Learn about this cancer that affects the anal canal and causes bleeding and pain. Treatment is usually with a combination of radiation and.
Sometimes anal cancer causes no symptoms at all. At first, most people assume the bleeding is caused by hemorrhoids (painful, swollen veins in the anus and rectum that may bleed). They are a benign and fairly common cause of rectal bleeding.
Anal cancer is a relatively rare cancer and more common in females than in males. The human papilloma virus is a major risk factor. Learn.