Anal Fissure Surgery

What this procedure is

The most common surgery for an anal fissure is called a lateral internal sphincterotomy. During this procedure, a surgeon makes a small, precise cut in the internal anal sphincter. This is the ring of muscle that helps keep the anal canal closed.

By making this small cut, the surgeon helps the muscle relax. This reduces the pressure and tension in the area. Your clinician may perform this while you are under anesthesia to ensure you are comfortable and do not feel pain during the process.

What it treats or fixes

This surgery is used to treat a chronic anal fissure. A fissure is a small tear in the lining of the anal canal. While many tears heal on their own, some become "chronic" if they last for several weeks or keep coming back.

Fissures often fail to heal because the internal muscle is too tight or in a state of spasm. This tightness limits blood flow to the tear. The surgery treats this by relaxing the muscle, which helps the pain go away and allows the body to repair the tear naturally.

How common it is & where it's done

Surgery is a common and well-established treatment for fissures that do not respond to fiber, stool softeners, or medicated creams. It is frequently performed by specialists known as colorectal surgeons.

The procedure is usually done in a hospital or an outpatient surgery center. In most cases, it is a "same-day" procedure, meaning you can go home shortly after the surgery is finished to recover in your own space.

Recovery: What to Expect

Most people find that the sharp pain they felt before surgery improves quickly. While you may have some mild discomfort for a few days, your clinician will provide ways to manage it. Full healing of the area usually takes about 6 to 10 weeks.

To help the healing process, your clinician may suggest:

• Sitz baths: Sitting in a few inches of warm water for 10 to 15 minutes several times a day to soothe the area.
• Fiber and fluids: Eating high-fiber foods and drinking plenty of water to keep stools soft and easy to pass.
• Stool softeners: Using gentle aids to prevent straining during bowel movements.

Risks & Possible Complications

Every procedure has some risks, though they are generally uncommon for this surgery. Some patients may experience minor bleeding or a small infection at the site. There is also a small risk of losing some control over gas or bowel movements (incontinence), which is often temporary as the body heals.

You should contact your care team if you notice any of the following:

• A fever or chills.
• Pain that gets worse instead of better over time.
• Bleeding that seems heavy or does not stop.

Outcomes & Long-Term Results

Surgery is often considered the most effective treatment for fissures that have not healed with creams or lifestyle changes. For many, it provides lasting relief from the cycle of pain and bleeding. Most people are able to return to their normal daily routine within a week or two.

To keep the area healthy in the future, it is important to prevent constipation. Continuing a high-fiber diet and staying hydrated can help ensure the fissure does not return. Your clinician may monitor your progress to ensure the muscle has relaxed enough to allow for permanent healing.

Emotional Support & Reassurance

It is completely natural to feel anxious about surgery in such a private and sensitive part of the body. Many patients feel a great sense of relief once the procedure is over because the chronic pain they lived with is finally addressed. Your medical team is there to ensure you are comfortable and to answer any questions you have.

Remember that this is a common procedure designed to help you get back to your life without discomfort. Taking this step is a positive move toward long-term healing and a better quality of life.

Why doctors recommend it

An anal fissure is a small tear in the lining of the anal canal. While many of these tears heal on their own with extra fiber or special creams, some become "chronic," meaning they last for six weeks or longer. Your clinician may recommend surgery if these non-surgical treatments have not provided enough relief.

In many cases, a chronic fissure causes the internal sphincter (the involuntary muscle around the anal opening) to go into a spasm. This spasm is a constant tightening that limits blood flow to the area. Without good blood flow, the body struggles to heal the tear. Surgery is often recommended to relax this muscle, which helps the pain stop and allows the healing process to begin.

Urgent vs planned treatment

Surgery for an anal fissure is almost always a planned, or elective, procedure. It is rarely considered an emergency. Because many fissures heal with home care, clinicians usually prefer to wait and see how you respond to high-fiber diets, stool softeners, or medicated ointments first.

You and your clinician will typically decide to move forward with a planned surgery if your symptoms are not improving after several weeks. While the timing is rarely urgent, your clinician may suggest scheduling the procedure sooner if the pain is severe enough to interfere with your daily activities or if the fissure is causing significant distress.

