What is colon cancer?

Colon cancer is cancer of the colon, according to Mayo Clinic. Colon cancer is also known as colorectal cancer, which refers to cancers that start in the colon and rectum. The colon is a part of the digestive system also known as the large intestine.

Colorectal cancer typically begins as a polyp, which may become cancer, according to the American Cancer Society. Regular screening of the colon can identify a polyp before it becomes cancerous. The cancer begins in glands, growing inward. Colon cancer may also begin with tumors. Early-stage colon cancer can be treated with surgery, according to Mayo Clinic.