Anal fissure postpartum Anal fissure can occur in pregnancy. During pregnancy, women often experience constipation due to the increased weight of the baby putting pressure on the rectum, the final segment of the digestive system, which stores feces until a person is ready to defecate. Childbirth causes anal fissure in about one in 10 women. Other anal fissure causes Other possible causes of anal fissure include:   Persistent diarrhea A sexually transmitted infection, such as anal herpes or chlamydia , which cause the tissues to become soft and fragile Inflammatory bowel disease IBD , meaning ulcerative colitis or Crohn's disease Trauma, for instance from rough or inadequately lubricated anal intercourse, or other insertion of foreign objects Unusually tight anal sphincter muscles or anal spasm Previous anal surgery Anal cancer can have similar symptoms to benign anal fissure Certain other cancers, e. They are associated with tight anal sphincter muscles, though the cause of this is unknown.
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. 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. Anal fissures can occur at any age, but are more common in infants and middle-aged adults.
Insertion of foreign objects into the anus Causes other than trauma include: Longstanding poor bowel habits Overly tight or spastic anal sphincter muscles muscles that control the closing of the anus Scarring in the anorectal area An underlying medical problem, such as Crohn's disease and ulcerative colitis types of inflammatory bowel disease ; anal cancer ; leukemia ; infectious diseases such as tuberculosis ; and sexually transmitted diseases such as syphilis , gonorrhea , Chlamydia , chancroid, HIV Decreased blood flow to the anorectal area Anal fissures are also common in young infants and in women after childbirth. What are the signs and symptoms of an anal fissure? Signs and symptoms of an anal fissure include: Pain during, and even hours after, a bowel movement Constipation Blood on the outside surface of the stool Blood on toilet tissue or wipes A visible crack or tear in the anus or anal canal Burning and itching that may be painful Discomfort when urinating, frequent urination, or inability to urinate Foul-smelling discharge.