The anal fissure triad is generally defined as the three of anal papilloma or anal papillitis, sentinel hemorrhoids, and old anal fissures or their resulting subcutaneous fistulas, which, in the case of anal fissures, would fall under the category of stage III anal fissures. Therefore, the anal fissure triad is a stage III anal fissure. Complications: 1, perianal abscess: perianal abscess disease in the disease period will appear anal pus phenomenon, and the pus is due to the rupture of the abscess, but after the rupture of the abscess site, due to the invasion of some bacteria lead to the fissure is difficult to heal, in the formation of infection and inflammation, thus forming the production of anal fissure disease. 2, anal fistula: anal fistula disease in the disease period its main symptom is anal pus, and long-term pus will lead to allergies in the anal area resulting in itching and pain in the anal area, the patient in the hand or other items to scratch the skin of the anal area, the bacteria in the pus into the wound, resulting in anal fissure. 3, hemorrhoids and polyps: these two diseases in the disease period will appear prolapse phenomenon, and repeated episodes of prolapse will directly lead to the anal area edema and abscess, in the edema and abscess rupture, thus forming the anal fissure disease. 4, constipation, dry stool: these two conditions are the main cause of anal fissures, when too dry stool discharge, will rub the anal area of the skin or tooth line, which leads to the production of anal fissures.