Anal fistula causes
Feb 15, An anal fistula is a tunnel that runs from inside the anus -- the hole your body uses to get rid of solid waste -- to somewhere in the skin around it.
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What are symptoms of fistula?
Description:Heart A fistula is an abnormal connection between an organ and another structure. Fistulas develop when an organ becomes inflamed or injured. Over half of fistulas form in this location. The second most common location is between 2 loops of intestine. Fistulas can also form between the: