Risk factors

Factors that may increase your risk of developing an anal fissure include:

• Constipation. Straining during bowel movements and passing hard stools increase the risk of tearing.
• Childbirth. Anal fissures are more common in women after they give birth.
• Crohn's disease. This inflammatory bowel disease causes chronic inflammation of the intestinal tract, which may make the lining of the anal canal more vulnerable to tearing.
• Anal intercourse.
• Age. Anal fissures can occur at any age, but are more common in infants and middle-aged adults.