Ulcerative colitis (uc) is one of the two types of inflammatory bowel disease (ibd), with the other type being crohn's disease.. Ulcerative colitis is an inflammatory bowel disease that causes chronic inflammation and ulcers in the superficial lining of the large intestine, also called the colon.
It affects the inner lining of the colon and rectum, causing complete damage to the lining.. It typically begins in the rectum and spreads to the.