What is the pathophysiology of pain in anal fissures?

Updated: Nov 28, 2018
  • Author: Lisa Susan Poritz, MD; Chief Editor: John Geibel, MD, DSc, MSc, AGAF  more...
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Pain accompanies each bowel movement as this raw area is stretched and the injured mucosa is abraded by the stool. The internal sphincter also begins to spasm when a bowel movement is passed. This spasm has two effects: First, it is painful in itself, and second, it further reduces the blood flow to the posterior midline and the anal fissure, contributing to the poor healing rate.

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