Polyps are abnormal growths rising from the lining of the large intestine (colon) and protruding into the intestinal canal (lumen). Some polyps are flat; others have a stalk. Polyps are one of the most common conditions affecting the colon and rectum, occurring in 15-20 percent of the adult population. Although most polyps are benign, the relationship of certain polyps to cancer is well established. Most polyps produce no symptoms and often are found incidentally during endoscopy or x-ray of the bowel. Some polyps, however, can produce bleeding, mucous discharge, alteration in bowel function, or in rare cases, abdominal pain.
