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Anal fistula — An anal fistula is an abnormal, narrow, tunnel-like passageway that connects the remains of an oldanal abscess to the surface of the skin.
Anal stricture — An anal stricture is a tight band of scar tissue that constricts the anal opening, interfering with the ability to pass stool comfortably.
Anal strictures can be caused by radiation treatment for cancers located near the anal area, some sexually transmitted diseases, direct trauma to the anus or, rarely, surgery to remove hemorrhoids.
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 colonic and rectal (colorectal) surgeon.
Anal fissure is the most common cause of rectal bleeding in infancy.
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