What causes anal fissures?

Updated: Nov 28, 2018
  • Author: Lisa Susan Poritz, MD; Chief Editor: John Geibel, MD, DSc, MSc, AGAF  more...
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The exact etiology of anal fissures is unknown, but the initiating factor is thought to be trauma from the passage of a particularly hard or painful bowel movement. Low-fiber diets (eg, those lacking in raw fruits and vegetables) are associated with the development of anal fissures. No occupations are associated with a higher risk for the development of anal fissures. Prior anal surgery is a predisposing factor because scarring from the surgery may cause either stenosis or tethering of the anal canal, which makes it more susceptible to trauma from hard stool. [1]

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