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Colorectal polyps and cancer

Cancerous and precancerous growths

Colorectal polyps and cancer occur in the large intestine and colon. Polyps are precancerous growths in the intestine.


Abdominal pain; blood in stools or black tar-like stools; diarrhea; constipation or other change in bowel habits; intestinal obstruction; narrow stools; unexplained anemia; weight loss with no known reason.


May include a test for blood in the stool, endoscopic examinations of the inside of the intestine, and blood tests for anemia and liver function tests.


May require chemotherapy, surgery to remove all or part of the cancer, and radiation therapy.