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GI and Laparoscopic
An anal fistula, or fistula-in-ano, is an abnormal tunnel connecting the anal canal or rectum to the skin near the anus. It often develops after an anal abscess. Treatment depends on the fistula's anatomy, complexity, relationship to the anal sphincter and the patient's individual circumstances.
Updated: August 2026 | Department: GI & Laparoscopic Surgery
The fistula tract and its relationship to the sphincter help determine which treatment is appropriate and how continence can be protected.
Most anal fistulas require a procedure or surgery because they usually do not close permanently on their own. Simple fistulas may be treated with fistulotomy, while complex fistulas may need a seton or sphincter-preserving procedures such as LIFT or an advancement flap. Minimally invasive laser or endoscopic closure techniques are available in selected cases, but their long-term healing and recurrence outcomes remain less certain than established approaches.
An anal fistula is an abnormal tunnel between an opening inside the anal canal and an opening in the skin around the anus. It commonly develops after an anal abscess caused by infection of an anal gland.
A fistula may cause intermittent swelling, pain and drainage. The external opening can sometimes close temporarily and then reopen when fluid or infection builds up again.
The treatment plan depends on whether the fistula is simple or complex, how much of the anal sphincter is involved, whether there is an abscess, and whether conditions such as Crohn's disease are present.
Symptoms vary according to the location and complexity of the fistula. Recurrent drainage from an opening near the anus is a common feature.
Pus, fluid or discharge may come from a small opening in the skin near the anus.
Pain may occur when a fistula becomes blocked, inflamed or associated with an abscess.
A visible skin opening, swelling or lump may occur around the anus.
Fever or chills can occur when an associated infection or abscess develops.
Swelling may improve after drainage and then return if the underlying tract remains.
Repeated discharge can irritate the skin around the anus and cause discomfort or itching.
Most anal fistulas develop after an infection in an anal gland causes an abscess. Other diseases and injuries can also contribute.
An abscess can develop when an anal gland becomes infected. After an abscess drains or is treated, a persistent tunnel may remain and form a fistula.
Crohn's disease can cause perianal fistulas. Management may require both medical and surgical treatment depending on the individual situation.
Injury or previous procedures involving the anorectal area can sometimes contribute to fistula formation.
Certain infections and, rarely, malignancy can be associated with anorectal fistulas and may require additional investigation.
Diagnosis begins with a medical history and physical examination. Imaging is considered when the tract is complex, recurrent, hidden or associated with Crohn's disease.
The doctor examines the skin around the anus for an external opening, tenderness, inflammation, swelling or drainage.
A digital rectal examination or anoscopy may help assess the anal canal and identify associated abnormalities when appropriate.
MRI, ultrasound, CT or fistulography may be considered for complex, recurrent or occult fistulas and selected patients with Crohn's disease.
Knowing the course of the fistula and its relationship to the anal sphincter helps the surgeon choose a treatment that balances healing with preservation of continence.
The appropriate treatment depends on fistula anatomy, complexity, sphincter involvement, associated abscesses, previous procedures and underlying diseases. There is no single procedure suitable for every fistula.
Fistulotomy opens the fistula tract so it can heal from the base outward. It is commonly considered for selected simple fistulas where dividing the involved tissue is unlikely to compromise continence.
Often used for selected simple fistulasA seton is passed through the fistula tract to maintain drainage or gradually manage the tract. It can be useful in selected complex fistulas, particularly when immediate division of sphincter muscle would carry unacceptable risk.
Used in selected complex fistulasLigation of the intersphincteric fistula tract, or LIFT, is a sphincter-preserving approach designed to treat selected transsphincteric fistulas without laying open the entire tract.
Sphincter-preserving optionAn advancement flap uses healthy tissue to cover the internal opening of a fistula. It may be considered for selected higher or complex fistulas when fistulotomy is unsuitable.
For selected complex fistulasFibrin glue and fistula plugs are sphincter-preserving techniques that may be considered in selected cases. Their effectiveness can vary and they are not appropriate for every fistula.
Selected casesLaser closure and endoscopic techniques such as FiLaC or VAAFT may be considered in selected patients. Current guidance notes reasonable short-term healing results, while long-term healing and recurrence outcomes remain less certain.
Minimally invasive option in selected casesFistulas differ in their location, number of tracts and relationship to the anal sphincter. A treatment that is appropriate for a simple fistula may not be suitable for a complex or recurrent fistula. The surgical plan should therefore be based on examination and, when needed, imaging.
In patients with Crohn's disease, treatment may require coordinated medical and surgical care rather than surgery alone.
An abscess commonly causes pain, swelling, redness and sometimes fever. When an abscess is present, drainage is usually the key treatment to control the infection.
A fistula is a tract connecting the anal canal or rectum to the skin. It may continue to drain and often requires definitive treatment after the acute infection is controlled.
Recovery varies with the procedure, fistula complexity and the patient's overall health. Your surgeon will provide specific wound-care and activity instructions.
Keep the area clean and follow the dressing or wound-care instructions provided by the surgical team.
Warm sitz baths may be recommended to improve comfort and support local hygiene.
Follow dietary, fluid and stool-management advice to avoid excessive straining.
Attend scheduled follow-up visits so healing and any recurrent drainage can be assessed.
Severe anal pain with increasing swelling, fever or feeling unwell may indicate an abscess that needs prompt medical assessment and possible drainage.
Meet the surgeon providing general, gastrointestinal and laparoscopic surgical care at My Health Hospitals, Hyderabad.
General & Laparoscopic Surgeon
Dr. Krishna Chaitanya Vattem is a General and Laparoscopic Surgeon at My Health Hospitals, Hyderabad. His clinical practice includes general and gastrointestinal surgical care, including evaluation and treatment planning for anorectal conditions such as anal fistula.
For patients with suspected or recurrent anal fistula, the treatment plan is based on clinical examination and, when required, assessment of the fistula tract and its relationship with the anal sphincter. Depending on the individual case, treatment may involve fistulotomy, seton placement, LIFT, advancement flap or another appropriate surgical approach.
Most anorectal fistulas do not close permanently without treatment. A healthcare professional should assess the fistula, especially when there is recurrent drainage, swelling or pain.
An anal fistula most often develops after an anal abscess caused by infection of an anal gland. Crohn's disease, trauma, radiation and some other conditions can also contribute.
Common symptoms include recurring drainage or pus from a skin opening near the anus, pain, swelling, redness, irritation and sometimes fever or chills when infection is present.
Most anal fistulas require a procedure or surgery for definitive treatment. The specific approach varies widely. Some patients need fistulotomy, while others may need a seton, LIFT, advancement flap or another sphincter-preserving approach.
Laser closure is a minimally invasive technique that uses energy to treat the fistula tract. It may be considered for selected patients, but current clinical guidance notes that long-term healing and recurrence outcomes are less certain than for established surgical approaches.
LIFT stands for ligation of the intersphincteric fistula tract. It is a sphincter- preserving procedure used for selected fistulas, particularly certain transsphincteric tracts.
Yes. Recurrence is possible and depends on factors such as fistula complexity, location, associated disease, previous operations and the treatment used. Follow-up is important to monitor healing and recurrent drainage.
Seek medical evaluation for recurrent pus or fluid drainage, a persistent opening, repeated swelling or pain, fever, or symptoms returning after previous treatment. Severe pain with fever or rapidly increasing swelling may indicate an abscess needing prompt care.
A specialist evaluation can help identify the fistula tract and determine whether surgery, a seton or a sphincter-preserving approach is appropriate.
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