NCIt definition : A spectrum of small and large bowel inflammatory diseases of unknown etiology. It
includes Crohn's disease, ulcerative colitis, and colitis of indeterminate type.;
Alternative definition : NICHD: Chronic inflammatory process affecting the gastrointestinal tract; primarily
ulcerative colitis and Crohn's disease.; NCI-GLOSS: A general term that refers to the inflammation of the colon and rectum.
Inflammatory bowel disease includes ulcerative colitis and Crohn's disease.;