Miss Patricia Boorman

Consultant Colorectal Surgeon


Anal Fissures

An anal fissure is a small tear in the thin, moist tissue (mucosa) that lines the anus. An anal fissure may occur when you pass hard or large stools during a bowel movement.

Anal fissures typically cause pain and bleeding with bowel movements.

What is an anal fissure?

An anal fissure is a tear or an open sore in the lining of your anal canal. The most common symptoms of an anal fissure include a sharp pain in your bottom when opening your bowels.

This may also be accompanied by some bright red blood that you notice on the toilet paper upon wiping or notice in the toilet bowl.

Anal fissures are usually caused by the tearing of the lining of your anal canal when passing a hard or large stool.

The most common treatment for anal fissures is an examination under anaesthesia (EUA) and Injection of Botulinum Toxin A (Botox or Dysport).

What are the symptoms of an anal fissure?

The typical symptoms of an anal fissure include severe pain during, and especially after, a bowel movement, lasting from several minutes to a few hours. Patients may also notice bright red blood from the anus that can be seen on the toilet paper or on the stool.

Between bowel movements, patients with anal fissures are often relatively symptom-free. Many patients are fearful of having a bowel movement and may try to avoid defecation secondary to the pain.

Did you know?

That anal fissures occur in people of all ages and health backgrounds? Fortunately, most of them heal on their own in one to two months without the need for medical intervention. If you have an anal fissure, see a colorectal doctor for a consultation to determine what treatment may be necessary.

What causes an anal fissure?

Fissures are usually caused by trauma to the inner lining of the anus. Patients with tight anal sphincter muscles (i.e., increased muscle tone) are more prone to developing anal fissures. A hard, dry bowel movement is typically responsible, but loose stools and diarrhoea can also lead to a fissure.

Following a bowel movement, severe anal pain can produce spasm of the anal sphincter muscle, resulting in a decrease in blood flow to the site of the injury, thus impairing healing of the wound. The next bowel movement results in more pain, anal spasm and further reductions in blood flow and the cycle continues.

Treatments are aimed at interrupting this cycle by relaxing the anal sphincter muscle to promote healing of the fissure.

Anal fissures may be acute (recent onset) or chronic (present for a long period of time). Chronic fissures may be more difficult to treat, and may also have an external lump associated with the tear, called a sentinel pile or skin tag, as well as extra tissue just inside the anal canal (hypertrophied papilla).

What is the treatment of an anal fissure?

The majority of anal fissures do not require surgery. The most common treatment for an acute fissure consists of making the stool more formed and bulky with a diet high in fibre.

Stool softeners and increasing water intake may be necessary to promote soft bowel movements and aid in the healing process. Topical anaesthetics for pain may help the healing process.

Other medications (such as GTN, nifedipine, or diltiazem) may be prescribed that allow relaxation of the anal sphincter muscles. Narcotic pain medications are not recommended for anal fissures, as they promote constipation. Chronic fissures are generally more difficult to treat, and your surgeon may advise surgical treatment.

Will the problem return?

Fissures can recur easily, and it is quite common for a fully healed fissure to recur after a hard bowel movement or other trauma. Even when the pain and bleeding have subsided, it is very important to continue good bowel habits and a diet high in fibre as a lifestyle change. If the problem returns without an obvious cause, further assessment is warranted.

What can be done if the fissure does not heal?

A fissure that fails to respond to conservative measures should be re-examined. Persistent hard or loose bowel movements, scarring, or spasm of the internal anal muscle all contribute to delayed healing. Other medical problems such as inflammatory bowel disease (Crohn’s disease), infections, or anal tumors can cause symptoms similar to anal fissures. Patients suffering from persistent anal pain should be examined to exclude these symptoms. This may include a colonoscopy or an exam in the operating room under anaesthesia.

What does surgery involve?

Surgical options for treating anal fissure include Botulinum toxin (Botox®) injection into the anal sphincter and surgical division of a portion of the internal anal sphincter (lateral internal sphincterotomy). Both of these are performed typically as outpatient, day case procedures.

The goal of these surgical options is to promote relaxation of the anal sphincter, thereby decreasing anal pain and spasm, allowing the fissure to heal.

Botox® injection results in healing in 50-80% of patients, while sphincterotomy is reported to be over 90% successful. If a sentinel pile is present, it may be removed to promote healing of the fissure. All surgical procedures carry some risk, and a sphincterotomy can rarely interfere with one’s ability to control gas and stool. Your colorectal surgeon will discuss these risks with you to determine the appropriate treatment for your particular situation.

How long is the recovery after surgery?

Complete recovery usually take up to 10 weeks. However, acute pain after surgery often disappears after a few days. Most patients will be able to return to work and resume daily activities in a few short days after the surgery.

Book a consultation with Miss Boorman today.