Fistulotomy

What this procedure is

A fistulotomy is a common surgical procedure used to treat an anal fistula. An anal fistula is a small, abnormal tunnel that forms between the end of the bowel and the skin near the anus. This tunnel is often the result of a previous infection.

During the procedure, a surgeon makes a small incision to open the length of the tunnel. This turns the tunnel into an open groove, which allows the area to heal properly from the inside out. Your clinician may recommend this approach because it is often a very effective way to clear the infection and help the tissue repair itself.

What it treats or fixes

This procedure is designed to fix an anal fistula. These tunnels often develop after an anal abscess (a collection of pus) has been drained but does not heal completely. If the tunnel remains open, it can cause ongoing discomfort and health issues.

By opening the tunnel, the surgery helps resolve several symptoms, including:

• Persistent pain or swelling in the area.
• Unusual drainage or skin irritation.
• Recurrent infections or abscesses.

The main goal of the procedure is to allow the fistula to heal while protecting the nearby muscles that help control bowel movements. Your surgical team will determine if a fistulotomy is the best option based on the location and path of the tunnel.

How common it is & where it's done

Fistulotomy is one of the most frequently performed surgeries for this condition. It is widely used because it has a high success rate for many patients with simple fistulas. It is considered a standard treatment in both the United States and Canada.

The procedure is typically performed in a hospital or an outpatient surgery center. In most cases, it is an "outpatient" surgery, meaning you can usually go home the same day once you have recovered from the anesthesia. The surgery is performed by specialists, such as colorectal surgeons or general surgeons, who have specific training in treating these conditions.

Recovery: What to Expect

Most people are able to go home the same day as their fistulotomy. In the days following the procedure, your clinician may recommend taking sitz baths, which involve soaking the area in a few inches of warm water several times a day. This helps keep the area clean and can soothe discomfort during the healing process.

To make bowel movements more comfortable, you may be advised to eat a high-fiber diet and drink plenty of fluids. Your clinician might also suggest a stool softener. While you may need to take it easy for a few days, most patients can return to their regular activities fairly quickly as the area heals from the inside out.

Risks & Possible Complications

While a fistulotomy is generally safe, all surgeries carry some risks. Common but minor issues include slight bleeding or a small amount of discharge from the site for a few weeks. Your care team will monitor you for signs of infection, such as a fever or increasing redness.

A more specific risk involves the sphincter muscles, which are the muscles that control bowel movements. If the fistula (the abnormal tunnel) passes through these muscles, there is a small risk that surgery could affect bowel control. Your surgeon will discuss your specific anatomy with you to minimize this possibility. You should call your clinician if you experience severe pain that does not improve with medicine or if you have a high fever.

Outcomes & Long-Term Results

A fistulotomy is considered a very effective treatment with a high success rate. The goal is to open the tunnel so it can heal into a flat scar. For most simple fistulas, this procedure provides a permanent solution and prevents the tunnel from returning.

Complete healing usually takes several weeks. Following your clinician’s aftercare instructions is the best way to ensure a good long-term result. While it is possible for a fistula to come back, this is less common when the area is allowed to heal properly and any underlying conditions are managed.

Emotional Support & Reassurance

It is completely normal to feel sensitive or anxious about having surgery in this area of the body. Please know that anal fistulas are a common medical condition, and your surgical team is highly experienced in treating them with care and discretion.

Focusing on the long-term relief can help ease your mind. By treating the fistula now, you are taking an important step toward better physical comfort and preventing future infections. If you have concerns, your healthcare team is there to support you and answer any questions you have about your path to recovery.

Why doctors recommend it

An anal fistula is a small tunnel that forms between the inside of the anus and the skin nearby. This tunnel often develops after an infection or a collection of fluid, called an abscess, has drained. Because these tunnels rarely heal on their own, clinicians often recommend a fistulotomy to help the area close properly.