Goals of treatment

The primary goal of surgery is to break the cycle of pain and muscle spasms. By carefully relaxing a small portion of the anal muscle, the procedure aims to achieve the following:

• Pain Relief: Reducing the tension in the muscle helps to significantly lower the sharp pain often felt during and after bowel movements.
• Improved Healing: Relaxing the muscle allows better blood flow to reach the tear, which is necessary for the skin to knit back together.
• Prevention: Surgery is often the most effective way to keep the fissure from coming back again in the future.

Success means returning to your normal routine without the discomfort or worry that a chronic fissure can cause. Your clinician will help you determine if surgery is the right step to reach these goals.

Who may benefit

Surgery is often considered for people with a chronic anal fissure—a small tear in the lining of the anal canal that has not healed after six weeks or more. If home treatments like high-fiber diets, stool softeners, or medicated creams have not provided relief, your clinician may suggest a procedure to help the area heal.

The most common surgery is called a lateral internal sphincterotomy. This procedure involves making a small cut in the internal anal sphincter, which is the ring of muscle that stays closed to keep stool in. By relaxing this muscle, the surgery reduces pressure and spasms, allowing blood to flow better to the tear so it can finally heal.

When it may not be the right option

Surgery may not be the first choice if your fissure is "acute," meaning it is a new injury that might still heal with simple lifestyle changes. Your care team will usually try conservative treatments first to see if the body can repair itself without an operation.

In some cases, surgery might carry more risks than benefits. For example, if a patient already has issues with bowel control (incontinence), your clinician may be cautious about a procedure that involves the sphincter muscle. Additionally, if the fissure is caused by an underlying condition like Crohn’s disease (a type of inflammatory bowel disease), treating the main illness is often the priority rather than surgery on the fissure itself.

Questions to ask your care team

Deciding on surgery is a big step. It can be helpful to bring a list of questions to your next appointment to ensure you feel comfortable with the plan. You might consider asking:

• What are the specific risks and benefits of this procedure for me?
• How long is the typical recovery time before I can return to work?
• Are there any other medications or therapies we should try before surgery?
• How will this surgery affect my long-term bowel control?
• What is the likelihood that the fissure will return after the operation?

In the procedure room

When you arrive in the procedure room, the care team will help you get into a comfortable position. This is usually lying on your side with your knees tucked toward your chest or lying on your stomach with your hips slightly raised. The surgical team will then clean the area and use sterile drapes to ensure a safe environment.

High-level steps

The most common surgery for this condition is called a lateral internal sphincterotomy. During this procedure, the surgeon makes a small, precise cut in the internal anal sphincter, which is the ring of muscle that stays closed to control bowel movements. This step is done to reduce the tension and spasms in the muscle, which allows blood to flow better and helps the fissure heal.

Your clinician may also gently clean the edges of the tear (fissure) to help new, healthy skin grow. Depending on your specific needs, the small incision may be left open to heal naturally or closed with dissolvable stitches. Leaving the wound slightly open can sometimes help prevent fluid from building up as you heal.

Anesthesia and pain control

To ensure you do not feel pain during the surgery, your care team will use anesthesia. You may be fully asleep under general anesthesia, or you may receive a regional block that numbs the lower half of your body. In many cases, clinicians also use a local anesthetic—a numbing medicine injected directly into the area—to provide pain relief that lasts for several hours after the surgery is finished.

Monitoring and safety steps

Your safety is the top priority throughout the procedure. The medical team uses specialized equipment to constantly monitor your heart rate, blood pressure, and oxygen levels. These safety steps ensure that you remain stable and comfortable while the surgeon works. The team also follows a standard checklist to confirm all details before the procedure begins.

Immediately after the procedure

After the surgery is complete, you will be moved to a recovery room. Nurses will monitor you closely as the anesthesia wears off. You may notice a feeling of pressure, numbness, or mild soreness in the area, which is a normal part of the recovery process.

Your clinician may place a small piece of gauze, sometimes called packing, over the site to protect the wound and manage any minor spotting. Most patients are able to go home the same day once they are fully awake, can drink fluids, and are comfortable enough to move around.

Typical procedure length

The surgery itself is relatively short and typically takes about 20 to 30 minutes. While the procedure is quick, you should expect to spend a few hours at the medical facility to account for the time needed for preparation before the surgery and recovery afterward.

Common approaches (open vs minimally invasive)

The most common surgery for an anal fissure is called a lateral internal sphincterotomy. During this procedure, the surgeon makes a small cut in the internal anal sphincter muscle. This helps the muscle relax, reduces spasms, and improves blood flow so the fissure can heal.

