http://www.healthfinder.gov/prevention/ViewTopic.aspx?topicID=26
National Health Information Center, U.S. Department of Health and Human Services
Cancer of the colon or rectum is called colorectal cancer. Colorectal cancer has no signs or symptoms and can spread to other parts of your body if undetected and untreated. Many cases can be prevented or cured if they are found early. If you are over 50, schedule a colorectal cancer test.