What an anal fistula is
An anal fistula is an abnormal tunnel that runs from inside the anal canal to the skin surface, and it usually develops after an abscess in the anal region. It has an internal opening inside the canal and an external opening visible on the skin nearby.
The process typically begins when one of the small glands in the anal canal becomes blocked and infected. The infection spreads into the surrounding tissue and forms an abscess. Once the abscess is drained, surgically or spontaneously, the pain settles quickly, but in a proportion of patients the track it travelled along fails to close and a permanent tunnel is left behind. That tunnel is the fistula, which is why most patients describe an episode of severe pain and swelling some months earlier.
Fistulas are classified by their relationship to the anal sphincter muscles. A superficial tract running below the muscle is a very different problem from one passing through or above it, and the two are not treated the same way. We also consider whether the fistula is part of an inflammatory bowel condition such as Crohn's disease.
Symptoms and when to seek help
The most characteristic symptom is discharge from a small opening in the skin near the anus. It may be purulent, blood-stained or faecal, it stains underwear, and for most patients it is this constant dampness rather than pain that dominates daily life. Itching, moisture and skin irritation are common.
The second common pattern is recurring painful swelling. When the external opening blocks temporarily, pus builds up and pain and swelling increase; once it drains, the symptoms subside again. These fluctuations are exactly why many people wait for years, hoping each episode was the last.
Waiting has a cost. Untreated fistulas can branch, forming new tracts and new abscesses. A problem that could have been managed as a simple fistula becomes a complex one, which makes surgery more demanding and treatment longer. If you have discharge that does not settle or swellings that keep returning, embarrassment is not a reason to delay: for us this is a routine assessment.
Making the diagnosis
The diagnosis is usually clinical. The position of the external opening gives a strong indication of where the internal opening is likely to be. Examination assesses induration in the area, the nature of the discharge and any associated abscess; digital rectal examination and, where appropriate, anoscopy complete the picture.
Imaging is used when the relationship to the sphincter is unclear, and for recurrent fistulas or those with multiple openings. Pelvic MRI fistulography shows the course of the tract and its relationship to the muscles in detail; endoanal ultrasound is preferred in some cases. The point of this step is to operate from a map rather than an assumption. If an underlying inflammatory bowel condition is suspected, further investigation is arranged before treatment is planned.
Surgical options
An anal fistula does not close permanently with medication; treatment is surgical. Fistula operations are performed to close the tract and reduce the risk of ongoing infection, and involve careful handling of the tunnel itself along with clearance of the surrounding area. Every technique is judged against two goals at once: durable closure of the tract, and preservation of the muscles that maintain continence.
Where the tract runs superficially, laying it open and allowing it to heal from the base (fistulotomy) may be appropriate. Where a significant amount of sphincter is involved, dividing it in one stage is not, and a suture or silicone loop (seton) is passed through the tract to control infection while treatment proceeds in stages. Sphincter-preserving techniques include ligating and dividing the tract between the muscle layers (LIFT), closing the internal opening with a flap of healthy tissue, and closing the tract from within using laser energy.
No single technique suits every fistula. The right one depends on the course of the tract, previous operations, the condition of the sphincter and your individual continence risk, and it is chosen after examination and imaging, in discussion with you.
- Fistulotomy for superficial tracts
- Seton placement to control infection and allow staged treatment
- LIFT: ligation of the tract in the intersphincteric plane
- Advancement flap to close the internal opening
- Laser and other sphincter-preserving closures
Recovery and follow-up
Regular follow-up after surgery is important, and the reason is specific to this operation: the wound has to heal from the depth outwards, in the right order. If the surface closes while a cavity remains beneath it, the problem tends to recur. Review appointments allow us to check that healing is progressing correctly and to intervene early if it is not.
Wound care is a large part of recovery. Keeping the area clean and dry, warm sitz baths and following the dressing instructions all matter. Pain is usually noticeable in the first days and is managed with regular analgesia; keeping the stool soft makes the period considerably easier.
Healing time varies substantially with the type of fistula and the technique used, being shorter for simple tracts and longer for complex ones, and it differs from patient to patient. Some complex fistulas are treated in more than one stage. That is not a setback but a deliberate strategy chosen to protect the sphincter.
Anal fistula care at İzmir Cerrahi Merkezi
At İzmir Cerrahi Merkezi, anal fistulas are treated on the basis of a plan made once the anatomy of the tract is understood. Our surgeons discuss the available techniques and their possible effect on continence openly before deciding with you. Long-standing fistulas, and those that have been operated on before or have recurred, are assessed in the same structured way.
We practise at Güneşli Mah. 507 Sok. No: 3, Konak, İzmir. To arrange an assessment, call 0538 508 3872. The information on this page is general; treatment decisions are individual and require an examination.
Frequently asked questions
Can an anal fistula be cured with antibiotics?
Antibiotics can help during an abscess or to control surrounding infection, but they do not close an established tract. Definitive treatment is surgical. Where a fistula is related to inflammatory bowel disease, medical treatment of the underlying condition is planned alongside surgery.
My abscess was drained and the pain went. Do I still need surgery?
Pain settles quickly after drainage, but in a proportion of patients a fistula tract remains. If discharge continues or swelling keeps returning, a fistula is likely and should be assessed. If symptoms have resolved completely, observation may be enough.
Is there a risk to bowel control after fistula surgery?
The risk depends on how much sphincter the tract involves and which technique is used. Where the tract passes through muscle, sphincter-preserving methods are chosen rather than simply dividing it, which is precisely why mapping the tract beforehand matters so much. Risk is assessed individually and discussed with you before surgery.
Can a fistula come back after surgery?
Yes, particularly with complex or previously operated fistulas. Accurate mapping, choosing an appropriate technique and careful post-operative wound care are the main factors that reduce that risk.
How long does healing take?
Simple fistula wounds usually heal over a few weeks, while complex tracts take longer, and it varies from patient to patient. Where staged treatment is needed, the overall process can extend over months as a planned part of the treatment rather than a complication.
When can I return to work?
After surgery for a simple fistula, most people return to desk-based work fairly quickly; heavy physical work, prolonged sitting or a lot of driving may require longer. We give you a realistic expectation for your case before the operation.