Of unknown cause or origin.
inflammatory bowel disease
Comprised of 3 different chronic disease entities: ulcerative colitis, Crohn's disease and indeterminant colitis. This group of diseases manifest from immune dysregulation, may be localized to the small or large bowel and is complex in origin.
irritable bowel syndrome
(IBS) û considered a 'functional gut disorder' that is complex in nature, and involves altered motility or movement of the gut (enteric nervous system) and pain sensation (visceral hypersensitivity). It is defined by completely normal investigations, in the context of chronic (>3mo) abdominal discomfort, often relieved with defecation (bowel movement) and altered bowel habit (alternating between diarrhea and constipation).