
Indigestion (dyspepsia) is a functional disease in which the gastrointestinal (GI) organs, primarily the stomach and first part of the small intestine (and occasionally the esophagus), function abnormally. It is a chronic disease in which the symptoms fluctuate in frequency and intensity usually over many months or years. It may occur every day or intermittently for days or weeks at a time followed by days or weeks of relief (a pattern referred to as periodicity).