A fistulotomy is considered a highly effective treatment for many simple fistulas. During this procedure, the surgeon cuts along the length of the tunnel to open it up. This allows the area to heal from the inside out, eventually turning the tunnel into a flat scar. Your clinician may suggest this option if the fistula is straightforward and does not involve a large amount of the sphincter muscles, which are the muscles used for bowel control.

Urgent vs planned treatment

In most cases, a fistulotomy is a planned procedure. This means you and your care team can schedule it at a time that works best for you. It is often the second step in a treatment plan that began with draining a painful abscess. Once the initial swelling and infection have gone down, the surgeon can better see the path of the fistula to treat it safely.

While the surgery itself is rarely an emergency, it is usually recommended to prevent new problems. If left untreated, a fistula can lead to repeated infections or more complex tunnels that are harder to treat. If you develop a new fever or increased swelling, your clinician might recommend moving the procedure up to address a possible recurring infection.

Goals of treatment

The primary goal of a fistulotomy is to clear the fistula for good while keeping the surrounding muscles healthy. Success in this procedure generally means:

• Healing the tunnel: By opening the path, the body can fill the space with new tissue, effectively closing the tunnel.
• Preventing recurrence: The procedure aims to stop the fistula from coming back in the same spot.
• Protecting muscle function: Surgeons work carefully to protect the muscles that help you control your bowel movements.
• Relieving symptoms: The surgery is designed to stop the persistent drainage, skin irritation, and discomfort caused by the fistula.

Who may benefit

A fistulotomy is often recommended for people with a simple anal fistula. A fistula is a small, abnormal tunnel that forms between the end of the bowel and the skin near the anus. This tunnel often develops after an infection or an abscess (a painful pocket of pus) has drained but failed to heal completely.

Your clinician may suggest this procedure if you have ongoing symptoms like pain, swelling, or fluid leaking from the area. The goal of the surgery is to open the tunnel, allowing it to heal from the inside out into a flat scar. This is generally considered a very effective way to resolve the issue for many patients.

When it may not be the right option

While a fistulotomy is common, it may not be the best choice for every situation. If the fistula tunnel passes through a large portion of the sphincter muscles—the muscles that help you control your bowel movements—your surgeon may avoid a standard fistulotomy. Cutting too much of this muscle could lead to bowel control problems, also known as incontinence.

Additionally, if you have certain underlying health conditions, such as Crohn’s disease, your care team might recommend different treatments first. In these cases, the focus is often on managing inflammation or using less invasive methods to help the area heal without risking damage to the surrounding tissue.

Questions to ask your care team

Deciding on surgery is a collaborative process. You may want to bring a list of questions to your next appointment to help you feel more comfortable with the plan. Consider asking:

• How much of the sphincter muscle is involved in my fistula?
• What are the risks to my bowel control with this specific procedure?
• Are there other options, such as a seton (a medical thread) or a medical plug, that might be safer for me?
• What does the typical recovery timeline look like for someone in my situation?
• How can I best care for the area at home to make sure it heals properly?

In the procedure room

When you arrive for your surgery, the medical team will help you get into a comfortable position. This is often lying on your side with your knees tucked toward your chest or lying on your stomach. The area will be cleaned and prepared to keep the site sterile and safe.

High-level steps

The surgeon begins by finding the fistula, which is an abnormal tunnel that has formed between the inside of the anus and the skin. They will carefully open the length of this tunnel to turn it into a shallow groove. This allows the area to heal from the inside out, which helps prevent the tunnel from closing over and forming a new pocket of infection.

In some cases, your clinician may place a "seton." This is a thin, soft piece of surgical thread left in the tunnel to help it drain or to help the area heal more slowly and safely over time.

Anesthesia and pain control

To ensure you are comfortable and do not feel pain, your care team will use anesthesia. Your clinician may use general anesthesia, which puts you into a deep sleep, or regional anesthesia, which numbs the lower half of your body. In some instances, a local anesthetic is used to numb only the specific area being treated.

