Anal Fissure

Definition

An anal fissure is a cut or tear 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
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Causes

The exact cause of an anal fissure is unknown. In most cases, tearing is the result of trauma to the anal lining. Trauma can be caused by:
  • A large, dry, or hard stool
  • Frequent diarrhea
  • Tightened anal sphincter, a group of muscles that open and close the anus
  • Childbirth
  • Anal irritation

Risk Factors

Factors that may increase your chance an anal fissure include:

Symptoms

Anal fissure may cause:
  • Pain during and after a bowel movement
  • Burning sensation during a bowel movement
  • Bleeding with bowel movements that result in bright red blood either on the toilet tissue or in the bowl
  • Small amounts of mucous may be present
Apprehension about bowel movement pain may cause you to delay bowel movements. This can make the symptom worse.

Diagnosis

The doctor will ask about your symptoms and medical history. A physical exam will be done. Anal fissures are generally visible, so diagnosis can be made with an anal exam. If it is not visible, but suspected, your doctor may need to do other tests as long as it is not too painful. These tests include:
  • Digital rectal exam—to feel for any lumps or abnormalities
  • Anoscopy—examination of the anal canal with a scope
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.

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