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an anal fissure (see the images below) is a painful linear tear or crack in the distal anal canal, which, in the short term, usually involves only the epithelium and, in the long term, involves the full thickness of the anal mucosa. Anal fissures develop with equal frequency in both sexes they tend to occur in younger and middle-aged persons. An anal fissure is a small tear or crack in the lining of the anus. If you experience severe pain or bright red bleeding during or after bowel movements, you may have an anal fissure. an anal fissure is a tear of the squamous epithelial mucosa of the anal canal, between the anocutaneous junction and the dentate line. Anal fissures are common in infancy, and they represent the most common cause of bright rectal bleeding at any age. Anal fissure is one of the most common benign anorectal diseases and one of the most common causes of anal pain and anal bleeding. The pathogenesis, clinical manifestations, diagnosis, and prevention of primary sporadic anal fissure are discussed in this topic, while the medical and surgical treatment is presented in other topics. (see anal fissure clinical manifestations, diagnosis, prevention, section on etiology. ) thus, finding of an anal fissure that is not at the midline should prompt an evaluation for crohn disease, although crohn-related fissures can also occur at the midline. Passage of a hard stool bolus may precipitate an anal fissure. However, only a minority of patients are constipated at the onset of symptoms. The fissure may begin during an episode of loose stool or often occurs spontaneously with no obvious precipitating factor. Anal fissure what is an anal fissure? An anal fissure is a tear in the lining of the anus or anal canal (the opening through which stool passes out of the body). Who is at risk for anal fissures? Anal fissures can occur in anyone at any age. The chance of having an anal fissure decreases as people get. An anal fissure (af) is a small break or tear in the skin of the anal canal, which typically runs from below the dentate line to the anal verge, and is usually situated in the posterior midline 1,2. Af causes severe pain and bleeding with bowel movements, and is associated with spasm of the internal anal sphincter which may lead to reduction of blood flow and delayed healing. the exact etiology of anal fissures is unknown, but the initiating factor is thought to be trauma from the passage of a particularly hard or painful bowel movement.