What Is It?
Colorectal cancer is an uncontrolled growth of abnormal cells in the colon and/or rectum.
Together, the colon and rectum make up the large intestine. The large intestine carries waste from the small intestine and eliminates it through the anus.
Colorectal tumors often begin as small growths (polyps) on the inside of the large intestine. Polyps that are not removed eventually can become cancerous.