What is Ksharsutra and how does it work?

Ksharsutra is a two-thousand-year-old Ayurvedic surgical technique refined in modern practice, used primarily for the treatment of anal fistula. It involves a medicated thread (the Ksharsutra) that is passed through the fistula tract and tied. Over the following weeks, the thread slowly cuts through the fistula tissue while simultaneously promoting healing behind it.

Unlike conventional fistula surgery, Ksharsutra preserves the anal sphincter. This is crucial: the sphincter controls continence, and damage to it during traditional fistula surgery is a well-documented complication. Because Ksharsutra works gradually and heals as it cuts, this risk is substantially reduced.

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Why we recommend Ksharsutra

Ksharsutra is not the fastest fistula treatment available. Laser (FiLaC) is faster in terms of one-time procedure. But Ksharsutra has significantly lower recurrence rates for complex fistulae, and near-zero risk of sphincter damage. For most patients with straightforward fistula, it remains our first recommendation.

Who is Ksharsutra suitable for?

Ksharsutra is our recommended approach for:

It may not be the best choice if you have very superficial fistula (where a simple lay-open procedure would heal in days), or if you are unable to attend weekly hospital visits for 6 to 8 weeks.

Before you start: preparation week

Week 0

Preparation and pre-procedure workup

Once Ksharsutra has been recommended after your consultation, you will be scheduled for a preparation week. During this time we will complete:

  • Blood tests including HbA1c (if you are diabetic, your sugar control must be optimised first)
  • MRI fistulogram or endoanal ultrasound if the anatomy is complex
  • Detailed counselling about what to expect at each stage
  • Dietary preparation guidance (high fibre, plenty of water, avoiding spicy and oily foods)

You will also be given a written booklet to take home, so that family members can support you through the treatment. If you have any concerns after reading it, you can call us before proceeding.

Week 1: First thread application

Week 1

Initial thread application under anaesthesia

The first application is done under spinal or short general anaesthesia, since we need to carefully identify the entire fistula tract, its internal opening, and any branches. This is typically a day-care procedure. You come in the morning and go home the same evening.

What happens on the day

  • Arrive at hospital fasted (no food for 6 hours before)
  • Pre-procedure examination and consent
  • Procedure itself takes 30 to 45 minutes
  • Recovery for 2 to 3 hours
  • Discharge with detailed post-procedure care instructions

The next 3 days

  • Mild to moderate discomfort, managed with oral pain medication
  • Some clear or slightly blood-tinged discharge from the area; this is normal
  • Rest for 2 days, then gradual return to normal light activity
  • Sitz baths (warm water) 2 to 3 times daily
  • No heavy lifting, no cycling, no long walks
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A quiet week works best

Schedule your Week 1 for a time when you can genuinely rest for 3 to 4 days. Even though pain is manageable, your body is healing, and stressing it with meetings or travel slows down the process. Many of our patients take Week 1 as leave and are back to work by Week 2.

Weeks 2 to 4: continued applications

Weeks 2 – 4

Weekly thread changes in OPD

From Week 2 onwards, the thread is changed once every 7 days in the OPD, without anaesthesia. Each change takes about 10 to 15 minutes. There is brief discomfort during the change itself, but no post-procedure pain most times.

Between changes, you can continue almost all normal activities:

  • Work: Desk work is fine from the day of the change. Manual work with heavy lifting should still be avoided.
  • Travel: Short trips are fine. Long-distance travel can be timed around thread change days.
  • Sitting: A soft cushion helps for long sitting periods. Avoid hard chairs.
  • Bathing: Regular showers are fine. Sitz baths after each bowel movement.
  • Diet: Continue high fibre, plenty of water. Avoid constipation-inducing foods.

Ksharsutra is a slow treatment that lets you keep living your life. Most of our patients tell us, by Week 3, that they had expected it to be harder than it is.

Dr. Vipin Tongale

Weeks 5 to 6: cutting through

Weeks 5 – 6

Thread completes the cut, healing begins

By Week 5 or 6, the thread has progressively cut through most of the fistula tract. You may notice:

  • The area where the fistula was is beginning to feel firmer and less sensitive
  • Discharge has reduced substantially
  • The thread may fall off on its own, which is a sign that cutting is complete
  • New tissue can be seen forming where the tract was

We continue weekly follow-up during this phase, but the interventions become minimal, mainly monitoring healing progress.

Weeks 7 to 8: complete healing

Weeks 7 – 8

Final healing and discharge from care

By Week 7 or 8, the fistula tract has completely healed. The area is examined at your final visit. If healing is confirmed:

  • You are formally discharged from active Ksharsutra care
  • A preventive care plan is given for long-term maintenance
  • Follow-up review scheduled at 3 months and 6 months
  • You are given a hospital contact for any concerns

Occasionally, complex or high-position fistulae may need one or two additional weeks. Very rarely, a second Ksharsutra course may be needed for particularly deep tracts. Your case will determine this, and if it is likely, we will tell you at the start, not surprise you at Week 8.

What to expect throughout

Pain

Mild to moderate. Well controlled with oral paracetamol or, occasionally, weak analgesics for the first few days after Week 1. Most patients rate pain at 3 to 4 out of 10 during the first week, dropping to 1 to 2 out of 10 for subsequent weeks.

Discharge

Some clear or slightly blood-tinged discharge is normal, especially in the first 3 weeks. It progressively reduces. Wearing a small gauze dressing is often helpful. Yellow or foul-smelling discharge is not normal and requires a call to the hospital.

Bowel movements

Continue as normal. Do not delay bowel movements, and do not strain. Fibre and water are your priorities. Sitz baths after each bowel movement help substantially.

Work and daily life

Most patients continue work from Week 2 onwards. Long meetings, long drives, and long flights are best avoided in Week 1. From Week 3 onwards, most activities can be resumed with judgement.

When to call the hospital

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Call us immediately if any of these occur

Any of the following symptoms warrant an urgent call to our emergency line at 9405404492:

  • Fever above 100°F (37.8°C)
  • Heavy bleeding (soaking through pads within an hour)
  • Severe pain that is not controlled by oral medication
  • Foul-smelling discharge
  • Difficulty urinating or passing stool
  • Signs of infection (spreading redness, swelling, warmth)

For non-urgent questions or reassurance, our appointment line at 8208927917 is available during OPD hours.

After healing: preventing recurrence

Once healed, your fistula is unlikely to recur if the underlying factors that led to it are addressed. This is why we do not stop at healing. Every Ksharsutra patient receives a preventive care plan that includes:

  1. Long-term dietary guidance: High fibre, adequate water, and avoiding constipation as a permanent priority
  2. Local hygiene: Gentle perianal cleaning after every bowel movement, avoiding rough wiping
  3. Prompt attention to any anal abscess or swelling in future, since untreated abscesses are the most common source of new fistulae
  4. Annual review: A quick anorectal examination once a year to catch any early recurrence
  5. Blood sugar control if you are diabetic (diabetes substantially increases fistula risk)

With this care, most patients never see a fistula again. And if it does happen, you know exactly where to come.

A final note

Ksharsutra requires patience. It is not the fastest treatment. But it is one of the most effective, safest, and most sphincter-preserving options available for fistula. Two thousand years of clinical experience, refined by modern research, applied honestly to the case in front of us. If you are considering Ksharsutra, we are happy to discuss whether it is genuinely the right choice for you.