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Anal Fissure »

What are anal fissures?

An anal fissure is a cut or tear occuring in the anus (the opening through which stool passes out of the body) that extends upwards into the anal canal. Fissures are a common condition of the anus and anal canal and are responsible for 6-15% of the visits to a colon and rectal (colorectal) surgeon. They affect men and women equally and both the young and the old. Fissures usually cause pain during bowel movements that often is severe. Anal fissure is the most common cause of rectal bleeding in infancy.

Anal fissures occur in the specialized tissue that lines the anus and anal canal, called anoderm. At a line just inside the anus--referred to as the anal verge or intersphincteric groove--the skin (dermis) of the inner buttocks changes to anoderm. Unlike skin, anoderm has no hairs, sweat glands, or sebaceous (oil) glands and contains a larger number of somatic sensory nerves that sense light touc...

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