Colorectal cancer, also called colon cancer or large bowel cancer, is the third most common cancer in the United States. Colon cancer symptoms may include a change in bowel habits or bleeding, but usually colon cancer strikes without symptoms. Understand your risks and how your doctor can identify polyps before your life is at risk. New research seems to come out weekly about what you should or shouldn’t be eating, drinking, or doing to prevent it. Learn what you can do to lower your risk.