![]() In the United States, more than half of all anal abscesses occur in young adults between the ages of 20 and 40, and men are affected more often than women. They originate in a tiny anal gland, which enlarges to create a site of infection under the skin. Most anal abscesses are not related to other health problems and arise spontaneously, for reasons that are unclear. Acute (short-term) anal fissures are usually superficial and shallow, but chronic (long-term) anal fissures may extend deeper through the anoderm to expose the surface of underlying muscle.Īnal abscess - An anal abscess is a swollen, painful collection of pus near the anus. Less often, anal fissures develop because of prolonged diarrhea, inflammatory bowel disease or sexually transmitted diseases involving the anorectal area. Most anal fissures happen when a large, hard stool overstretches the anal opening and tears the delicate anoderm. This article describes four disorders that cause anal pain and irritation:Īnal fissure - An anal fissure, also called an anorectal fissure, is a linear split or tear in the lining ("anoderm") of the lower anal canal. There are blood vessels under the lining, and in its mid portion there are numerous tiny, anal glands. The lower half of the anal canal has sensitive nerve endings. In adults, the anus is 4 to 5 centimeters long. It is the final orifice through which stool passes out of the body. The anus is that part of the intestinal tract that passes through the muscular canal of the pelvis and anal sphincters. ![]()
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