Colorectal cancer is a disease in which cancer cells grow in the colon and/or rectum. The colon and the rectum are parts of the large intestine, which is part of the digestive system.
Cancer occurs when cells in the body (in this case colon or rectum cells) divide without control or order. Normally, cells divide in a controlled manner. If cells keep dividing uncontrollably, a mass of tissue, called a growth or tumor, forms. The term cancer refers to malignant tumors, which can invade nearby tissue and spread to other parts of the body. A benign tumor does not invade or spread.