Monitoring and safety steps

During the entire procedure, the surgical team monitors your vital signs, including your heart rate, blood pressure, and oxygen levels. The surgeon also carefully checks the fistula's path in relation to the sphincter muscles, which are the muscles that control bowel movements. This careful mapping helps the surgeon perform the repair while protecting your muscle function.

Immediately after the procedure

After the surgery is finished, you will be moved to a recovery room where the anesthesia will gradually wear off. You may feel some numbness or a mild, dull soreness in the area. Your clinician may place a small piece of gauze or "packing" over the site. This is done to protect the open groove and absorb any fluid as the healing process begins.

Most patients are able to go home the same day once they are fully awake and the medical team has confirmed you are recovering well.

Typical procedure length

A fistulotomy is generally a quick procedure. It typically takes between 30 and 60 minutes. The exact time can vary depending on the length and location of the fistula tunnel.

Common approaches (open vs minimally invasive)

The most standard form of this surgery is an open fistulotomy. In this procedure, the surgeon cuts along the length of the fistula tunnel. This opens the tunnel so it becomes a flat groove or trench. This allows the tissue to heal from the inside out, rather than closing over the top and trapping infection inside.

While the open approach is very common for simple fistulas, it may not be the right choice if the fistula passes through a significant amount of the anal sphincter muscle. Cutting this muscle can affect bowel control. In these cases, your doctor may suggest minimally invasive options or alternative techniques that spare the muscle, such as:

• LIFT procedure: A technique that ties off and cuts the fistula tract between the sphincter muscles.
• Fistula plugs or glues: Using medical-grade materials to fill and seal the tunnel.
• Laser treatments: Using laser energy to close the tract.

These minimally invasive options are generally reserved for more complex cases and are not always applicable for every patient.

Partial vs total

The decision to repair the entire fistula at once or to do it in parts depends largely on how much muscle is involved.

• Total (One-Stage) Repair: If the fistula is shallow and does not involve much of the sphincter muscle, the surgeon can usually perform a total fistulotomy. This fixes the entire problem in a single surgery.
• Partial or Staged Repair: If a large portion of muscle is involved, a surgeon may choose a staged approach to protect your ability to control bowel movements. This involves treating the fistula a little bit at a time.

For staged repairs, a clinician often places a seton. A seton is a piece of surgical thread or rubber loop placed through the fistula. It keeps the tunnel open to let infection drain and helps the tissue heal slowly over weeks or months. Once the area is safer to operate on, a second procedure is performed to finish the repair.

Revision or repeat procedures

Fistulotomy is generally effective, but anal fistulas can sometimes be difficult to cure completely on the first try. A revision or repeat procedure might be necessary if:

• The fistula returns (recurrence) after healing.
• The wound heals on the surface but leaves a pocket of infection underneath.
• A staged approach was planned from the beginning, requiring a second scheduled surgery.

Your care team will monitor your recovery closely. If symptoms persist or return, they may recommend further evaluation to decide if a revision is the best next step.

Tests and imaging that may be done

Before scheduling the procedure, your healthcare provider needs to see exactly where the fistula is located. This helps them plan the safest way to treat the tunnel while protecting your sphincter muscles.

• Physical exam: The doctor will look at the skin around the anus and may perform a digital rectal exam to feel for the fistula tract.
• Scopes: You might need a short procedure called an anoscopy or sigmoidoscopy. This uses a small, lighted tube to look inside the rectum to find the inner opening of the fistula.
• Imaging scans: If the fistula looks complex or deep, your doctor may order an MRI or an endoscopic ultrasound. These tests create detailed pictures of the tunnel and the surrounding muscles.

Medication adjustments

It is important to give your care team a full list of everything you take. This includes prescription medicines, over-the-counter drugs, vitamins, and herbal supplements.

Your clinician may ask you to pause certain medications that can increase the risk of bleeding. Common examples include:

• Aspirin or ibuprofen (NSAIDs)
• Prescription blood thinners (anticoagulants)
• Certain supplements, such as Vitamin E or fish oil

Note: Only stop taking these medicines if your clinician specifically instructs you to do so. They will tell you when it is safe to start taking them again after the procedure.

