Anal fissures usually lead to constipation. Anal fissure generally refers to the rupture of the skin of the anal canal to form a longitudinal ulcerated surface, which usually manifests itself as painful defecation, bleeding and constipation. Patients with anal fissure will cause anal pain during defecation, and patients are often afraid of defecation, resulting in feces staying in the colon for a long time, and the water is absorbed again by the intestines thus leading to constipation. Constipation anal fissure disease, if relatively mild, can be adjusted through diet, such as eating more food rich in dietary fiber, such as fresh vegetables and fruits, coarse grains and so on. If necessary, you can take stool softening drugs to regulate, such as lactulose oral solution, etc., can increase the water content of feces, so that it becomes lubricated, can be reduced to a certain extent on the anus of the pressure and stimulation. If there is anal fissure, constipation, etc., need to consult a doctor in time, and actively improve the treatment, such as the need for medication, need to follow the doctor’s instructions.