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Common causes of an anal fissure include constipation and straining or passing hard or large stools during a bowel movement. Anal fissures typically cause pain and bleeding with bowel movements. You also may experience spasms in the ring of muscle at the end of your anus called the anal sphincter.
https://www.mayoclinic.org/diseases-conditions/anal-fissure/symptoms-causes/syc-20351424
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