The Complication Nobody Talks About in Public
A fistula is the part of Crohn's people do not post about. The discharge. The pad you now wear, every day. The pain sitting down, sitting through a meeting, sitting through dinner with people you love. The smell you are certain everyone can detect. The abscesses that keep coming back in the same place. The way it has quietly taken your sex life and your confidence with it.
This page is written on the assumption that you already know how bad it is, and that what you want is an explanation and an honest answer.
First: Rule Out an Abscess
Before anything else. If you have fever, chills, increasing pain, a hot tender swelling, difficulty passing urine, or you feel systemically unwell, you may have an abscess. That is a hospital emergency and it needs drainage — now, not after a consultation with us. Read our page on abscesses. Nothing here is a substitute for drainage, and an undrained collection can become sepsis quickly.
Why Crohn's Makes Tunnels
Most bowel inflammation is superficial. Crohn's is transmural — it goes through the entire thickness of the wall.
It begins as a deep fissuring ulcer. Instead of spreading sideways across the mucosa, the inflammation drives downwards, through the mucosa, through the muscle layer, and eventually out the other side. Once it has broken through, it does what any pressurised process does: it follows the path of least resistance through the tissue plane, and it forms a tract.
Where that tract ends determines what you are living with:
- Perianal fistula — from the anal canal or rectum out to the skin around the anus. The most common, the most disabling day to day, and often the first sign of Crohn's in some people.
- Enterocutaneous fistula — from the bowel out through the abdominal wall, often at an old surgical scar. Intestinal contents on your skin.
- Enteroenteric — bowel to bowel, bypassing a segment. It can be silent, or it can cause diarrhoea and malabsorption because food skips the absorbing segment altogether.
- Enterovesical — bowel to bladder. Recurrent urinary infections, and air or debris in the urine. This one needs surgical assessment.
- Enterovaginal / rectovaginal — the most distressing, and it requires specialist surgical input.
Why Local Repair Fails While the Driver Is Still Running
This is the question every fistula patient eventually asks: they closed it, so why did it come back?
Think about what a tract actually is. It is a channel running from a high-pressure, actively inflamed segment of bowel to a low-pressure point outside. The bowel end is the source. The skin end is only the exit.
Close the exit while the source is still inflamed, still leaking, still under pressure — and often with a narrowing downstream that raises pressure inside the bowel even further — and you have sealed a pipe that is still being pumped into. It will re-open, or it will find a new route, or it will collect into an abscess behind the closure. This is precisely why repeated local repairs can fail, and why the same site abscesses again and again.
This is also why the modern surgical approach is often not to close it immediately, but to place a seton to keep it draining safely while the inflammation is brought down medically. Your surgeon is not stalling. They are refusing to seal a pipe that is still under pressure.
Those interventions — examination under anaesthesia, seton drainage, pelvic MRI, antibiotics, biologics, and in some cases surgery — are appropriate, and we do not perform them and do not argue against them. Keep your surgeon and your gastroenterologist. We work alongside them.
What Root-Cause Correction Addresses
Our target is the source, not the exit: the failing gut barrier and the innate immune response that cannot clear what crosses it, which is what drives transmural inflammation in the first place.
- Phase L — Inflammatory Load Reduction (oral, 4–8 weeks). Lower the systemic inflammatory load. Tissue that is being actively broken down cannot be repaired at the same time.
- Phase I — Internal Correction (oral, 8–16 weeks). Barrier repair, microbial environment, immune recalibration — reducing the inflammatory pressure at the bowel end of the tract, which is the only end that matters.
- Phase E — External Tissue Repair (topical, at home) for the broken-down perianal skin around the tract — never applied into an open cavity, a wound or a drain site, and only when your surgeon is content.
- Phase F — Functional Clearance (oral, 6–12 weeks), only once L and I are stable.
- Phase S — Remission Maintenance (tapered oral, 6–12 months).
All oral or topical. There is no procedure and no clinic visit at any stage.
The Honest Part
Established fistulising disease is complex, and response varies widely. We are not going to pretend otherwise.
A single, simple, recently formed tract behaves very differently from a complex, branching, long-standing tract with a thick fibrotic lining and a history of repeated abscesses. Some people see meaningful change: less discharge, less pain, fewer abscess episodes, better skin, and a lower inflammatory burden overall. Some tracts quieten but do not close. Some do not respond, and continue to need surgical management.
If you have severe penetrating disease or extensive prior resection, full remission may not be achievable. In that case the honest goal we work towards is a lower inflammatory burden and a lower medication load — and we will tell you which category we think you are in at the assessment, not six months later.
Red Flags — Go to Hospital
Fever, chills, rapidly worsening pain, spreading redness, a tense swelling, inability to pass urine, or feeling seriously unwell. That is an abscess or sepsis. Go now.
Next Step
Book a video or WhatsApp consultation. Bring your pelvic MRI report and your surgical history. Formulations are couriered to you, wherever you live.
