The anus is the opening at the end of the bowel. It is made up of the last few centimetres of the bowel anal canal and the skin around the opening anal margin. During a bowel motion, the muscles of the anus sphincters relax to release the solid waste matter known as faeces or stools. Anal cancer is cancer affecting the tissues of the anus. Our body constantly makes new cells to help us grow, replace worn-out tissue and heal injuries. Normally cells multiply and die in an orderly way.
Back to Health A to Z. Anal cancer is a rare type of cancer that affects the anus the end of the bowel. The symptoms of anal cancer are often similar to more common and less serious conditions affecting the anus, such as piles haemorrhoids and small tears or sores called anal fissures. See a GP if you develop any of these symptoms.
Find information and resources for current and returning patients. Learn about clinical trials at MD Anderson and search our database for open studies. The Lyda Hill Cancer Prevention Center provides cancer risk assessment, screening and diagnostic services. Your gift will help support our mission to end cancer and make a difference in the lives of our patients. Our personalized portal helps you refer your patients and communicate with their MD Anderson care team.
The anal canal is a short tube surrounded by muscle at the end of your rectum. The rectum is the bottom section of your colon large intestine. When you have a bowel movement, stool leaves your body from the rectum through the anal canal.