Doctors typically use one of two techniques to reach the muscle:

• Open technique: The surgeon makes a small incision in the skin to clearly see the muscle before cutting it. This allows for precise visualization of the area.
• Closed technique: The surgeon inserts a blade beneath the skin through a tiny opening to cut the muscle. This approach is considered minimally invasive because it does not require a large open incision, though the surgeon relies on touch and feel to guide the instrument.

Partial vs total

It is important to note that surgeons do not cut the entire sphincter muscle, as this could permanently damage bowel control. Instead, the goal is to divide just enough muscle to relieve tension.

Your clinician may use a tailored (partial) approach. In this method, the surgeon cuts only the amount of muscle corresponding to the length of the fissure. This technique aims to preserve as much muscle function as possible while still treating the spasm.

In other cases, a more traditional approach may be used where the cut extends slightly further, typically up to a specific anatomical line inside the anal canal (the dentate line). The choice depends on your specific anatomy and the severity of the muscle spasm.

Revision or repeat procedures

Most surgeries for anal fissures are successful, but in rare cases, the fissure may not heal or could return. If symptoms persist, your doctor might check to see if the muscle is still tight. A repeat sphincterotomy may be considered if the initial cut was too small to fully relax the muscle.

However, if a repeat cut carries too much risk for bowel control, or if the muscle is already weak, the doctor may recommend a different procedure called an anal advancement flap. This involves taking a patch of healthy skin from a nearby area and using it to cover the fissure to encourage healing.

Tests and imaging that may be done

Before scheduling surgery, your clinician will examine you to confirm the diagnosis and rule out other conditions, such as Crohn’s disease. Because the area can be very painful, a full examination might sometimes be delayed until you are under anesthesia in the operating room.

To get a better view of the anal canal and lower colon, your doctor may recommend one of the following tests:

• Anoscopy: A short, rigid tube is used to inspect the anal canal.
• Flexible sigmoidoscopy: A thin, flexible tube with a small video camera allows the doctor to look at the lower part of your colon.
• Colonoscopy: This test inspects the entire colon. It is often recommended if you are over age 50 or have signs of other bowel conditions.

Medication adjustments

It is important to tell your healthcare team about all the medications, vitamins, and supplements you take. Some medicines, such as blood thinners, might increase the risk of bleeding during the procedure.

Your doctor will tell you which medications to take on the morning of surgery and which ones to pause. Only stop medicines if your clinician instructs you. According to medical guidelines for this procedure, antibiotics are not typically needed before the surgery begins.

Day-before and day-of instructions

Anal fissure surgery is usually an outpatient procedure, meaning you can go home the same day. Because anesthesia is often used to keep you comfortable, you will likely be told not to eat or drink for a specific time before your appointment.

Practical tips for the day of surgery include:

• Bowel preparation: Enemas are not routinely used for this surgery, but check your specific instructions to be sure.
• Transportation: Arrange for a friend or family member to drive you home, as you will be groggy from the anesthesia.
• Arrival: Bring your identification and insurance cards, and arrive at the surgery center or hospital at the time listed in your paperwork.

General surgical risks

Like any operation, surgery for an anal fissure carries some standard risks. These are not specific to the anal area but can happen with many types of medical procedures. Your surgical team takes many steps to prevent these issues before, during, and after the surgery.

• Reaction to anesthesia: Some patients may feel nauseous or groggy after waking up.
• Bleeding: Minor bleeding can occur at the surgical site.
• Infection: Bacteria can sometimes cause an infection in the area where the incision was made.

Most of these general risks are minor and can be managed quickly by your care team.

Procedure-specific complications

Because anal fissure surgery (specifically lateral internal sphincterotomy) involves making a small cut in the anal sphincter muscle, there are specific side effects to watch for. The most discussed risk involves changes in bowel control.

• Incontinence: Some patients may have difficulty controlling gas or, less commonly, stool. This is often a temporary issue that improves as the area heals. Permanent loss of control is rare.
• Recurrence: In a small number of cases, the fissure may not heal completely, or it may come back after surgery.
• Abscess or fistula: Rarely, an infection can lead to a pocket of pus (abscess) or a small tunnel developing between the anal gland and the skin (fistula).

How complications are treated

If complications do occur, they are often treatable. Your clinician will monitor your recovery closely to catch any issues early.