Day-before and day-of instructions

Most fistulotomies are outpatient procedures, meaning you go home the same day. To get ready, your care team will give you specific instructions to follow.

The day before:

• Bowel preparation: You may be asked to use an enema to clear your rectum. This is often done the evening before or the morning of the surgery.
• Fasting: If you are having general anesthesia (being put to sleep) or sedation, you will likely be told not to eat or drink anything after midnight the night before.

The day of surgery:

• Hygiene: Take a shower or bath before coming to the hospital or surgery center to lower the risk of infection.
• Clothing: Wear loose, comfortable clothes that are easy to change out of.
• Transportation: Because of the anesthesia, you will not be allowed to drive yourself home. You must arrange for a friend or family member to pick you up.

General surgical risks

Like any operation, a fistulotomy carries standard risks associated with surgery. Your surgical team takes many precautions to keep these risks low. Common general risks include:

• Infection: Because the surgery is performed in the anal area, the wound can sometimes become infected.
• Bleeding: Some bleeding is expected during recovery, but heavy bleeding is less common.
• Reactions to anesthesia: Some patients may feel nauseous or have a reaction to the medication used to numb the area or put them to sleep.

Procedure-specific complications

There are specific side effects related to anal fistula repair. The most significant concern involves the sphincter muscles, which are the muscles that control bowel movements. If a large portion of the muscle is cut, it can affect how well you hold in stool.

• Changes in bowel control: This is often called incontinence. It can range from mild difficulty holding in gas to accidental leakage of liquid or solid stool. For many patients, this is minor or improves over time.
• Recurrence: Sometimes, the fistula can come back after surgery. This may happen if the wound does not heal from the inside out properly or if the fistula was complex.
• Trouble urinating: Immediately after surgery, some patients may have temporary difficulty passing urine (urinary retention).
• Delayed healing: In some cases, the surgical wound may take longer than expected to close completely.

How complications are treated

Most complications are manageable and treatable. Your clinician will monitor your recovery to catch any issues early. Treatments depend on the specific problem:

• For infections: Your clinician may prescribe antibiotics or perform a minor procedure to drain fluid from the area.
• For urinary retention: If you cannot urinate right after surgery, a temporary catheter (a thin tube) may be used to empty your bladder until normal function returns.
• For bowel control issues: If you experience leakage, pelvic floor physical therapy can help strengthen the muscles. In rare cases where the issue persists, additional repair surgery might be considered.
• For recurrence: If the fistula returns, your clinician may recommend a second procedure or a different surgical technique to help it heal permanently.

Pain control medicines

After a fistulotomy (a surgery to open and heal a fistula tract), managing discomfort is a priority. Your clinician may suggest over-the-counter options like acetaminophen or ibuprofen to reduce swelling and pain. These are often the first step in staying comfortable during recovery.

In some cases, your clinician may provide a short course of stronger prescription medicine. They might also recommend stool softeners or fiber supplements. These help make bowel movements easier and less painful while the surgical site heals.

Antibiotics

Antibiotics are medicines used to treat or prevent infections caused by bacteria. Your clinician may prescribe these if you have an active infection or an abscess—which is a painful, swollen pocket of infection—near the fistula.

Not every patient will need antibiotics after the procedure. Your care team will tailor this decision based on your specific health history and the complexity of the fistula. It is important to finish the full course of any prescribed antibiotics even if you start feeling better.

Blood thinners and clot prevention

If you take blood thinners, which are medicines that help prevent blood clots, your clinician will give you specific instructions. They may ask you to stop taking them for a short time before the surgery to reduce the risk of bleeding.

Common examples include aspirin or other prescription anticoagulants. Your clinician will also check for any potential drug interactions or allergies. Always tell your care team about every medication and supplement you take to ensure your treatment plan is safe for you.

