Definitions Ulcerative colitis is a continuous inflammation and ulceration of the colon and rectum and typically involves only the innermost lining or mucosa, with no segments of normal tissue Crohn's disease is a chronic, relapsing, focal asymmetric, transmural inflammation of the gut anywhere between the mouth and the anus but is predominantly seen in the terminal ileum and/or colonUlcerative colitis is a continuous inflammation and ulceration of the colon and rectum and typically involves only the innermost lining or mucosa, with no segments of normal tissue. Crohn’s disease is a chronic, relapsing, focal, asymmetric, transmural inflammation of the gut anywhere between the mouth and the anus, but is predominantly seen in the terminal ileum and/or colon. Definitions