposits, especially in the midsection and upper back

4.Pink or purple stretch marks on the skin

5.Weight gain

6.Fatigue

7.Muscle weakness

8.Thinning skin that bruises easily

9.Women may have irregular periods and excess facial and chest hair. Children may show delayed physical or cognitive development.

The symptoms of low cortisol levels often emerge slowly. At first, they may only appear during times of extreme stress, but they’ll gradually increase in intensity over several months. Potential symptoms include:

1.Weight loss

2.Fatigue

3.Dizziness

4.Fainting

5.Muscle weakness

6.Abdominal pain

7.Diarrhea

8.Constipation

When cortisol levels abruptly drop to life-threatening levels, an acute adrenal crisis may occur. The symptoms of an acute adrenal crisis include:

1.Darkening of the skin

2.Extreme weakness

3.Vomiting

4.Diarrhea

5.Fainting

6.Chills

7.Loss of appetite

8.Sudden onset of severe pain in the lower back, abdomen, or legs.

Testosterone plays a central role in male development and health. Likewise, androgen deficiency, or hypogonadism, is associated with a variety of symptoms including decreased energy, diminished libido and erectile dysfunction, among others. Male androgen levels steadily decline with age, and, in a subset of symptomatic older men, can result in late-onset hypogonadism (LOH). Over the last decade, increased awareness of hypogonadism among patients and providers has led to a significant rise in the use of testosterone replacement therapy (TRT) for hypogonadism, and especially in LOH. Accompanying the rise in TRT are concerns of potential adverse effects, including cardiovascular risks and the promotion of prostate cancer. The ‘androgen hypothesis’ asserts that prostate cancer development and progression is driven by androgens, and thus TRT has the theoretical potential to drive prostate cancer development and progression. In this review, we examine existing data surrounding testosterone and prostate cancer. There is significant evidence that androgens promote prostate cancer in experimental systems. However, there is no clear evidence that elevations in endogenous testosterone levels promote the development of prostate cancer in humans. As a result of experimental and historical data on the progression of prostate cancer following TRT, there has been widespread belief that TRT will promote disease progression in prostate cancer patients. Despite these fears, there are a growing number of studies demonstrating no increase in prostate cancer incidence among men on TRT. Furthermore, in studies involving a small number of patients, there has been no discernable increase in disease progression in prostate cancer patients on TRT. While data from large, prospective, randomized, controlled trials are absent, TRT in select prostate cancer patients is likely safe. In the end, the use of TRT in prostate cancer patients is still considered experimental and should only be offered after well-informed shared decision making and with close monitoring.

This test finds out how much 5-hydroxyindoleacetic acid (5-HIAA) is in your urine.

Your liver breaks down the hormone serotonin into 5-HIAA. This waste product is normally sent from your body in your urine. Tumors called functioning carcinoids secrete serotonin. Carcinoid tumors are found in the intestinal tract, lungs, appendix, and other body tissues. Because serotonin in the blood is broken down very quickly, the amount of 5-hydroxyindoleacetic acid collected in the urine over a full day more accurately reflects the rate at which serotonin is being made than the blood level at one particular time. 

ENT physicians must complete about 15 years of education and training, including a 4-year undergraduate program, 4-year medical program, at least 5 years of specialty training and a 1- to 2-year residency program (e.g., General Surgery). Then, physicians must undergo peer evaluations and pass oral and written examinations administered by the American Board of Otolaryngology.

After attaining board certification, otolaryngologists may pursue a one- or two- year fellowship for extensive training and examinations in a subspecialty area. Otolaryngology subspecialties include:

Allergy
Facial Plastic and Reconstructive Surgery
Head and Neck Surgery
Laryngology
Otology/Audiology
Pediatric Otolaryngology
Rhinology
Neurotology
Sleep Medicine
Board certification is valid for 10 years. To revalidate their certification, ENTs must meet guidelines established by the American Board of Medical Specialties and complete a Maintenance of Certification Program. This process emphasizes professional standing, lifelong learning and self-assessment, cognitive expertise and evaluation of performance in practice.

Valid certificate issued by the American Board of Otolaryngology
Valid, unrestricted medical license
Privileges to practice otolaryngology-head and neck surgery in accredited hospital or surgical center
Completion of required CME credits
Successful completion of the American Board of Otolaryngology self-assessment module
Maintenance of Certification Examination

Most of the time blood is drawn from a vein on the inside of the elbow or the back of the hand. The site is cleaned with an antiseptic. The health care provider wraps an elastic band around your upper arm to make the vein swell with blood.

Next, the provider gently inserts a needle into the vein. The blood collects into an airtight tube attached to the needle. The elastic band is removed from your arm. The needle is then removed and the site is covered to stop bleeding.