Emergency warning signs

While serious complications are rare, it is important to know when to seek immediate help. Go to the emergency room or call emergency services if you experience:

• Heavy bleeding: Bleeding that soaks through your dressing very quickly or does not stop with pressure.
• Inability to urinate: If you feel the need to urinate but cannot pass any urine (urinary retention), this requires immediate medical attention.
• Signs of severe infection: This may include a high fever with shaking chills, confusion, or extreme weakness.

Call your surgeon or clinic if…

Contact your healthcare provider if you notice changes that do not seem right but are not immediate emergencies. Your clinician may want to check your healing progress if you have:

• Fever: A temperature over 100.4°F (38°C).
• Worsening pain: Pain that increases significantly or is not relieved by your prescribed pain medication.
• Signs of wound infection: Look for spreading redness, increased swelling, or skin that feels hot to the touch around the surgical site.
• Bowel control issues: Difficulty controlling gas or stool (incontinence) that does not improve.
• Severe constipation: If you have not had a bowel movement for several days despite using stool softeners or following your doctor’s advice.

Expected vs concerning symptoms

Recovering from a fistulotomy takes time. Knowing the difference between normal healing and potential problems can help you stay calm.

Bleeding

• Expected: It is normal to see small amounts of blood or spotting on your gauze or in the toilet bowl, especially after a bowel movement.
• Concerning: Passing large clots or bleeding that flows heavily like a faucet is not normal.

Drainage

• Expected: You may see clear, yellowish, or slightly pink fluid draining from the wound as it heals. This can last for several weeks.
• Concerning: Thick, cloudy pus or drainage that has a foul, bad smell may indicate an infection.

Pain

• Expected: Soreness and discomfort in the anal area are common, especially during the first week or during bowel movements.
• Concerning: Sharp, shooting pain that gets worse over time instead of better is a reason to call your doctor.

Non-surgical treatments

For most people, an anal fistula—a small tunnel that connects an infected gland inside the anus to an opening on the skin—does not heal by itself. However, your clinician may suggest certain non-surgical steps to manage symptoms or treat an underlying cause. For example, if you have Crohn’s disease, specific medications like biologics may help the fistula close or reduce inflammation.

Other non-surgical or minimally invasive options include:

• Antibiotics: These are used to clear up an infection or a collection of pus (abscess), though they usually cannot close the fistula tunnel itself.
• Fibrin glue: A special medical glue is injected into the tunnel to seal it. This is less invasive than surgery, but it may have a lower success rate.
• Collagen plugs: A plug made of natural proteins is used to block the tunnel, allowing your body to heal around it over time.

Watchful waiting

Watchful waiting means monitoring your symptoms closely without starting a procedure right away. This approach is rarely the primary recommendation because fistulas almost never go away without treatment. If left alone, the tunnel may continue to drain or could lead to repeated infections.

Your clinician might suggest watchful waiting only if your symptoms are very mild or if you have other health conditions that make surgery more risky at the moment. During this time, the focus is on keeping the area clean and watching for signs of a new infection, such as increased pain, swelling, or fever.

When surgery becomes the best option

Surgery, such as a fistulotomy, is often considered the most effective way to permanently close the tunnel and prevent it from coming back. Your clinician may recommend moving forward with surgery if you experience:

• Recurrent abscesses: If you keep getting painful, infected lumps in the area, surgery can stop the cycle.
• Persistent drainage: Constant fluid or stool leaking from the opening can be uncomfortable and difficult to manage.
• Increased complexity: Over time, an untreated fistula can develop extra branches, making it harder to treat later.

The goal of surgery is to balance healing the fistula while protecting the sphincter muscles (the muscles that control bowel movements). If the fistula is simple and does not involve much muscle, a fistulotomy is often the preferred choice for a complete recovery.

Hospital services that commonly perform this surgery

A fistulotomy is usually performed in specialized hospital departments that focus on the digestive system. Most patients will receive care through a Colorectal Surgery or General Surgery department. These teams are led by surgeons who have special training in treating the colon, rectum, and anal area.

Many of these procedures are done in Outpatient Surgery Centers or Ambulatory Care Units. This means the surgery is often a "same-day" procedure where you do not need to stay in the hospital overnight. Some hospitals also coordinate care through their Gastroenterology (GI) units to ensure your overall digestive health is managed before and after the operation.

