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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. Photo of a cancer cellalthough some people equate anal cancer with cancer of the colon, the two diseases are distinct and considered to be unrelated. While colon and rectal cancers can be similar and are often referred to collectively as colorectal cancer, anal cancer is completely different in significant ways, including the cell type where cancer begins, the cause of the cancer, who gets this cancer, and how we treat it. Anal cancer is more similar to cervical cancer because the tissue. 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. Colon cancer can start anywhere in the colon, which is about 5 feet long and absorbs water from stool. Rectal cancer starts in the rectum, which is the last 12 centimeters (nearly 5 inches) of the. Anal cancer accounts for about 1-2 of all cancers of the intestines. Far less common than colorectal cancer, anal cancer affects about one in 500 people in their lifetime versus one in 22 people. The number of anal cancer cases has been steadily growing for years.

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