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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 an uncommon malignancy that starts in the anus-- the opening at the end of the rectum. The american society of clinical oncology estimates that 8,300 cases of anal cancer will be. Anal cancer is rare and more likely to affect women than men. About 25 percent of people diagnosed with anal cancer never experience any symptoms, while others experience a variety. In some cases, symptoms do not appear until the cancer has spread. 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. Early detection of anal cancer is common because these tumors develop in a part of the digestive tract that doctors are able to see and reach. Symptoms of early-stage anal cancer often prompt patients to visit their doctor, though not everyone experiences symptoms. More than half of patients with anal cancer experience rectal bleeding, which is often the first indication of the disease. Symptoms of anal cancer can include bleeding, bowel changes and severe itching (pruritus). They can also be symptoms for other conditions such as piles (haemorrhoids), but its important to see your doctor. The most common symptom of anal cancer is bleeding from the back passage (rectal bleeding). Anal cancer symptoms can be similar to those of hemorrhoids, irritable bowel syndrome (ibs), and many gastrointestinal diseases. More than 90 of anal cancer cases are believed to be caused by the human papillomavirus (hpv). The symptoms of anal cancer are often similar to more common and less serious conditions affecting the anus, such as piles (haemorrhoids) and anal fissures (small tears or sores).