Anal Fistula Surgery & Treatment in Singapore
An anal fistula is an abnormal tunnel between the inside of the anal canal and the skin near the anus, typically developing after an incompletely healed perianal abscess.
Surgical treatment is typically required. The choice between fistulotomy, seton, LIFT, or advancement flap depends on the fistula’s depth and position relative to the sphincter muscles. Bowel control preservation is also a central consideration in every treatment plan.
Dr. Sulaiman Bin Yusof is a Senior Consultant colorectal surgeon who provides anal fistula surgery in Singapore across five clinic locations: Gleneagles, Mount Elizabeth Novena, Parkway East, Mount Alvernia, and Farrer Park Medical Centre.
Dr. Sulaiman Bin Yusof
蘇萊曼·尤索夫博士
What Is an Anal Fistula? The Abscess Connection Explained
An anal fistula is a small tunnel that develops between the end of the bowel (the rectum) and the skin near the anus.
How an Anal Fistula Forms After a Perianal Abscess
The anus contains small glands that produce fluid to aid bowel movements. When one of these glands becomes blocked or infected, an abscess (a pus-filled pocket) forms.
If the abscess is drained but the infected gland at its source does not close, a small tunnel forms between the gland and the skin.
This tunnel is the fistula, and it will not close as long as the internal opening remains active.
How an Anal Fistula Looks and Feels Like
Externally, a fistula typically appears as a small opening near the anus, sometimes with surrounding redness or swelling.
Most people notice a persistent or intermittent discharge of pus or blood from this opening, along with pain and irritation in the anal area.
Will an Anal Fistula Heal on Its Own?
An anal fistula almost never resolves without treatment as the internal opening acts as a constant source of bacterial reinfection.
Therefore, delaying treatment increases the risk of a more complex fistula or recurring abscesses.
How to Tell the Difference Between a Fistula and Haemorrhoids
Unlike haemorrhoids, which cause bleeding during bowel movements without a persistent external opening, a fistula produces continuous or intermittent discharge from a small hole near the anus. That external opening is the distinguishing sign.
Symptoms of an Anal Fistula: When to See a Specialist
An anal fistula can cause several symptoms, all stemming from the ongoing infection and inflammation the fistula tract produces.
Persistent Discharge Near the Anus
A recurring discharge of pus, blood, or clear fluid from a small opening near the anus is the most characteristic symptom of an anal fistula.
If you notice this, especially following a previous abscess, see a colorectal surgeon promptly.<
Pain, Swelling, and Tenderness
When a fistula creates a pathway from an infected internal gland to the skin surface, the surrounding tissue becomes inflamed. This presents as persistent or throbbing pain in the anal area, often accompanied by a tender lump near the anus.
Skin Irritation
Continuous leakage of pus or fluid from the fistula opening irritates the surrounding skin, causing itching, redness, and general discomfort in the perianal area.
Foul Odour
Drainage from a fistula tract often carries an unpleasant odour, a direct result of infected material passing through the tunnel.
Recurring Abscesses
If you have had more than one abscess in the same location, an underlying fistula tract is almost certainly present.
Each new abscess is the fistula re-infecting. Recurring infections in the same site should be assessed by a colorectal surgeon, as the abscess will continue to return until the fistula is treated.
Causes & Risk Factors
Several factors can lead to the formation of an anal fistula, most beginning with an infection in the anal glands.
Anal Gland Infection
When an anal gland becomes blocked and infected, an abscess can form. If that abscess is not fully drained, or if the infected gland at its source does not close after drainage, a fistula tract develops between the gland and the skin.
This is one of the most common causes of anal fistulas. 90% of all anal abscesses result from anal gland infection, and approximately 25% to 30% of patients with an anal abscess will eventually develop an anal fistula.
Crohn’s Disease
Crohn’s disease is a chronic inflammatory bowel condition that weakens intestinal tissue, causing sores that can develop into fistulas over time.
Crohn’s-related fistulas are often more complex, involving multiple tracts, and require specialist management that accounts for both the fistula and the underlying IBD.
Dr. Sulaiman takes an integrated approach to both, treating the fistula in the context of the disease.
Ulcerative Colitis
Ulcerative colitis affects the lining of the colon and rectum. Chronic inflammation in these areas can cause ulcers that may develop into fistulas if they become infected.
Cancer
Tumours in the rectum or anus can compress surrounding tissues, leading to infection and abscess formation. These abscesses may develop into fistulas if they do not resolve.
Who Is at Highest Risk?
