Definition | Causes | Risk Factors | Symptoms | Diagnosis | Treatment | Prevention

Definition

An anal fissure is a painful cut in the lining of the anus. The anus is the opening through which stool leaves the body. Tears generally occur just inside the opening.

Anal Fissure

Nucleus factsheet image
Copyright © Nucleus Medical Media, Inc.

Causes

A large, dry, or hard stool can tear the lining of the anus. Frequent diarrhea or irritation of the anus and rectum may also lead to a tear.

Risk Factors

A risk factor is something that increases your chance of getting a disease or condition.

Risk factors for an anal fissure:

  • Constipation
  • Straining to pass a bowel movement
  • Prior anal surgery, which can cause scarring and decrease the tissue's elasticity
  • Chronic diarrhea

Symptoms

Symptoms of an anal fissure are similar to those of other more serious conditions. Therefore, you should see a doctor if you have these symptoms:

Diagnosis

The doctor will ask about your symptoms and medical history. He or she will also do a physical exam. The anal area will be examined, which involves the following:

  • The doctor will hold the buttocks apart. This will usually turn the anus outward enough for tears to become visible.
  • If fissures have persisted for three months or more, additional changes may be seen. These changes may include a sentinel tag or "pile," granulation tissue, or white discoloration from scar tissue around the fissure.
  • If pain permits, the doctor may perform:
    • Digital rectal exam—Doctor inserts a lubricated finger into the anus and feels for lumps or abnormalities
    • Anoscopy—A tool is inserted into the anus to allow the doctor to examine the anal canal

      • Note: Patients often cannot tolerate these additional exams without anesthesia until after the fissure has healed.

Fissures usually occur in predictable locations around the anus. If there are multiple cuts, or a cut in an unusual location, the doctor may order additional tests to look for other conditions.

Treatment

Treatment aims to heal the cut and prevent future anal problems. About half of all fissures heal on their own or with self-care. Fissures that are fairly new are easier to heal than ones that have persisted for longer than three months.

Treatments include:

To promote healing:

  • Avoid hard, dry stools:
    • Drink at least eight 8-oz (ounce) glasses of water per day.
    • Eat more fiber—Strive for 20-35 grams per day.
    • Take stool softeners or bulk laxatives as directed by your doctor.
  • Exercise regularly.
  • Apply a medicated cream or ointment as directed by your doctor.
  • Use sitz bath. Soak the anal area in warm tap water for 10-20 minutes several times daily, especially after a bowel movement. This helps to relieve pain and promote blood circulation.

Some fissures may need surgery. Fissures may not heal by themselves, or you may have repeated ones. Scar tissue or spasms in the sphincter muscle, which closes and opens the anus, may also delay healing.

There are several surgical options. The most common surgery is called lateral internal sphincterotomy. During this procedure, the doctor will make a tiny incision and divide certain fibers of the sphincter muscle. This will prevent the muscle spasms that lead to straining with a bowel movement.

If you are diagnosed with an anal fissure, follow your doctor's instructions.

Prevention

Most fissures are caused by hard, dry stool that is associated with constipation. To avoid becoming constipated: