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The anus is the opening of the rectum through which stool passes out of your body. Problems with the anus are common. They include hemorrhoids, abscesses, fissures (cracks), and cancer.
Many people are embarrassed to talk about anal troubles. But seeing your doctor about problems in this area is important. This is especially true if you have pain or bleeding. Treatments vary widely depending on the particular problem.
NIH: National Institute of Diabetes and Digestive and Kidney Diseases