Understanding Why Anal Fissures Recur and How to Prevent Them
Why Do Some People Get Recurrent Anal Fissures?
Introduction
Does your anal fissure seem to heal, only to tear open again during your next bowel movement? The sharp pain, burning, and bleeding can make even going to the toilet frightening. If this keeps happening, the problem may be more than constipation or hard stools. A chronic anal fissure can become trapped in a cycle of muscle spasm, reduced blood flow, and repeated tearing. Understanding this cycle is the first step towards finding treatment that provides lasting relief.
Struggling With Recurrent Anal Fissures?
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Why Does an Anal Fissure Keep Tearing Open?
An anal fissure is a tear in the delicate lining of the anal canal, known as the anoderm.
An initial tear often develops after passing hard stools, straining, or experiencing frequent diarrhoea. But why does it keep reopening?
The answer often lies in the pain-spasm-ischemia cycle.
The Pain-Spasm-Ischemia Cycle
1. Anal Fissure Causes Pain
The tear exposes sensitive nerve endings.
2. Internal Sphincter Spasm
The muscle contracts involuntarily and increases anal pressure.
3. Reduced Blood Supply (Ischemia)
Less oxygen reaches the injured tissue, slowing healing.
4. Fragile Tissue Tears Again
The next bowel movement may reopen the fissure and restart the cycle.
Cycle repeats
The posterior midline of the anal canal has relatively limited blood supply, making fissures in this area particularly vulnerable to delayed healing.
This explains why stool softeners alone may not resolve a chronic fissure. Treatment may also need to reduce sphincter pressure.
2. Acute vs. Chronic Anal Fissures: What's the Difference?
Not every anal fissure behaves the same way.
| Feature | Acute Anal Fissure | Chronic Anal Fissure |
|---|---|---|
| Duration | Usually under 6 weeks | Usually over 6–8 weeks |
| Appearance | Fresh, shallow tear | Deeper tear with established tissue changes |
| Muscle fibres | Usually not visible | Internal sphincter fibres may be exposed |
| Sentinel pile | Usually absent | May develop externally |
| Hypertrophied anal papilla | Usually absent | May develop internally |
| Treatment | Often heals with conservative care | May require sphincter-relaxing treatment or a procedure |
A chronic fissure may have a sentinel pile, which is a small skin tag near the outer edge. A hypertrophied anal papilla may develop inside the anal canal.
These changes help doctors distinguish a longstanding fissure from a fresh injury.
What Causes Recurrent Anal Fissures?
Several factors can restart the tearing process.
Chronic Constipation and Hard Stools
Hard stools stretch the anal canal and damage healing tissue. Even one difficult bowel movement can reopen a fissure.
Frequent diarrhoea
Repeated loose stools irritate the anal lining. Frequent wiping can increase discomfort and interfere with healing.
Increased Anal Sphincter Pressure
Some patients have persistently elevated resting sphincter pressure. This restricts blood flow and makes healing difficult, even when stools are soft.
Underlying Medical Conditions
Crohn's disease and certain infections can cause unusual or persistent anal fissures.
Most typical fissures occur at the posterior midline, around the 6 o'clock position, or anteriorly, around 12 o'clock.
Fissures away from these positions, particularly lateral fissures, require further assessment.
Conditions such as Crohn's disease, tuberculosis, HIV-associated disease, and syphilis may need consideration depending on the clinical findings.
Why Do Some Anal Fissure Treatments Fail?
A common reason for treatment failure is addressing the pain without treating the underlying sphincter spasm.
Prescription creams
Doctors may prescribe topical medications that relax the internal anal sphincter.
- Nitroglycerin (GTN): Improves blood flow by reducing sphincter pressure. Headaches are a common limitation, affecting roughly 30–40% of patients in some studies, depending on the formulation and dose.
- Diltiazem 2%: A topical calcium channel blocker that relaxes the sphincter. It is often preferred because it generally causes fewer headaches than GTN.
- Nifedipine: Another calcium channel blocker used in topical formulations to reduce sphincter pressure.
These medications usually require several weeks of consistent treatment under medical supervision.
Botox injections
Botulinum toxin temporarily relaxes the internal anal sphincter.
It may help patients who cannot tolerate topical medication or whose fissures remain unhealed.
