Because anal fissure is a kind of disease that is easy to recur, anal fissure bleeding again after a period of improvement is mainly seen in the recurrence of anal fissure. The reason for the formation of anal fissure is not clear, but a variety of factors can be related to it, such as long-term constipation, fecal dryness caused by the mechanical trauma that occurs during defecation is the direct cause of the formation of most anal fissure, in addition to diarrhea is also a common cause of anal fissure. The most common site of anal fissure is the posterior midline of the anus. Therefore, if the patient’s constipation, diarrhea symptoms frequent episodes, anal fissure is also prone to recurrence, or some patients will have chronic anal fissure, in some factors under the stimulation of the acute attack of anal fissure. Currently, the treatments for anal fissure include surgery, sitz bath, rest, etc. It is recommended to follow the doctor’s instructions as soon as possible to avoid bleeding and causing infections and other undesirable phenomena.