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Causes of Anal fistula

An anal fistula is usually caused as a complication of an anal abscess (a collection of pus and mucus in one of the glands near to the anus) that has burst. It may also occur after incomplete surgical drainage of an abscess. The reason why some people get abscesses is unknown.

Anal fistulas are also associated with conditions that result in inflammation of the intestines. These include IBS, diverticulitis, ulcerative colitis, Crohn's disease, tuberculosis, gonorrhea, and rarely, cancer of the rectum.

Bacteria that normally occur in the rectum may cause recurrent abscesses to form.

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