One of the most common anorectal disorders, an anal fissure is a linear tear in the anal skin most commonly caused by passage of a large, hard stool.
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An anal fissure is a tear in the anal skin most commonly caused by passage of a large, hard stool. Fissures can also occur with severe bouts of diarrhea or inflammation. This results in the anus becoming dry and irritated, causing it to tear. Injury to the anal area during childbirth may be another cause.