From a sitz bath to the operating room.
Most fissures heal with conservative care. Most fistulas need surgery. The path between those two facts is where most of the decisions live.
What helps most fissures heal on their own.
For an acute fissure, simple measures resolve the problem most of the time. The mechanism is straightforward: soften the stool so it no longer re-injures the tissue, calm the sphincter so blood can reach the wound, and give it time.
The non-negotiables
- Fibre. Aim for 25–35 g per day from food, supplemented as needed with psyllium or methylcellulose. Increase gradually over a week or two to avoid bloating.
- Fluids. Adequate water — fibre without fluid hardens stool, the opposite of what you want.
- Stool softeners. A short course (a few weeks) of an osmotic agent like macrogol/PEG can make a real difference.
- Sitz baths. 10–15 minutes in warm water, two to three times a day, especially after bowel movements.
- Toilet habits. Don't read on the toilet. Don't strain. Don't postpone the urge to go, but don't sit there waiting either.
Topical medications
- Glyceryl trinitrate (GTN) ointment — relaxes the internal sphincter and increases local blood flow. Effective; main side effect is headaches, which are dose-related.
- Topical calcium-channel blockers (diltiazem, nifedipine) — work by a similar mechanism with fewer headaches; often preferred when available as a compounded preparation.
- Topical anaesthetics (lidocaine) — useful for short-term pain relief; not curative.
These should be used consistently for several weeks, not just during the worst pain.
The next step for chronic fissures.
Botulinum toxin injection
An injection of small doses of botulinum toxin into the internal sphincter relaxes the muscle for several months — a chemical "rest" that often allows the fissure to heal. It's a brief office procedure with minimal recovery. Cure rates are good, though somewhat lower than surgery, with a small risk of temporary mild incontinence.
Lateral Internal Sphincterotomy (LIS)
A small, controlled cut in the lower portion of the internal sphincter to permanently reduce resting pressure. This is the surgical gold standard for chronic fissures: very high cure rates (>90%), short recovery, performed as a day-case procedure under general or local anaesthesia. The trade-off is a small risk of long-term changes in continence — usually involving gas or occasional staining rather than solid stool — and selecting the right candidate is important.
Anal advancement flap
For patients in whom sphincterotomy carries higher risk (women after multiple childbirths, those with existing continence concerns), an advancement flap covers the fissure with healthy tissue while preserving the sphincter. Less common but a reasonable option in selected cases.
Sealing the tunnel.
Anal fistulas almost always need surgical treatment. The right operation depends on the fistula's anatomy — how high it is, how much sphincter it crosses, whether it's branched, whether there are underlying conditions like Crohn's disease. MRI is often used to map the tract before surgery.
Fistulotomy
The classic operation for a simple, low fistula: the tract is opened ("laid open") and allowed to heal from the inside out. Excellent cure rates for the right anatomy. Not used when too much sphincter would have to be divided, because of the continence risk.
Seton placement
A soft thread is threaded through the fistula. There are two broad uses: a loose draining seton keeps the tract open so it cannot abscess, calming inflammation before definitive surgery; a cutting seton is gradually tightened to slowly divide the sphincter, allowing healing behind it. Setons are often a long-term measure in complex disease.
LIFT (Ligation of Intersphincteric Fistula Tract)
A sphincter-preserving operation in which the tract is identified between the internal and external sphincters, then ligated and divided. Good results for transsphincteric fistulas without dividing significant sphincter muscle.
Endorectal advancement flap
The internal opening is covered with a flap of healthy rectal tissue, sealing it from the inside. Sphincter-preserving; cure rates vary depending on selection.
Newer and minimally invasive techniques
- VAAFT (Video-Assisted Anal Fistula Treatment) — a tiny camera visualises the tract from the inside, allowing it to be identified and obliterated.
- Fibrin glue / fistula plugs — biological materials filling the tract; appealing for low morbidity, though success rates are inconsistent.
- FiLaC (laser closure) — laser energy used to seal the tract.
- Stem cell therapy — particularly studied in Crohn's-related fistulas, with promising trial data.
Trade-offs are real: the most reliable techniques carry the highest continence risk, while the most muscle-sparing techniques have higher recurrence rates. The choice belongs in a careful conversation with an experienced colorectal surgeon.
What to expect afterwards.
Recovery from anorectal surgery is uncomfortable but, for most procedures, briefer than people fear.
Common expectations
- Pain that is real but controllable, peaking in the first few days and easing significantly within 1–2 weeks.
- Some bleeding and discharge for several days as the wound heals from inside out.
- The first bowel movements are often dreaded; stool softeners, sitz baths, and pain relief make them manageable.
- Most people return to office work in 1–2 weeks, physical work in 3–4 weeks, depending on the procedure.
- Wounds may take 6–8 weeks (sometimes longer for fistulas) to fully heal.
What helps recovery
- Daily sitz baths and gentle perineal hygiene.
- Continuing stool softeners and high-fibre intake to keep stools soft.
- Walking — light movement reduces stiffness and supports healing.
- Avoiding heavy lifting, strenuous exercise, and prolonged sitting until your surgeon clears it.
- Following up — even when you feel fine — so any concerns are caught early.