Colorectal cancer is cancer that starts in the colon or rectum. The colon and the rectum are parts of the large
intestine, which is the lower part of the body’s digestive system. During digestion, food moves through the stomach and small intestine
into the colon. The colon absorbs water and nutrients from the food and stores waste matter (stool). Stool moves from the colon into the
rectum before it leaves the body.
Most colorectal cancers are adenocarcinomas (cancers that begin in cells that make and release mucus and other fluids). Colorectal cancer
often begins as a growth called a polyp, which may form on the inner wall of the colon or rectum. Some polyps become cancer over time. Finding
and removing polyps can prevent colorectal cancer.