Colorectal cancer occurs when malignant cells form tumors in the healthy tissues of the digestive tract, namely the colon or rectum. Colon cancer develops in the cells that colonize the colon and occurs when cells at this level, normally routinely, begin to grow uncontrollably, forming tumors.

Colon cancer most often develops from polyps, non-cancerous formations that can develop into the inner wall of the colon or rectum as they age. If not treated, polyps can turn into cancerous tumors. Recognition and removal of precancerous polyps can prevent colorectal cancer. 

Colon cancer can spread to other organs near the colon such as the bladder, uterus or prostate. Specialists are of the opinion that these colon and rectal cancers need 5-10 years to develop.