The barium enema — colon X-ray — is used to detect changes or abnormalities in your colon. During the exam, liquid barium — and in some cases air — is inserted into your colon through the rectum.

Colonoscopy (koh-luh-NAH-skuh-pee) lets the physician look inside your entire large intestine, from the lowest part, the rectum, all the way up through the colon to the lower end of the small intestine.

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Colorectal cancer, more usually known as colon cancer, is the third most common form of cancer (lung cancer being the most common).

Smokers run a greater risk of developing colorectal polyps, and they should be screened at an earlier age.

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