Anal fissure surgery

About anal fissure surgery

Anal fissure surgery is used to treat anal fissure. An anal fissure is a small tear or ulcer (open sore) in the skin around the opening of your anus. The fissure can cause a sharp, searing or burning pain in or around your anus, especially when you open your bowels. This pain can last for a couple of hours after a bowel movement and is severe.

The internal and external anal sphincters are muscles that control the opening and closing of your anus by relaxing and tensing. Both muscles need to relax for you to have a bowel movement. You can tense or relax your external anal sphincter, but not your internal anal sphincter. Because of the pain of a fissure, your internal anal sphincter may go into spasm. This can increase the pressure within your anus, and make it even harder to have a bowel movement as well as preventing the fissure from healing.

Making a cut in your internal anal sphincter muscle stops it from going into spasm. This means you strain less when you go to the toilet and because of this, less stress is put on the fissure, giving it time to heal.

Illustration showing the anus with an anal fissure

What are the alternatives?

Anal fissure surgery is usually only recommended when other treatments are considered unsuitable or haven’t been effective. There are medicines you can try including the use of botulinum A toxin injections to produce a ‘chemical sphincterotomy’. Your doctor or surgeon should have already discussed these options with you and offered them before recommending anal fissure surgery.

Preparing for anal fissure surgery

Your surgeon will explain how to prepare for your operation. For example if you smoke you will be asked to stop, as smoking increases your risk of getting a chest and wound infection, which can slow your recovery.

Anal fissure surgery is usually done as a day case. This means you have the procedure and go home the same day.

The operation is usually done under general anaesthesia, which means you will be asleep during the operation. Alternatively, you may have the surgery under spinal or regional anaesthesia. This completely blocks pain from your waist down and you will stay awake during the operation. You may be given a sedative with regional anaesthesia, which relieves anxiety and helps you to relax.

You will be asked to follow fasting instructions. This means not eating or drinking, typically for about six hours beforehand. However, it’s important to follow your anaesthetist’s advice.

Your surgeon will discuss with you what will happen before, during and after your procedure, and any pain you might have. This is your opportunity to understand what will happen, and you can help yourself by preparing questions to ask about the risks, benefits and any alternatives to the procedure. This will help you to be informed, so you can give your consent for the procedure to go ahead, which you may be asked to do by signing a consent form.

Your nurse will prepare you for surgery. You may be asked to wear compression stockings to help prevent blood clots forming in the veins in your legs. You may need to have an injection of an anticlotting medicine called heparin as well as, or instead of, wearing compression stockings.

What happens during anal fissure surgery?

There are several different surgical techniques available to treat anal fissures.

Lateral internal sphincterotomy

This procedure has the best healing rate and is the most widely used procedure for anal fissures. In this operation, your surgeon will make a small cut in your internal anal sphincter muscle to the length of the fissure.


In this procedure your anal fissure is removed completely, leaving an open wound to heal naturally. This surgery can be used alone, with lateral internal sphincterotomy, or with medicines such as glyceryl trinitrate or botulinum A toxin injections. You may need to have a fissurectomy if you have an anal fistula (a tunnel-like structure between the skin around your anus and rectum) as well as an anal fissure.

Advancement flaps

The advancement flap is a technique that involves replacing the broken tissue in the fissure with healthy tissue. This type of surgery is more complex and is usually only recommended when other surgical options have been unsuccessful.

What to expect afterwards

You will need to rest until the effects of the anaesthetic have passed and you may need some pain relief to help with any discomfort.

You will usually be able to go home when you feel ready but sometimes you may need to stay in hospital overnight.

Your nurse will give you some advice about caring for your healing wounds before you go home. You may be given a date for a follow-up appointment.

You will need to arrange for someone to drive you home. Try to have a friend or relative stay with you for the first 24 hours.

Recovering from anal fissure surgery

If you need pain relief, you can take over-the-counter painkillers such as paracetamol or ibuprofen. You shouldn’t take any medicines that contain codeine because they can cause constipation. Always read the patient information that comes with your medicine and if you have any questions, ask your pharmacist for advice.

General anaesthesia and sedation temporarily affects your co-ordination and reasoning skills, so you must not drive, drink alcohol, operate machinery or sign legal documents for 24 hours afterwards. If you’re in any doubt about driving, contact your motor insurer so that you’re aware of their recommendations, and always follow your surgeon’s advice.

You will need to remove your wound dressing before having a bowel movement. Carefully wash and dry the area afterwards.

It can take several months to make a full recovery from anal fissure surgery, but this varies between individuals, so it’s important to follow your surgeon’s advice.

What are the risks?

As with every procedure, there are some risks associated with anal fissure surgery. We have not included the chance of these happening as they are specific to you and differ for every person. Ask your surgeon to explain how these risks apply to you.


Side-effects are the unwanted but mostly temporary effects you may get after having the procedure. After anal fissure surgery, you will feel sore and may find it difficult to sit down comfortably until the wound heals fully.


Complications are when problems occur during or after the operation. Most people are not affected. Complications of anal fissure surgery include:

  • infection – this can usually be treated with antibiotics, but occasionally can progress into an anal abscess and need further surgery
  • anal fistula – this can be treated with surgery
  • damage to your anal sphincter muscles – this may affect your bowel control and can lead to incontinence
  • repeat fissure – it’s possible the fissure may come back after surgery

Speak to your doctor if you need more information.


Produced by Krysta Munford, Bupa Health Information Team, December 2012.

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