Anal cancer is a type of cancer that forms in tissues of the anus. The anus is the opening of the rectum to the outside of the body and at the end of the GI tract. Sometimes anal cancer causes no symptoms at all. But bleeding is often the first sign of the disease. The bleeding is usually minor.
Muscles anal sphincters that surround the anal canal relax to allow waste to leave your body. Anal cancer is an uncommon type of cancer that occurs in the anal canal. The anal canal is a short tube at the end of your rectum through which stool leaves your body. Most people with anal cancer are treated with a combination of chemotherapy and radiation.
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.