Anal Fissure
Specialist Diagnosis & Management

Common

Affects all ages and both sexes

>95%

Surgical cure rate

Treatment

Day case, no hospital stay required

— What is an Anal Fissure?

Understanding Anal Fissures

An anal fissure is a small tear in the thin, moist tissue (mucosa) that lines the anus. While common, the discomfort it causes can be significant, often interfering with daily activities and quality of life. My approach is to provide a precise diagnosis and a tailored plan that prioritises non-invasive recovery wherever possible.

Fissures are often mistaken for haemorrhoids. The key difference is that fissures typically cause intense pain during and after a bowel movement, whereas internal haemorrhoids are usually painless. Getting an accurate diagnosis early is important, as an untreated acute fissure can become a chronic one, which is significantly harder to treat.

 

Acute Fissure

Acute Anal Fissure

Present for less than 6 weeks. Fresh tear with sharp edges. Responds well to conservative treatment. Most acute fissures heal completely with the right management.

Chronic

Chronic Anal Fissure

Persisting beyond 6 to 8 weeks. Often develops a sentinel skin tag at the lower edge. More likely to require medical or surgical intervention to achieve full healing.

— Recognising an Anal Fissure

Symptoms

Fissures produce a distinctive pattern of symptoms that usually allow a confident clinical diagnosis. Common presentations include:

Intense Sharp Pain

Described as passing glass, the pain occurs during a bowel movement and may persist for minutes to hours afterwards.

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Bright Red Bleeding

Small amounts of fresh blood on toilet tissue or on the surface of the stool. Never altered or dark blood.

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Visible Tear or Sentinel Pile

A small crack visible at the anal margin, or a skin tag (sentinel pile) that develops at the lower end of a chronic fissure.

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Avoidance of Bowel Movements

Anticipatory pain leads patients to delay defaecation, which worsens constipation and prolongs the fissure cycle.

⚕ Clinical Note

Fissures are frequently misdiagnosed as haemorrhoids. Persistent anal pain, particularly pain that continues after a bowel movement, should always be assessed by a specialist to confirm the correct diagnosis and exclude other pathology.

— Why They Occur

Causes & Risk Factors

Anal fissures result from trauma to the anal canal mucosa, combined with reduced blood supply to the posterior midline, which impairs healing. Common causes include:

1

Constipation and Hard Stools

Straining and passage of large, firm stools is the most common cause. The mechanical shearing force tears the delicate anal lining.

2

Persistent Diarrhoea or Straining

Repeated passage of loose stool is an underrecognised cause, particularly in patients with inflammatory bowel disease.

3

Childbirth

Anterior fissures are more common in women and are strongly associated with vaginal delivery and obstetric trauma.

4

Underlying Conditions

Crohn's disease and inflammatory bowel disease (IBD) can predispose to atypical, multiple or lateral fissures that are more difficult to treat.

— The Consultation Process

Diagnosis & Investigation

Early intervention is key to preventing an acute fissure from becoming chronic. I use a gentle approach to assessment, ensuring your comfort at every step.

1

Physical Examination

Most fissures are diagnosed by a careful visual inspection of the anal margin. Gently parting the skin is usually sufficient to identify the tear, a sentinel pile or any associated skin changes. An internal examination is deferred if too painful at the first visit.

2

Ruling Out Other Pathology

To ensure the fissure is not a symptom of a deeper issue, such as polyps, IBD or malignancy, I may recommend a Flexible Sigmoidoscopy or Colonoscopy. These are arranged as a separate, scheduled procedure to fully evaluate the bowel.

— Management Pathway

Treatment Options

I follow a step-up approach to treatment, beginning with the least invasive options and reserving surgery only for complex or refractory cases.

1

Non-Surgical Treatment

First-line · Most fissures heal with these measures alone

The majority of acute fissures respond well to conservative management. The goal is to relax the sphincter, improve blood flow to the area, and prevent further trauma from hard stools.

  • Medicated Creams Specialised topical ointments to relax the internal anal sphincter and improve blood flow to promote healing. Applied directly to the fissure twice daily for 6 to 8 weeks.
  • Stool Softening A high-fibre diet, adequate hydration and laxatives where needed to ensure stools are soft and easy to pass, preventing further trauma to the healing tissue.
  • Warm Sitz Baths Soaking in warm water for 10 to 15 minutes after each bowel movement helps relax the sphincter and ease discomfort during the healing period.
  • Topical Anaesthetic A local anaesthetic gel applied before a bowel movement can significantly reduce pain and break the cycle of avoidance that prolongs the fissure.
Most acute fissures heal within 4 to 8 weeks of consistent non-surgical management. Patients are reviewed to confirm healing and ensure no further investigation is needed.
2

Botulinum Toxin (Botox) Injection

For chronic fissures failing conservative treatment

For fissures that have failed to heal after 6 to 8 weeks of topical treatment, a Botox injection into the internal anal sphincter is a highly effective, well-tolerated option.

  • How it Works Botulinum toxin temporarily relaxes the internal anal sphincter, reducing spasm and improving blood flow to the fissure, allowing the tissue to heal naturally over 2 to 3 months.
  • The Procedure Performed as a day case under local or general anaesthetic. Takes only a few minutes and recovery is quick, with most patients returning to normal activities within a day or two.
  • Effectiveness Heals chronic fissures in approximately 60 to 80% of cases. Can be repeated if the initial injection provides partial but incomplete healing.
Botox injection avoids the small but permanent incontinence risk associated with surgical sphincterotomy and is my preferred second-line treatment for chronic fissures.
3

Surgical Repair (Sphincterotomy)

Reserved for selected cases where all other treatments have failed

Lateral internal sphincterotomy is the most effective treatment for chronic fissures, with healing rates exceeding 95%. It is reserved for cases where non-surgical and Botox treatments have not achieved healing.

  • The Procedure A small portion of the internal anal sphincter muscle is divided to relieve the spasm and restore blood flow. Performed as a day case under general anaesthetic.
  • Recovery Most patients return to normal activities within 1 to 2 weeks. Fissure healing is typically complete within 4 to 8 weeks of surgery.
  • Important Note on Risk Surgery involves a permanent change to the sphincter muscle and carries a small risk of affecting bowel control (incontinence to wind or, rarely, stool). A thorough risk-benefit discussion is conducted with every patient before proceeding.
Surgery is highly effective but is always the last resort. A careful, individualised assessment ensures that only patients who are likely to benefit proceed to this option.

— Why Choose Specialist Care?

The Importance of Expert Assessment

A fissure that is incorrectly managed or left untreated can become a chronic, debilitating condition. Specialist assessment ensures the correct diagnosis, rules out underlying pathology and delivers a treatment plan tailored to your individual circumstances.

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Accurate Diagnosis

Proper examination to exclude other causes of bleeding and rectal symptoms, including bowel cancer screening where appropriate.

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Tailored Treatment

A management plan specific to your grade of haemorrhoid, symptoms and lifestyle, not a one-size-fits-all approach.

Prompt Access

Most patients are seen within days. Clinic-based procedures can often be performed at the same appointment.

Do Not Live with Persistent Pain

Expert management can resolve most anal fissures without surgery.
Book a consultation with Mr. Lalit Kumar today.

Anal Fissure Anatomy

Quick Facts

Acute fissure healing

~80%

Botox success rate

60–80%

Surgical cure rate

>95%

Recovery after surgery

1–2 wks

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Specialist opinion when it matters

Appointments typically within 3–5 working days.