Most anal fissures heal within a matter of weeks with simple care. If yours has been hanging on for a month or more, there's a specific reason for that — and a clear path forward.
Why Fissures Sometimes Don't Heal on Schedule
A fissure that persists beyond about six to eight weeks is generally classified as chronic, and the reason usually comes down to one mechanism: spasm of the internal anal sphincter muscle. That spasm reduces blood flow to the area, and since healing tissue needs blood flow, the tear struggles to close — creating a frustrating cycle where the spasm that resulted from the fissure is now the thing preventing it from healing.
Signs a Fissure Has Become Chronic
- Symptoms persisting beyond six to eight weeks despite conservative treatment
- A visible skin tag near the fissure (a "sentinel pile")
- Thickened, raised edges to the tear rather than a clean cut
- Pain that remains sharp and significant rather than gradually easing
Stepping Up Treatment for a Chronic Fissure
The goal of treatment for a chronic fissure is specifically to relax that sphincter spasm and restore blood flow, giving the tissue a real chance to heal:
- Topical muscle-relaxant ointments (such as those containing nitroglycerin or calcium channel blockers) applied directly to relax the sphincter
- Botulinum toxin (Botox) injection — temporarily relaxes the sphincter muscle to allow healing, used for fissures that haven't responded to topical treatment
- Lateral internal sphincterotomy — a minor surgical procedure that permanently divides a small portion of the sphincter muscle, breaking the spasm cycle for good; this remains the most effective treatment for a genuinely chronic, resistant fissure
What Still Matters Even With Chronic Fissures
Stool softeners, adequate fiber, and avoiding straining remain important throughout — they don't replace the treatments above for a truly chronic fissure, but they support healing and help prevent a new fissure from forming once the current one resolves.
Dr. Asad's Approach
A fissure that isn't healing on the expected timeline isn't a sign that something has gone wrong with your body — it's simply a sign the sphincter spasm needs direct attention. Treatment is stepped up methodically, with surgery reserved for the cases that genuinely need it.
Frequently Asked Questions
At what point should I stop waiting for a fissure to heal on its own?
If it hasn't meaningfully improved after six to eight weeks of consistent conservative care, it's time to see a doctor about stepping up treatment rather than continuing to wait.
Is sphincterotomy surgery a big operation?
No — it's a minor procedure, often done as a day case, with a good track record for resolving chronic fissures that haven't responded to other treatment.
Can Botox really help a fissure heal?
Yes, for many patients — by temporarily relaxing the spasming sphincter muscle, it gives the tissue the blood flow it needs to close, often avoiding the need for surgery.
Will a healed chronic fissure come back?
It can, particularly if straining or constipation return, which is why ongoing attention to stool softness and bowel habits matters even after healing.
Medically Reviewed by Dr. Muhammad Asad
MBBS · FCPS · CPHQ (USA) · MACHE (USA) — Colorectal & Laparoscopic Surgeon, Associate Professor, 14+ years of surgical experience. About Dr. Asad →
This article is for general patient education and does not replace a professional medical evaluation. If you are experiencing these symptoms, please consult Dr. Asad or another qualified physician for a diagnosis specific to your situation.