the exact cause of colorectal cancer is not known. most cases begin as small growths or polyps inside the colon or rectum. colon polyps are very common. very few of them turn into cancer. if they are found early usually through routine screening tests they can be removed before they turn into cancer. webmd medical reference from healthwise this information is not intended to replace the advice of a doctor. healthwise disclaims any liability for the decisions you make based on this information. © 1995-2011 healthwise incorporated. healthwise healthwise for every health decision and the healthwise logo are trademarks of healthwise incorporated.
what causes colorectal cancer?