RT Journal A1 Torpy JM, Lynm C, Golub RM T1 ULcerative colitis JF JAMA JO JAMA YR 2012 FD January 4 VO 307 IS 1 SP 104 OP 104 DO 10.1001/jama.2011.1889 UL http://dx.doi.org/10.1001/jama.2011.1889 AB Inflammatory bowel diseases (IBD) such as ulcerative colitis and Crohn disease make the bowel (intestine ) inflamed, irritated, swollen, and unable to function in a healthy way. Ulcerative colitis affects the large intestine (the colon) and the rectum but does not involve the small intestine (the part of the bowel that connects the stomach to the colon and that is responsible for almost all the body's food digestion and absorption of nutrition). Crohn disease affects both the small intestine and the colon.