Anal fissures are splits in the anal mucosa immediately within the anal verge.
Severe pain during defecation is common and the pain may persist for several hours. Bright red bleeding is also common. Most fissures can be seen on inspection and the severe anal spasm can be appreciated on attempted digital examination. More than 80 percent of acute anal fissures will heal spontaneously with the use of dietary fiber to soften and bulk the stool. Recurrent or chronic fissures also benefit from the use of warm baths and suppositories.