Non surgical therapy for anal fissure. How can an anal fissure be prevented? Anal fissures may cause sharp pain and small amounts of bright red blood with bowel movements. In most cases, the tear heals on its own within four to six weeks. Check here for alerts.
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Wald A, et al. An anal fissure most often occurs when passing large or hard stools. An anal fissure may occur when you pass hard or large stools during a bowel movement. Anal fissures typically cause pain and bleeding with bowel movements. Chronic constipation or frequent diarrhea can also tear the skin around your anus. Skip to main content. What is an anal fissure?