• Managing control issues: If you experience difficulty holding gas or stool, your doctor may recommend pelvic floor exercises, dietary changes, or medications to help strengthen the muscles and firm up bowel movements.
• Treating infections: Infections or abscesses are typically treated with antibiotics or a minor procedure to drain fluid.
• Addressing recurrence: If the fissure returns or does not heal, your doctor may suggest a different type of medication or, in rare cases, a second procedure.

Pain control medicines

Your clinician may use local anesthetics (numbing medicines) during the procedure to keep you comfortable. After surgery, they might suggest over-the-counter options like acetaminophen or ibuprofen to manage mild discomfort.

In some cases, topical medications like nitroglycerin or calcium channel blockers are used. These help relax the anal sphincter (the ring of muscle at the opening of the anus), which can reduce pain and help the area heal.

Stool softeners or fiber supplements are often recommended. These help keep bowel movements soft, making them easier and less painful to pass while you recover. Your clinician will tailor this plan based on your specific needs.

Safety note: Always tell your care team about any allergies or if you have a history of stomach issues when taking pain relievers, as some medicines can interact with other health conditions.

Antibiotics

Antibiotics are medicines used to treat or prevent infections caused by bacteria. While they are not always routine for every anal fissure surgery, your clinician may prescribe them if they see signs of infection or if you have certain health risks.

If you are prescribed antibiotics, it is important to take the full course exactly as directed. Be sure to mention any previous allergic reactions to medications, such as penicillin, to your surgical team before the procedure begins.

Blood thinners and clot prevention

If you take blood-thinning medications for other health conditions, your clinician will provide a specific plan. You may be asked to pause these medicines for a few days before surgery to manage the risk of bleeding during the procedure.

To help prevent blood clots after the procedure, your care team will likely encourage you to get out of bed and walk as soon as it is safe. Gentle movement helps keep your blood flowing properly during the early stages of recovery.

Your clinician will decide the best time for you to restart your regular medications. It is important to follow their instructions closely and not to stop or start blood thinners without specific guidance from your medical team.

Emergency warning signs

While complications are generally rare, heavy bleeding (hemorrhage) is a serious risk that requires immediate attention. You should seek emergency care if you experience significant bleeding from the rectum that does not stop with gentle pressure or soaks through your dressing quickly.

Call your surgeon or clinic if…

Reach out to your healthcare provider if you notice signs of an infection, such as a fever or a painful, swollen lump (abscess) near the surgical area. It is also important to contact your surgeon if you experience:

• Loss of control: Difficulty holding in gas or bowel movements (incontinence).
• New drainage: Unexpected discharge or fluid, which could be a sign of a fistula.
• Unmanaged pain: Pain that gets worse or is not relieved by your pain medicine.

Expected vs concerning symptoms

Most people have: Some mild bruising (ecchymosis) around the area and temporary discomfort during bowel movements while healing.

Call if you have: Persistent inability to control gas or stool, signs of a deep infection like an abscess, or bleeding that is heavy rather than just minor spotting.

Non-surgical treatments

Most people can manage an anal fissure—a small tear in the lining of the anal canal—without surgery. Your clinician may first suggest lifestyle changes to help stool pass more easily. This often includes eating more fiber-rich foods like fruits and vegetables, drinking plenty of water, and using stool softeners. These steps help prevent straining, which allows the tear to heal naturally.

Other common non-surgical options include:

• Sitz baths: Soaking the area in plain, warm water for 10 to 15 minutes several times a day. This helps relax the muscle and increase blood flow to the area.
• Medicated creams: Prescription ointments, such as nitroglycerin or calcium channel blockers, can help relax the internal muscle (sphincter) and reduce pain.
• Botox injections: A clinician may inject botulinum toxin into the muscle to temporarily relax it, which helps the area stay calm so it can heal.

Watchful waiting

Watchful waiting is a period where you and your clinician monitor the fissure to see if it heals on its own. Many fissures are "acute," meaning they are new and often resolve within a few weeks with simple home care. During this time, you may focus on keeping your stools soft and avoiding constipation to prevent further irritation.

If the pain and bleeding begin to improve, surgery is usually not necessary. However, if the symptoms stay the same or get worse after several weeks of home care, your clinician may recommend moving to more active medical treatments or a surgical consultation.

When surgery becomes the best option

Surgery is typically considered when a fissure becomes "chronic," which means it has not healed after six to eight weeks of medical treatment. If creams, lifestyle changes, or injections do not provide enough relief, or if the pain is so severe that it interferes with your daily activities, your clinician may suggest a procedure.