Anal fistulas are more likely to develop in:
- Men aged 20 to 60
- Patients with a history of perianal abscess
- Patients with Crohn’s disease
- Patients who are immunocompromised, such as those with diabetes or HIV
Types of Anorectal Fistula: Simple vs Complex
Anal fistulas are classified by their relationship to the anal sphincter muscles. The higher the fistula tract passes through the sphincter complex, the more complex the surgery required to treat it safely.
Intersphincteric Fistula
This is the most common type, accounting for approximately 45% of anal fistulas. In these cases, the tract runs between the internal and external sphincter muscles without passing through the external sphincter.
This classification is generally treatable with fistulotomy, carrying a low risk to continence.
Transsphincteric Fistula
Transsphincteric fistula tracts pass through both the internal and external sphincter muscles, making them more complex.
Fistulotomy alone carries a risk of incontinence at this level, so sphincter-preserving techniques, such as the LIFT procedure or seton placement, are typically preferred.
Suprasphincteric and Extrasphincteric Fistulas
These complex fistulas are the rarest. Suprasphincteric fistulas pass above the sphincter complex, while extrasphincteric tracts extend outside it entirely.
Both require staged surgical approaches, MRI-guided planning, and specialist colorectal expertise to manage safely.
Superficial Fistula
Superficial fistulas sit below the sphincter muscles entirely. They carry the lowest surgical risk and are generally straightforward to treat.
| Low Fistula | High Fistula | |
|---|---|---|
| Fistula Type |
|
|
| Sphincter Involvement | Minimal or none | Partial to full |
| Preferred Surgery | Fistulotomy | Seton, LIFT, advancement flap, or staged procedures |
| Risk to Continence | Low | Moderate to high without specialist technique |
Diagnosing an Anal Fistula in Singapore
Diagnosing an anal fistula involves confirming the tract’s location, depth, and relationship to the sphincter muscles before any treatment decision is made.
Medical History and Physical Examination
The process begins with a detailed medical history, focusing on symptoms and previous perianal infections or abscesses. A physical examination, including a digital rectal examination (DRE), is then conducted to identify abnormal openings, tenderness, or palpable tracts near the anus.
MRI Fistulogram
Magnetic Resonance Imaging (MRI) is the gold standard for mapping complex anal fistulas, particularly high and recurrent cases. It shows the full extent of the tract, its relationship to the sphincter muscles, and any secondary extensions, which are all critical information before surgical planning begins.
Endoanal Ultrasound
Endoanal ultrasound provides detailed real-time images of the fistula tract and the surrounding sphincter tissues. It is particularly useful for mapping lower, simpler fistulas in a clinic setting.
Examination Under Anaesthesia (EUA)
For fistulas that are difficult to assess fully in the clinic, an EUA offers a thorough mapping of the tract before deciding on the surgical approach.
Anal Fistula Treatment in Singapore: Fistulotomy, LIFT, Seton & More
Fistulotomy
Fistulotomy is the most common anal fistula operation for simple, low fistulas not involving significant sphincter muscle.
The surgeon cuts open the entire length of the fistula tract, allowing it to heal from the inside out as a flat scar. Most patients go home the same day, with recovery taking approximately 2 to 3 weeks.
Seton Placement
For complex or high fistulas where dividing the sphincter would risk incontinence, a surgical thread (seton) is passed through the tract.
A loose seton drains the tract and allows it to mature before a planned second procedure, while a cutting seton applies gradual tension to slowly divide the muscle over time.
The approach is determined by the fistula’s anatomy and sphincter involvement.
LIFT Procedure (Ligation of Intersphincteric Fistula Tract)
The Ligation of Intersphincteric Fistula Tract (LIFT) procedure ties and divides the fistula tract within the intersphincteric plane (between the two sphincter muscles) without cutting any sphincter muscle.
It is the preferred approach for transsphincteric fistulas where sphincter preservation is required.
Advancement Flap
A flap of healthy rectal tissue is used to close the internal opening of the fistula. This sphincter-preserving technique is suited to complex or high fistulas where fistulotomy carries an unacceptable risk to continence.
VAAFT (Video-Assisted Anal Fistula Treatment)
A minimally invasive technique in which a small scope is passed through the fistula tract. The internal opening is identified and sealed under direct vision, with no sphincter muscle divided.
Fibrin Glue and Fistula Plug
These non-surgical options are used in less severe cases to seal the fistula tract and allow surrounding tissues to heal naturally. Success rates are lower than operative procedures, but neither carries risk to the sphincter muscles.
