LYCOS RETRIEVER 
Colitis: Rectum
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Ulcerative colitis is a disease that causes ulcers in the lining of the rectum and colon. It is one of a group of diseases called inflammatory bowel disease. Ulcers form where inflammation has killed the cells that usually line the colon.
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Ulcerative colitis and Crohn's disease are the most common types of inflammatory bowel disease. Ulcerative colitis affects only the colon and rectum. Crohn’s can affect any part of the digestive tract. To learn more about Crohn’s disease, see the topic Crohn’s Disease.
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Ulcerative colitis is a chronic, recurring disease of the large bowel. The large bowel (colon) is the 5 to 6 foot segment of intestine that begins in the right-lower abdomen, extends upward and then across to the left side, and downward to the rectum. It dehydrates the liquid stool that enters it and stores the formed stool until a bowel movement occurs.
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The cause of ulcerative colitis is not known. Inflammatory bowel diseases (ulcerative colitis and Crohn's disease) seem to run in some families. Some researchers think that a virus or bacteria causes the immune system to overreact and damage the colon and rectum.
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Ulcerative colitis is a chronic inflammation of the tissue lining the large intestine (the colon and rectum). Ulcers, or sores, develop in the outermost layer of the lining but, unlike Crohn’s disease, the inflammation does not penetrate into the deeper tissue layers.
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Ulcerative colitis usually affects only the innermost lining of your large intestine (colon) and rectum. It occurs only through continuous stretches of your colon, unlike Crohn's disease, which occurs in patches anywhere in the digestive tract and often spreads deep into the layers of affected tissues.
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