Is Anal Fistula Dangerous? What Happens If Left Untreated?

Let me answer the question honestly: anal fistula is not a disease that threatens your life today or tomorrow, like a heart attack. But I can't call it "harmless" either. The real danger of a fistula lies in its silence — because it doesn't rush the patient to the emergency room, it gets postponed for months, sometimes years. And with every month it's postponed, the fistula turns into a somewhat harder disease.

The four costs of waiting

1. The tunnel branches

A tunnel that starts out single and straight can, under the pressure of accumulating inflammation, open side paths for itself. While a single-branch fistula can be closed with laser in half an hour, a branched fistula requires MRI for mapping, sometimes multiple sessions, and a far more laborious surgery. The difference between a patient who comes early and one who comes late is often bigger than the surgery itself.

2. Abscesses recur

The skin opening of the tunnel occasionally clogs; the inflammation building up inside turns into an abscess again. Each flare-up ends with that throbbing pain and sometimes emergency drainage. It's not uncommon for a patient to go through three abscess attacks before finally learning they have a fistula.

3. The risk of muscle damage grows

The ring of muscle that keeps the anus closed is the structure that most needs protecting during fistula treatment. As inflammation and branching spread around this muscle, both the disease itself and delayed treatment can leave marks on it. A tunnel that doesn't touch the muscle at all in the early stage can turn into a network running straight through the middle of the muscle in a late stage.

4. Rare but real: malignant transformation

In fistulas left untreated for many years, the development of cancer at the base of the tunnel has been documented in the literature. I'm not saying this to cause panic — it's rare and typically reported in cases neglected for over a decade. But this point also sums up why the phrase "you can live with a fistula" is wrong.

The "my symptoms eased, maybe it's healing" misconception

The most deceptive trait of a fistula is that it quiets down periodically. Discharge stops, the soreness disappears; the patient believes they're healing. Yet the tunnel is still exactly where it was — only its opening has temporarily scabbed over. A quiet period is actually the best time for treatment: a procedure done while there's no active inflammation is simpler, and healing is more comfortable. I always tell my patients: let's catch the fistula while it's calm, not while it's flaring.

When is it an emergency?

Take the following combination seriously and seek care the same day: fever above 38°C, throbbing that intensifies within hours, spreading redness and firmness around the anus, and a general feeling of being unwell. This can indicate that the inflammation is progressing into deeper tissue; it's a rare but serious picture, and it shouldn't be delayed.

Frequently asked questions

Some people live with a fistula for years; couldn't I too?

You could — but with a growing bill. Branching, recurring abscesses, and increasingly difficult surgery eventually catch up with every patient who waits. Today's simple tunnel is tomorrow's difficult operation.

Can a fistula turn into cancer?

This risk has been documented in fistulas left untreated for a very long time; it's rare. The real, current risk is recurring abscesses and the tunnel becoming more complex.

Can't we just keep it under control with antibiotics?

Antibiotics calm a flare-up; they don't close the tunnel. In a fistula, antibiotics are a tool that accompanies treatment when needed — not a substitute for it.

What should I do to avoid the worst-case scenario?

Simple: get examined the moment you suspect something. In its early stage, fistula treatment is mostly an incision-free, same-day laser procedure. What the person who waits loses, before their health, is their comfort.

If you're unsure, think of it this way: an examination takes ten minutes, while every month spent in uncertainty is a burden of its own. For questions, call 444 8 623 — let's clarify this together at our clinic in Levent. For treatment options, take a look at this page.

References

• American Society of Colon and Rectal Surgeons (ASCRS), fascrs.org
• NHS — Anal Fistula patient information, nhs.uk