Anal Tear Underlying Cause
Most anal fissures are caused by large, hard pieces of stool that tear the skin of the anus during a bowel movement.
Additional causes of anal fissure include:
- Anal intercourse
- Anal injury
- Vigorous wiping
Continue to Anal Tear Anatomy
- Jonas M, Scholefield J. Anal fissure (chronic). Clin Evid. 2004 Dec;(12):581-90. 
- Lawes D, Taylor I. Recent randomised trials in colorectal disease. Colorectal Dis. 2005 Jan;7(1):8-17. 
- Nelson R. Operative procedures for fissure in ano. Cochrane Database Syst Rev. 2005 Apr 18;(2):CD002199.