Which Anal Fistula Operation Is Right for You?
The right operation depends on the fistula’s depth, position, and individual anatomy. Our team will discuss the optimal approach at your consultation.
| Fistula Type | Preferred Procedure | Sphincter Risk | Recovery |
|---|---|---|---|
| Superficial / intersphincteric | Fistulotomy | Low | 2 to 3 weeks |
| Transsphincteric | Seton, LIFT | Managed | 4 to 8 weeks |
| High / complex | Advancement flap, staged procedures | Low (sphincter-preserving) | 6 to 12 weeks |
| Simple fistula | Fibrin glue, fistula plug | Low | Variable |
* Recovery timelines are indicative only and will vary depending on the complexity of the fistula, the procedure performed, and individual healing. A professional consultation is necessary to determine the expected recovery.
Sphincter-Preserving Anorectal Fistula Surgery Singapore: Complex & Recurrent Cases
Complex and recurrent anal fistulas involve higher sphincter muscle, multiple tracts, or complicating conditions such as Crohn’s disease. The central challenge in these cases is closing the fistula without compromising continence.
Why Sphincter Safety Is the Most Important Factor in Fistula Surgery
The anal sphincter muscles control bowel continence. As such, cutting too much sphincter tissue fistula surgery risks incontinence, a life-altering complication.
As such, an approach that prioritises sphincter-sparing techniques, such as seton, LIFT, and advancement flap, is essential whenever the fistula involves significant sphincter muscle.
What Makes a Fistula Complex?
A fistula is considered complex when it:
- Involves more than 30% of the external sphincter
- Has multiple tracts
- Has recurred after a previous operation
- Is associated with Crohn’s disease
- Crosses the puborectalis muscle (suprasphincteric)
These fistulas typically require MRI mapping and a staged surgical plan.
Crohn’s Disease-Related Fistulas
Fistulas arising from Crohn’s disease require a fundamentally different treatment approach to cryptoglandular fistulas.
Medical therapy, including biologics and immunosuppressants, is often combined with surgical drainage to control the fistula, rather than attempting a definitive cure with surgery alone.
A multidisciplinary approach, combining surgical and gastroenterological care, is standard for Crohn’s-related fistulas.
When to Seek a Second Opinion for a Recurrent or Difficult Fistula
Our team offers second opinions for recurrent and complex cases, in which prior fistula surgeries have been unsuccessful.
Dr. Sulaiman is known for managing complex and recurrent anal fistulas that have not responded to previous treatment.
Why Choose Dr. Sulaiman as Your Anal Fistula Surgeon in Singapore?
Choosing the right surgeon for anal fistula treatment matters, particularly for complex or recurrent cases where the right approach is crucial for long-term health.
Dr. Sulaiman brings subspecialist colorectal expertise, the full range of operative techniques, and a consultation style built around clear, unhurried explanation.
Colorectal and Proctology Subspecialist
Dr. Sulaiman is a Senior Consultant colorectal surgeon whose practice spans the full spectrum of anorectal conditions, from simple fistulas to complex, recurrent cases. Fistula and perianal surgery form a core part of his practice.
Full Range of Anal Fistula Operations Under One Surgeon
Dr. Sulaiman offers the complete range of anal fistula operations in Singapore, including fistulotomy, seton placement, LIFT procedure, advancement flap, and VAAFT.
We select the approach that best balances cure rate and sphincter safety for each individual patient.
Medisave, Integrated Shield Plans, and Corporate Insurance Accepted
Anal fistula surgery is Medisave-claimable for approved procedures. Our clinic accepts AIA, Prudential, Great Eastern, Singlife, and NTUC Income integrated shield plans, as well as a range of corporate insurers.
We coordinate pre-authorisation with your insurer directly, so you can focus on your treatment.
Five Private Clinic Locations
Consultations are available at Gleneagles Medical Centre, Mount Elizabeth Novena Hospital, Parkway East Hospital, Mount Alvernia Hospital, and Farrer Park Medical Centre, with appointments typically available within a short waiting period.
Recovery After Anal Fistula Surgery in Singapore
Recovery after anal fistula surgery varies by procedure type. While most patients can go home the same day after simple procedures, complex or staged procedures may require more time and closer follow-up.
