An anal fissure is a narrow tear that extends from the muscles that control the anus (sphincters) up into the anal canal. These tears usually develop when anal tissue is damaged during a hard bowel movement or when higher-than-normal tension develops in the anal sphincters.
An anal fistula is a tubelike passage (tract) from the anal canal to a hole in the skin near the anus. This may occur after rectal surgery, after an abscess in the rectal area, or as a complication of a bowel disease.
Current as ofNovember 7, 2018
Author: Healthwise Staff Anne C. Poinier, MD - Internal Medicine Adam Husney, MD - Family Medicine C. Dale Mercer, MD - General Surgery
Medical Review:Anne C. Poinier, MD - Internal Medicine & Adam Husney, MD - Family Medicine & C. Dale Mercer, MD - General Surgery