Anal Fissures: Symptoms, Causes, and Effective Treatment in the UK

An anal fissure is a small tear or crack in the thin, moist tissue (mucosa) that lines the anus. This common condition can occur at any age but is most frequent in infants and middle-aged adults. In the UK, it is a frequent reason for patients to seek a GP consultation, often causing significant distress due to the level of pain involved.

Fissures are typically classified as either acute (present for less than six weeks) or chronic (lasting longer than six weeks). While they are benign, the symptoms can mimic more serious conditions, making it essential to understand the signs and when to seek professional medical advice.

Recognising the Signs

The hallmark of an anal fissure is pain during a bowel movement. Patients often describe the sensation as "passing shards of glass." The discomfort can vary from a mild sting to severe, debilitating pain that lasts for several hours after visiting the toilet.

• Sharp pain: Occurring specifically during the passage of stool.
• Burning or itching: A persistent discomfort in the anal region.
• Bright red blood: You may notice small amounts of fresh blood on the toilet paper or on the surface of the stool (not mixed in).
• Visible crack: A small tear may be visible in the skin around the anus.
• Skin tag: In chronic cases, a small lump of skin, known as a sentinel pile, may develop near the tear.

Most anal fissures are caused by trauma to the anal canal. According to NICE (National Institute for Health and Care Excellence) guidelines, the most common trigger is constipation and the straining associated with it.

Specific causes include:

• Constipation: Passing large, hard, or dry stools that stretch the anal lining beyond its limit.
• Persistent Diarrhoea: Frequent bowel movements can irritate and weaken the mucosa.
• Childbirth: The intense pressure during vaginal delivery can result in tearing.
• Inflammatory Bowel Disease (IBD): Conditions such as Crohn's disease can cause inflammation that makes the anal lining more fragile.
• Anal Intercourse: Physical trauma during sexual activity can lead to fissures if lubrication is insufficient.

In many cases, an acute fissure will heal on its own within four to eight weeks if you take steps to keep your stools soft. The NHS recommends the following conservative management strategies:

Increase Dietary Fibre

Aim for at least 30g of fibre a day. Include plenty of whole grains, fruits, vegetables, beans, and pulses. Fibre adds bulk to the stool and makes it softer and easier to pass.

Stay Hydrated

Drink plenty of fluids (water is best) to prevent the fibre from causing further constipation. Aim for 6 to 8 glasses a day.

Sitz Baths

Soaking the area in warm water for 10 to 15 minutes several times a day, especially after a bowel movement, can help relax the anal sphincter muscle and promote blood flow to the area, aiding the healing process.

Avoid Straining

Do not ignore the urge to go to the toilet, but avoid sitting for long periods or straining, as this increases pressure in the anal canal.

If lifestyle changes are not enough, or if the fissure is chronic, medical intervention may be necessary. A UK GP or online doctor can prescribe several targeted treatments:

• Stool Softeners: Bulk-forming laxatives like Fybogel (Ispaghula husk) or osmotic laxatives like Macrogol can help reduce straining.
• GTN Ointment (Glyceryl Trinitrate): Applied topically, this helps expand blood vessels and relax the anal sphincter, reducing pain and allowing the tear to heal.
• Diltiazem or Nifedipine Cream: These calcium channel blockers work similarly to GTN but often have fewer side effects, such as headaches.
• Topical Anaesthetics: Lidocaine gels can be used for short-term pain relief shortly before a bowel movement.

Many patients feel embarrassed to discuss anal health in person. Using an online doctor service in the UK provides a discreet, professional way to seek help. You should book a consultation if:

• Your symptoms do not improve after two weeks of home care.
• The pain is so severe it interferes with your daily activities.
• You have repeated episodes of anal fissures.
• You need a prescription for GTN or Diltiazem cream that isn't available over the counter.

A digital consultation allows you to describe your symptoms and medical history in detail. Based on your description, a clinician can provide a diagnosis, issue a private prescription, and recommend further specialist referral to a proctologist if the fissure is non-responsive to topical treatments.