Recovery Timeline by Procedure Type
| Procedure | Setting | Recovery |
|---|---|---|
| Fistulotomy | Day surgery | 2 to 3 weeks |
| Seton placement | Staged | Months to full cure |
| LIFT, advancement flap, VAAFT | Day or overnight surgery | 3 to 6 weeks |
* Recovery timelines are indicative only and will vary depending on the complexity of the fistula, the procedure performed, and individual healing. A professional consultation is necessary to determine the expected recovery.
Wound Care
After fistula surgery, your specialist will provide detailed wound care instructions before discharge.
Sitz baths (warm water soaking for 10 to 15 minutes) two to three times daily are recommended to keep the area clean and reduce discomfort.
Daily wound checks at the clinic may also be required in the weeks following fistulotomy.
Diet
A high-fibre diet and adequate fluid intake help keep stools soft and reduce straining at the wound site. Laxatives may be prescribed for the short-term if needed.
When to Call Your Clinic After Surgery
Contact the clinic immediately if you experience fever, heavy bleeding, worsening pain, or difficulty passing urine after surgery.
Preventing Anal Fistulas and Reducing Recurrence Risk
Preventing anal fistulas involves addressing their underlying causes and following through with aftercare post-surgery.
Treat Perianal Abscesses Early
The most effective way to prevent a fistula is to seek prompt treatment for a perianal abscess drainage. Early surgical drainage prevents the fistula tract from forming, so do not allow an abscess to self-rupture or leave it untreated.
Manage IBD and Underlying Conditions
For patients with Crohn’s disease or ulcerative colitis, keeping the underlying condition well controlled reduces the risk of fistula formation.
Maintaining good anal hygiene and a high-fibre diet also lowers the risk of abscess formation.
Post-Surgery Aftercare to Prevent Recurrence
Following your surgeon’s wound care instructions carefully is the most important factor in reducing recurrence risk. Attend regular follow-up appointments so that new tracts can be detected early.
Anal Fistula Treatment in Singapore: Cost, Medisave & Insurance
The cost of anal fistula surgery in Singapore depends on the procedure required, the hospital, and whether the case is simple or complex. For most patients, Medisave and integrated shield plans offset a significant portion of the expense.
How Much Does Anal Fistula Surgery Cost in Singapore?
Costs vary by procedure complexity, hospital choice, and anaesthesia type. Simple fistulotomy performed as day surgery is less expensive than staged complex procedures, such as LIFT or advancement flap with an overnight stay.
Contact our clinic for a personalised fee estimate.
Is Anal Fistula Surgery Medisave Claimable?
Anal fistula surgery is a Medisave-claimable procedure for Singaporeans and Permanent Residents. The claimable amount depends on the TOSP surgical code assigned to your procedure.
Our clinic staff will advise on your specific code and applicable withdrawal limits at consultation.
Does My Integrated Shield Plan Cover Anal Fistula Surgery?
Most Integrated Shield Plans cover anal fistula surgery when medically necessary.
Our clinic is on the panel of major insurers, including AIA, Prudential, Great Eastern, Singlife, and NTUC Income. Where your plan is accepted, cashless billing is arranged through pre-authorisation with your insurer.
Insurance & Medisave Coverage for Anal Fistula Surgery in Singapore
Anal fistula surgery at our clinics is covered by most Integrated Shield Plans and corporate insurance policies, with Medisave available for approved procedures.
Our team arranges pre-authorisation and cashless billing with your insurer before your operation date.
*Extended Panel
About Dr. Sulaiman Bin Yusof: Anal Fistula Doctor & Colorectal Surgeon in Singapore
MbChB (Sheffield)
M.Med (Surgery)
FRCSEd (General Surgery)
蘇萊曼·尤索夫博士
Credentials & Specialist Training
- MBChB (Sheffield)
- M.Med (Surgery)
- FRCSEd (General Surgery)
- MOH Fellowship, Peter MacCallum Cancer Centre, Melbourne
- Visiting Consultant, Changi General Hospital
- 8 peer-reviewed publications
- Member, Singapore Colorectal Society
Perianal and Proctology Surgical Expertise
Dr. Sulaiman manages the full spectrum of perianal conditions, from acute abscess drainage to complex fistula surgery using sphincter-preserving techniques.
His colorectal subspecialty training means anorectal surgery forms a core part of his practice.
Academic Appointments & Patient Recognition
- Adjunct Associate Professor at NUS Yong Loo Lin School of Medicine, Lee Kong Chian School of Medicine, and Duke-NUS Medical School
- Dean’s Honor Roll for Teaching
- Singapore Health Quality Service Star Award 2023
蘇萊曼·尤索夫博士
Dr. Sulaiman Bin Yusof is a Senior Consultant colorectal and general surgeon with over 15 years of specialist experience. He is one of a select group of surgeons in Singapore listed on the da Vinci Xi surgeon locator, reflecting his expertise in robotic-assisted colorectal surgery.