Patient resources and support services

Recovery often involves specific care for the surgical site. Many hospitals provide access to a Wound Care Clinic, where specialists can show you or a caregiver how to clean the area and use dressings properly. These clinics are helpful for ensuring the site heals correctly and for answering questions about physical comfort.

Your healthcare team may also offer the following support services:

• Nurse Navigators: These professionals help you coordinate your appointments and explain your recovery plan.
• Patient Education Materials: Hospitals often provide printed guides or videos that explain how to manage diet and activity levels after surgery.
• Support Groups: Some facilities host groups for people with digestive health conditions, providing a space to share experiences and tips for recovery.

Questions for choosing where to have surgery

Choosing a facility where you feel comfortable is an important part of your care. Your clinician may suggest a specific center, but you can also research options based on your needs. Consider using this checklist when talking to a hospital or surgical center:

• Is the surgeon board-certified in colorectal or general surgery?
• How many fistulotomy procedures does this facility perform annually?
• Is the surgery performed as an outpatient procedure, or is an overnight stay common?
• What specific wound care resources are available to patients after they go home?
• Who should I contact if I have questions about my healing during the evening or on weekends?

Conditions commonly treated by this procedure

A fistulotomy is most often used to treat an anal fistula. This is a small, abnormal tunnel that forms between the inside of the anus and the skin nearby. These tunnels often develop after an anal abscess (a painful pocket of infection) has drained but failed to heal completely.

While many fistulas are caused by simple infections, they can also be associated with other health concerns. Your clinician may evaluate you for conditions like Crohn’s disease or other inflammatory bowel issues, as these can sometimes lead to the formation of fistulas. A fistulotomy is typically recommended for simple tunnels that do not involve a large amount of the muscle used for bowel control.

Related symptoms people search for

Symptoms associated with a fistula can vary, but they often cause ongoing discomfort. People may search for information regarding:

• Pain and swelling: Constant or throbbing pain around the anal area that may feel worse when sitting down or during a bowel movement.
• Drainage: Noticing fluid, pus, or small amounts of blood on undergarments or when wiping.
• Skin irritation: Redness, itching, or soreness around the skin opening where the tunnel reaches the surface.
• Recurrent infections: A history of sores or abscesses that seem to heal and then return in the same location.

In some cases, an active infection may also cause a fever or a general feeling of being tired. Because these signs can be similar to other conditions, your clinician may use a physical exam or imaging tests to confirm the cause of your symptoms and determine if a fistulotomy is the right treatment for you.

Evidence overview

Fistulotomy is widely considered the standard treatment for simple anal fistulas. A fistula is a small tunnel that connects an infected gland inside the anus to the skin outside. Medical research generally shows that this procedure has a high success rate for curing the condition and preventing it from returning.

The procedure involves opening the tunnel so it can heal from the inside out. Because this surgery has been performed for many years, there is a large amount of medical evidence supporting its effectiveness. For simple cases that do not involve deep muscle layers, it is often the first option recommended by surgeons.

Safety notes and individualized care

Like any surgical procedure, a fistulotomy carries some risks, such as bleeding, infection, or temporary difficulty urinating. However, the main safety consideration involves the anal sphincter, which is the ring of muscle that controls bowel movements.

If a fistula passes through a significant amount of this muscle, cutting it could lead to changes in bowel control (incontinence). To reduce this risk, your clinician will carefully examine the path of the fistula. If the risk to the muscle is too high, they may suggest a different treatment or a staged approach (doing the repair in steps) to protect your long-term function.

Your medical history also plays a role in safety. For example, patients with conditions that cause inflammation, such as Crohn’s disease, may need specialized care plans. Your surgeon will tailor the treatment to your specific anatomy and health needs to balance healing with safety.

Sources used

The content in this section is grounded in educational materials and clinical overviews from major academic medical centers, government health libraries, and surgical health organizations.