Anal Fissures, sometimes called Fissure-in-Ano , are small tears in the lining of the anal canal. They are most commonly caused by constipation, diarrhea or trauma. They cause burning or sharp pain in the anal canal that is set off by bowel movements and usually lasts for several hours. Typically, bright red blood is present either on the stool or the toilet paper or in the bowl.

Most fissures will heal by themselves in 24-48 hours if bowel movements return to and remain normal.

The medical treatment of anal fissures includes fiber supplements, medicated suppositories and creams. If patients do not respond to medical treatment outpatient surgery is sometimes necessary.