Colorectal cancer happens when cells in your colon or rectum
grow abnormally and out of control. It may start as a polyp, or
small growth, in your colon or rectum. The cancer cells can
spread to other parts of your body. This cancer is also called
colon cancer or rectal cancer, depending on where the cancer is.
It is most common in people older than 50. Treatment works best
when the cancer is found early. Screening tests can help find
polyps and can find cancer that is still in its early stages and
hasn't spread yet. How this information was developed to help
you make better health decisions.