At first, most people assume the bleeding is caused by hemorrhoids (painful, swollen veins in the anus and rectum that may bleed). 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. 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. 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 is cancer that arises in the anus, the end of the intestinal tract where stool (feces) exits the body. The cancer can begin either in the lining of the anus or in the skin surrounding the anus. Anal cancer is different from colon or rectal cancer, which arises in the other parts of the large intestine. Risk factors for developing anal cancer include infection with certain types of. With anal cancer, malignant cells grow in the tissues of the anus. Infection with the human papillomavirus (hpv) increases your risk. A lump near the anus, anal discharge, bleeding, itching, and pressure are signs and symptoms. 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. The most common symptom associated with anal cancer is bleeding. Because anal itching can also be a symptom of the cancer, many people initially attribute their bleeding and itching to hemorrhoids. A big problem is that anal cancer can grow in persons body, without causing any symptoms or can look like hemorrhoids and irritable bowel syndrome. Rectal bleeding nearly 80 of patients with anal cancer have this symptom.