A colonoscopy is most often performed to find and prevent tumors or polyps (precancerous growths) that can develop into colon cancer. It is a preventative technique that can be extremely effective in preventing, diagnosing and treating colon cancer. Secondly, a colonoscopy can be used to examine the cause of blood in the stool, abdominal pain, diarrhea, a change in bowel habits or other abnormality.
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