What is the progression of initial minor tears in the anal mucosa to anal fissure?

Updated: Nov 28, 2018
  • Author: Lisa Susan Poritz, MD; Chief Editor: John Geibel, MD, DSc, MSc, AGAF  more...
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Initial minor tears in the anal mucosa due to a hard bowel movement probably occur often. In most people, these heal rapidly without long-term sequelae. In patients with underlying abnormalities of the internal sphincter, however, these injuries progress to acute and chronic anal fissures. Studies of the internal anal sphincter and of anal canal physiology have been performed with varied results, but at least one abnormality is likely present in the internal anal sphincter of many anal fissure patients.

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