Healing rates vary across studies, and recurrence is possible when the injection's effect wears off.
Lateral internal sphincterotomy
For selected patients with chronic fissures that resist medical treatment, lateral internal sphincterotomy (LIS) may be recommended.
The procedure partially divides the internal anal sphincter to reduce resting pressure and improve blood flow.
Healing rates commonly exceed 90% in appropriately selected patients.
The main concern is a possible change in bowel control, including difficulty controlling gas or minor stool leakage. Reported rates vary substantially with patient selection, surgical technique, and follow-up duration.
A surgeon should assess existing continence problems, previous childbirth injuries, and sphincter function before recommending LIS.
When Should You See a Surgeon for Recurrent Anal Fissures?
Repeated bleeding and severe pain should not become part of your normal routine.
Seek medical evaluation if you experience:
- Pain that continues for hours after bowel movements
- A fissure that persists beyond six weeks
- Repeated reopening despite treatment
- Persistent rectal bleeding
- A visible skin tag with ongoing fissure symptoms
- Multiple fissures or tears in unusual positions
Fever, swelling, pus discharge, or rapidly worsening pain may indicate an abscess or another condition requiring urgent assessment.
Painless rectal bleeding also deserves evaluation rather than being automatically attributed to a fissure.
A General & Laparoscopic Surgeon in Mumbai can evaluate the cause of recurring symptoms and discuss suitable medical or surgical options.
How Can You Reduce the Risk of Another Anal Fissure?
Preventing recurrence requires more than simply eating extra fibre.
Choose the Right Fibre
Soluble fibre, found in oats, psyllium husk, and certain fruits, absorbs water and helps regulate stool consistency.
Insoluble fibre, found in whole grains and vegetables, adds bulk.
Increasing fibre too quickly can cause bloating and discomfort. Adjust your intake gradually, particularly if constipation is severe.
Maintain Adequate Hydration
Drink enough fluids to support soft stools. Fluid requirements vary with body size, activity, weather, and medical conditions. Not everyone needs three litres daily.
Avoid Prolonged Toilet Sitting
Do not strain or spend long periods sitting on the toilet. If stool does not pass easily, avoid forcing it.
Use Warm sitz baths
Sitting in comfortably warm water for 10–15 minutes, particularly after bowel movements, may ease pain and sphincter tension.
These measures support healing but may not replace prescription treatment when a chronic fissure involves persistent sphincter spasm.
Patient educational video
Frequently Asked Questions About Recurrent Anal Fissures
Persistent internal sphincter spasm can reduce blood flow and delay healing. Fragile tissue may reopen even when your stools are relatively soft.
Yes. Prescription creams, bowel management, and Botox injections can help many patients. Surgery is considered when nonsurgical treatment fails or is unsuitable.
Both can promote healing by relaxing the sphincter. Diltiazem generally causes fewer headaches, making it a suitable option for many patients. Your doctor can recommend the appropriate medication.
Lateral internal sphincterotomy has high long-term healing rates, but recurrence remains possible. Patients should also discuss the risk of continence changes before surgery.
An anal fissure does not normally turn into cancer. Some anal cancers can produce similar symptoms, so persistent or unusual lesions require examination.
No. A sentinel pile is a skin tag associated with a chronic anal fissure. Haemorrhoids are swollen vascular cushions in or around the anal canal.
Consult a surgeon when pain, bleeding, or fissure recurrence continues despite appropriate treatment, or when symptoms suggest another anorectal condition.
Conclusion
Recurrent anal fissures are not always caused by repeated constipation. In many chronic cases, the real problem is the cycle of pain, internal sphincter spasm, reduced blood supply, and delayed healing. Breaking this cycle may require more than dietary changes or temporary pain relief. Prescription medications, Botox injections, and selected surgical procedures can help patients whose fissures repeatedly reopen. If you are struggling with persistent anal pain or bleeding, seeking an evaluation at Dr Das Multispeciality Hospital can help identify the cause and guide you towards appropriate treatment. With timely care, lasting healing and more comfortable bowel movements are achievable.
List of Consultants
Dr. Debashish M. Das
M.S., M.Ch., F.M.A.S.
GI Endoscopist & Laparoscopic General Surgeon