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Anal fissure - Overview

Definition of Anal fissure:

An anal fissure is a small split or tear in the thin moist tissue (mucosa) lining the lower rectum (anus).

Causes, incidence, and risk factors:

Anal fissures are extremely common in young infants but may occur at any age. Studies suggest 80% of infants will have had an anal fissure by the end of the first year. The rate of anal fissures decreases rapidly with age. Fissures are much less common among school-aged children than infants.

In adults, fissures may be caused by constipation, the passing of large, hard stools, or by prolonged diarrhea. In older adults, anal fissures may be caused by decreased blood flow to the area.

Anal fissures are also common in women after childbirth and persons with Crohn's disease.

  • Reviewed last on: 9/21/2010
  • Todd Eisner, MD, Private practice specializing in Gastroenterology, Boca Raton, FL. Clinical Instructor, Florida Atlantic University School of Medicine. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

Danakas G. Anal fissure. In: Ferri FF, ed. Ferri's Clinical Advisor 2008: Instant Diagnosis and Treatment. 1st ed. Philadelphia, Pa: Mosby; 2008.

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