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.
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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
diarrheaTightened anal sphincter, a group of muscles that open and close the anusChildbirthAnal irritation
Factors that may increase your chance an anal fissure include: ConstipationStraining to pass a bowel movementPrior anal surgery, which can cause scarring and decrease the tissue's elasticityChronic
Anal fissure may cause: Pain during and after a bowel movementBurning sensation during a bowel movementBleeding with bowel movements that result in bright red blood either on the toilet tissue or in the bowlSmall amounts of mucous may be present
Apprehension about bowel movement pain may cause you to delay bowel movements. This can make the symptom worse.
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 abnormalitiesAnoscopy—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 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.
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 healingIncreasing dietary fiber intakeIncreasing fluid intakeUsing stool softeners or bulk laxatives
Your doctor may prescribe: Topical medications to reduce pain and inflammationTopical nitrates and calcium channel blockers to increase blood flow to the anus and promote healingInjected botulinum toxin to relax tightened anal sphincter muscles
Surgery may be necessary for: Fissures that do not heal with other treatment methodsScar tissue or spasms in the anal sphincter muscles that may also delay healingRecurrent 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.
To help reduce the chance of an anal fissure: Drink plenty of fluids throughout the dayExercise regularly
high in fiber, such as fruits, vegetables, legumes, and whole grains
Avoid straining during bowel movementsFollow your treatment plan if you have Crohn's disease or ulcerative colitis
Anal fissure. American Society of Colon & Rectal Surgeons website. Available at: http://www.fascrs.org/patients/disease-condition/anal-fissure. Updated October 2012. Accessed November 9, 2015.
Fargo M, Latimer K. Evaluation and management of common anorectal conditions. Am Fam Physician. 2012;85(6):624-630.
Last reviewed November 2015 by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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