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Anal Fissure

  • Definition

    An anal fissure is a cut or tear in the lining of the anus. The anus is the opening through which stool leaves the body. Tears generally occur just inside the opening.
    Anal Fissure
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  • Causes

    The exact cause of an anal fissure is unknown. In most cases, tearing is the result of trauma to the anal lining. Trauma can be caused by:
    • A large, dry, or hard stool
    • Frequent diarrhea
    • Tightened anal sphincter, a group of muscles that open and close the anus
    • Childbirth
    • Anal irritation
  • Risk Factors

    Factors that may increase your chance an anal fissure include:
  • Symptoms

    Anal fissure may cause:
    • Pain during and after a bowel movement
    • Burning sensation during a bowel movement
    • Bleeding with bowel movements that result in bright red blood either on the toilet tissue or in the bowl
    • Small amounts of mucous may be present
    Apprehension about bowel movement pain may cause you to delay bowel movements. This can make the symptom worse.
  • Diagnosis

    The doctor will ask about your symptoms and medical history. A physical exam will be done. Anal fissures are generally visible, so diagnosis can be made with an anal exam. If it is not visible, but suspected, your doctor may need to do other tests as long as it is not too painful. These tests include:
    • Digital rectal exam—to feel for any lumps or abnormalities
    • Anoscopy—examination of the anal canal with a scope
    Fissures usually occur in predictable locations around the anus. If there are multiple cuts, or a cut in an unusual location, the doctor may order additional tests to look for other conditions.
  • Treatment

    Treatment aims to heal the cut and prevent future anal problems. Most fissures heal on their own or with self-care. Fissures that are fairly new are easier to heal than ones that have persisted for longer than 3 months.
    Treatments include:
    Fissures may heal by changing some of your daily habits. These include:
    • Warm sitz baths, especially after bowel movements, to help relieve pain and promote healing
    • Increasing dietary fiber intake
    • Increasing fluid intake
    • Using stool softeners or bulk laxatives
    Your doctor may prescribe:
    • Topical medications to reduce pain and inflammation
    • Topical nitrates and calcium channel blockers to increase blood flow to the anus and promote healing
    • Injected botulinum toxin to relax tightened anal sphincter muscles
    Surgery may be necessary for:
    • Fissures that do not heal with other treatment methods
    • Scar tissue or spasms in the anal sphincter muscles that may also delay healing
    • Recurrent fissures
    Surgical procedures include:
    • Lateral internal sphincterotomy—A tiny incision is made in the sphincter muscle fibers to prevent spasms that result in straining during a bowel movement.
    • Fissurectomy—Excision of the fissure.
    • Anal advancement flap—Covering the fissure with tissue from another part of the body.
    • Anal dilation—Rare procedure that widens and stretches the anal canal.
  • Prevention

    To help reduce the chance of an anal fissure:
    • Drink plenty of fluids throughout the day
    • Exercise regularly
    • Eat foods high in fiber, such as fruits, vegetables, legumes, and whole grains
    • Avoid straining during bowel movements
    • Follow your treatment plan if you have Crohn's disease or ulcerative colitis

    American College of Gastroenterology

    American Society of Colon and Rectal Surgeons


    Canadian Association of Gastroenterology

    Canadian Society of Colon and Rectal Surgeons


    Anal fissure. American Society of Colon & Rectal Surgeons website. Available at: Updated October 2012. Accessed November 9, 2015.

    Anal fissure. EBSCO DynaMed website. Available at: Updated July 9, 2015. Accessed November 9, 2015.

    Fargo M, Latimer K. Evaluation and management of common anorectal conditions. Am Fam Physician. 2012;85(6):624-630.

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