Anal Sphincterotomy

(Sphincterectomy, Anal; Surgery for Anal Fissures; Lateral Internal Sphincterotomy; LIS)

Pronounced: A-nul Sfink-ter-ot-o-me



This is a procedure to treat chronic anal fissures. An anal fissure is a painful tear in the lining of the anus. The anus is the opening through which stool passes from the body. Tears generally occur just inside the opening.

Anal Fissure

Copyright © Nucleus Medical Media, Inc.

Reasons for Procedure

Reasons for Procedure

Muscle spasms in the rectum can prevent fissures from healing. A sphincterotomy relieves these muscle spasms. Anal fissures often heal by taking certain steps, such as:

  • Eating a high-fiber diet
  • Drinking plenty of fluids
  • Using stool softeners
  • Taking warm baths
  • Using medications applied to the skin

When these do not work, a sphincterotomy may be done. This procedure allows the fissure to heal and decreases pain and spasms. Pain will begin to go away within a few days.

Possible Complications

Possible Complications

Problems from the procedure are rare, but all procedures have some risk. Your doctor will review potential problems, like:

  • Inability to control the leakage of gas or stool from the rectum
  • Adverse reaction to anesthesia
  • Infection
  • Bleeding
  • Anal abscess or fistula formation

Before your procedure, talk to your doctor about ways to manage factors that may increase your risk of complications such as:

What to Expect

What to Expect

Prior to Procedure

Before surgery, your doctor may do the following determine the extent of your fissure:

  • Physical exam and health history
  • Digital rectal exam—The doctor inserts a lubricated finger into the anus and feels for lumps or abnormalities.
  • Anoscopy—A tool is inserted in the anus to allow the doctor to examine the anal canal.

In the days leading up to the surgery, your doctor may:

  • Ask you to take steps to clean out your bowels.

    • The day before the surgery:

      • Eat a light breakfast and lunch.
      • Drink clear liquids only after lunch. Clear liquids include items such as water, broth, juices without pulp, popsicles, and clear Jell-O. Talk to your doctor about which liquids are allowed.
    • Do not eat or drink after midnight the night before surgery:
    • You may also be asked to give yourself an enema to help clean out your bowel.

You should also talk to your doctor about your medications, herbs, and dietary supplements. You may be asked to stop taking some medicines up to one week before the procedure.


Depending on which option is best for you, your doctor may give you:

  • Local anesthesia that will only numb the rectal area
  • General anesthesia—You will be asleep during the surgery.

Description of Procedure

If there are any skin tags near the fissure, they will be removed. Next, the doctor will carefully make a cut on the anal sphincter muscle. This will relax the sphincter and allow it to stretch, taking pressure off the fissure. The doctor will put a dressing into your anus to stop the bleeding.

How Long Will It Take?

Less than one hour

How Much Will It Hurt?

Anesthesetics will prevent pain during the procedure. Pain and discomfort after the procedure can be managed with medications.

Post-procedure Care

At the Care Center

You may be given pain medications and instructions for how to care for your rectal area. A nurse may change your dressing or instruct you on how to change it.

Preventing Infection

During your stay, the care center staff will take steps to reduce your chance of infection, such as:

  • Washing their hands
  • Wearing gloves or masks
  • Keeping your incisions covered

There are also steps you can take to reduce your chance of infection, such as:

  • Washing your hands often and reminding your healthcare providers to do the same
  • Reminding your healthcare providers to wear gloves or masks
  • Not allowing others to touch your incision

At Home

When you return home, you will need to take steps to promote healing and prevent infection. These will include:

  • Keeping the rectal area clean
  • Using a sitz bath to ease discomfort and cleaning
  • Avoiding sexual activity and heavy lifting until your doctor says it is okay

Your doctor may advise:

  • Over-the-counter or prescription pain relievers
  • Stool softeners and dietary changes to prevent constipation

Call Your Doctor

Call Your Doctor

It is important to monitor your recovery. Alert your doctor to any problems. If any of the following occur, call your doctor:

  • Large amounts of bleeding from the rectum
  • Fever
  • Foul-smelling drainage from the rectum
  • Excessive swelling in the rectal area
  • Inability to control bowel movements
  • Difficulty urinating

If you think you have an emergency, call for medical help right away.


American Society of Colon and Rectal Surgeons

Family Doctor—American Academy of Family Physicians


Canadian Society of Colon and Rectal Surgeons

The College of Family Physicians of Canada


Anal fissure. American Society of Colon and Rectal Surgeons website. Available at:
Updated October 2012. Accessed May 28, 2013.

Anal fissure. EBSCO DynaMed website. Available at:
Updated November 20, 2012. Accessed May 28, 2013.

Anal fissure treatments. University of Wisconsin School of Medicine and Public Health, UW Health website. Available at:
Updated April 24, 2013. Accessed May 28, 2013.

Anal fissures. Cleveland Clinic website. Available at:
Updated April 19, 2010. Accessed May 28, 2013.

Anal fissures. University of California San Francisco Medical Center website. Available at:
Accessed May 28, 2013.

6/6/2011 DynaMed’s Systematic Literature Surveillance
Mills E, Eyawo O, et al. Smoking cessation reduces postoperative complications: a systematic review and meta-analysis. Am J Med. 2011;124(2):144-154.

Last reviewed January 2015 by Daus Mahnke, MD
Last Updated: 5/8/2014

Leave a Reply