Chronic or recurrent gastrointestinal disorders without an identifiable structural or biochemical explanation by the routine diagnostic tests. Functional gastrointestinal disorders are classified according to the presumed site of the disorder, such as IRRITABLE BOWEL SYNDROME, non-ulcer DYSPEPSIA, and non-cardiac CHEST PAIN.

Diseases in any segment of the GASTROINTESTINAL TRACT from ESOPHAGUS to RECTUM.

Synonyms: Cholera Infantum, Functional Gastrointestinal Disorder, Gastrointestinal Diseases, Gastrointestinal Disease, Gastrointestinal Disorders, Functional, Gastrointestinal Disorder, Functional, Gastrointestinal Disorders, Disease, Gastrointestinal, Gastrointestinal Disorder, Diseases, Gastrointestinal, Functional Gastrointestinal Disorders