The goal of surgery is to reduce the tension in the internal muscle. This helps lower the pressure in the area, which improves blood flow and allows the tear to finally close. While surgery is often very effective for long-term healing, it is usually reserved for cases where other conservative methods have not been successful.

Hospital services that commonly perform this surgery

Anal fissure surgery is usually performed in specialized departments within a hospital or at a dedicated outpatient surgery center. Most procedures are handled by the Colorectal Surgery or General Surgery departments. These teams specialize in treating conditions of the lower digestive tract.

Your clinician may refer you to a colon and rectal surgeon. These are doctors who have completed advanced training in treating the colon, rectum, and anus. Because this surgery is often a brief, same-day procedure, it is frequently performed in an ambulatory (outpatient) surgical unit where you can return home shortly after the operation.

Patient resources and support services

Many hospitals provide resources to help you prepare for surgery and recover smoothly. You may have access to dietary counseling. A registered dietitian can help you plan a high-fiber diet, which is essential for keeping stools soft and preventing future issues. They may also provide guidance on proper fluid intake.

Support services often include:

• Pain Management Teams: Specialists who help manage discomfort during the healing process.
• Patient Portals: Online tools to message your surgical team with questions about your recovery.
• Pre-operative Education: Classes or brochures that explain what to expect before, during, and after the procedure.
• Nursing Support: Dedicated staff who provide instructions on wound care and sitz baths (soaking in warm water).

Questions for choosing where to have surgery

Choosing the right facility can help you feel more confident about your care. You may want to ask your clinician or the surgical center the following questions:

• How many of these specific procedures does the surgeon perform each year?
• Is the facility accredited for outpatient surgery?
• What kind of support is available if I have questions or concerns after I go home?
• Does the center provide clear instructions on diet and activity levels for the weeks following surgery?
• What are the typical wait times for follow-up appointments?

It is helpful to choose a location that feels accessible to you, as you will likely need to return for at least one follow-up visit to ensure the area is healing properly.

Conditions commonly treated by this procedure

The primary condition treated by this surgery is a chronic anal fissure. This is a small tear in the thin, moist tissue that lines the anal canal. While many of these tears heal on their own with increased fiber or special creams, some may persist for six weeks or longer despite these efforts.

A clinician may recommend surgery if the fissure is linked to high tension in the internal anal sphincter muscle. This increased pressure can limit blood flow to the area, which may prevent the tear from healing naturally. The procedure is designed to help relax this muscle and improve circulation to the site.

Related symptoms people search for

Individuals considering this procedure often report a specific set of symptoms. These signs can vary from person to person, but they often include:

• Pain during bowel movements: This is often described as a sharp or stinging sensation that may last for several minutes or even hours after using the bathroom.
• Bright red blood: You may notice small amounts of blood on the surface of the stool or on the toilet tissue after wiping.
• Visible changes: A small, narrow crack in the skin around the anus may be visible, sometimes accompanied by a small lump or skin tag near the tear.

Because these symptoms can sometimes overlap with other health concerns, your clinician may perform an exam to confirm the cause of your discomfort and determine if surgery is the right step for you.

Evidence overview

Surgery is generally reserved for anal fissures that have not healed with home remedies or medications. The most common procedure is called lateral internal sphincterotomy (LIS). Medical evidence often considers this surgery the "gold standard" for treating chronic fissures because it has a high success rate.

Research shows that this surgery is more effective at healing fissures than using medicine alone. The goal of the procedure is to stop the cycle of pain and spasm. By cutting a small part of the anal sphincter muscle, the surgery helps the muscle relax. This improves blood flow to the area and allows the fissure to heal.

Safety notes and individualized care

While anal fissure surgery is effective, your clinician will weigh the benefits against the risks. The most significant safety consideration is the risk of incontinence, which means having trouble controlling gas or bowel movements.

For most patients, changes in bowel control are mild. Common issues may include:

• Inability to control gas (flatus).
• Minor leakage or soiling of underwear.
• Temporary difficulty holding a bowel movement.

These symptoms often go away on their own as you heal, but in some cases, they can be long-term. Because of this risk, doctors are very careful when recommending surgery for patients who already have weak muscles or existing bowel control problems. Other general surgical risks may include bleeding, infection, or temporary trouble urinating after the procedure.

Sources used

The content in this section is grounded in established medical guidelines and surgical literature. It references information from reputable types of sources, including:

• Major academic medical centers and research institutions.
• Peer-reviewed medical reference articles and surgical guides.