Recipient of the Singapore Health Quality Service Star Award 2023, Dr. Sulaiman is known for clear communication, unhurried consultations, and outcomes-focused care across his five clinic locations in Singapore.
Book an Anal Fistula Consultation with Dr. Sulaiman in Singapore
If you have a persistent discharge near the anus, a recurring abscess in the same location, or a previous fistula that has not fully resolved, a specialist assessment is the right next step.
Dr. Sulaiman can provide an accurate diagnosis and surgical treatment plan that prioritises bowel control. We also accommodate:
- Self-referrals and GP-referred patients
- Same-week appointments
- Second opinions for complex or recurrent cases
- Patients under Medisave and Integrated Shield Plans
Clinic opening hours:
- Monday to Friday: 9AM to 6PM
- Saturday: 9AM to 1PM
- Sunday and public holiday appointments are available on request
Consult our MOH-accredited specialist for an accurate diagnosis & personalised treatment plan today.
Leave us a message and our friendly clinic staff will be in touch with you shortly.
Our Clinic Locations Across Singapore
Gleneagles Medical Centre
6 Napier Road #06-16
Singapore 258499
Mount Elizabeth Novena Hospital
38 Irrawaddy Road, #10-48/49
Singapore 329563
Parkway East Hospital
#05-08, 319 Joo Chiat Place
Singapore 427989
Mount Alvernia Hospital
#08-62, Medical Centre D
820 Thomson Road
Singapore 574623
Connexion
Farrer Park Medical Centre #14-12
1 Farrer Park Station Road
Singapore 217562
Frequently Asked Questions About Anal Fistula Surgery in Singapore
Which Surgeon in Singapore Should I See for Anal Fistula Treatment?
You should see a colorectal specialist in Singapore or proctologist for anal fistula treatment.
Dr. Sulaiman Bin Yusof is an MOH-accredited colorectal surgeon treating anal fistulas at five private clinic locations in Singapore, including patients with complex and recurrent cases requiring staged surgical management.
Can an Anal Fistula Heal Without Surgery?
An anal fistula almost never heals without surgery as it usually does not close on its own while the internal opening to the anal gland remains active.
Therefore, surgery is required to remove or close the tract permanently. Non-surgical options, such as fibrin glue, are suitable only for selected simple cases and carry lower success rates.
What Is the Best Surgery for a Fistula Close to the Sphincter Muscle?
For fistulas involving significant sphincter muscle, sphincter-preserving techniques, such as LIFT procedure, seton, or advancement flap, are preferred over fistulotomy. This is to minimise the risk to bowel control.
The optimal approach is determined by MRI mapping of the fistula anatomy and discussed at consultation.
Is Anal Fistula Surgery Painful, and How Long Is Recovery?
Discomfort after surgery is normal and manageable with prescribed analgesia. Fistulotomy recovery is typically 2 to 3 weeks, while LIFT and advancement flap procedures may require 3 to 6 weeks.
Seton placement is a staged process that can span several months to full resolution.
* Recovery timelines are indicative only and will vary depending on the complexity of the fistula, the procedure performed, and individual healing. A professional consultation is necessary to determine the expected recovery.
Can I exercise with an anal fistula?
Moderate exercise is generally acceptable, but activities that put pressure on the anal area, like cycling or heavy lifting, may aggravate symptoms. Low-impact options, such as walking or swimming, are more suitable during recovery.
Can an anal fistula recur after treatment?
Yes, anal fistulas can recur, especially if an underlying condition, such as Crohn’s disease, is not well managed. Recurrence also depends on the fistula’s complexity and the surgical technique used. Regular follow-up after surgery allows early detection if a new tract is forming.
Can an anal fistula cause more serious health issues if left untreated?
Yes. An untreated fistula can lead to recurring abscesses, increasingly complex fistula tracts, and progressive tissue damage. In rare cases, there is a small risk of malignant change in a long-standing untreated fistula, which warrants a consultation with a colorectal cancer specialist in Singapore.
Can children develop anal fistulas, or does it only affect adults?
Anal fistulas can develop in children, though they are less common than in adults. Fistulas in children are usually simpler in anatomy and may respond to less invasive treatment. A paediatrician or paediatric surgeon should be the first point of contact for a child presenting with perianal symptoms.