Rectal cancer is cancer in the rectum, the last part of the large intestine. It allows waste to pass through the anal canal and out of the body.

Treatment for rectal cancer depends on how early it is detected, or if the cancer has spread.

Cancer occurs when cells in the body divide without control or order. Eventually these uncontrolled cells form a growth or tumor. The term cancer refers to malignant growths. These growths invade nearby tissues and spread to other parts of the body. It is not clear exactly what causes these problems in the cells, but is probably a combination of genetics and environment.