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. The symptoms of anal fissure triad have clear characteristics, and the diagnosis is not difficult with detailed interrogation of the history and course of the disease, as well as the pain and bleeding characteristics. However, in order to improve the accuracy of diagnosis and prevent errors, the differential diagnosis should be strictly based on examination, palpation, visual examination and histopathological biopsy. Examination: 1. Visual examination: acute anal fissures can be seen as secretions in the anus, and the lower end of the fissure can be seen by holding the buttocks open, which can cause pain if the lower end of the fissure is lightly touched with a probe; chronic anal fissures commonly have connective tissue external hemorrhoids. 2, finger diagnosis: due to sphincter muscle spasm anal tightening, such as excessive force, often cause severe pain, sometimes must be examined under local anesthesia. The fissures felt in the anus are soft at the edge, shallow at the bottom, elastic and sensitive to touch in acute cases; hard and raised at the edge, deep at the bottom and inelastic in chronic cases. 3. Speculum examination: oval ulcers can be seen, or small fissures can be seen. In acute anal fissures, the edge of the fissure is neat and the bottom is light red; in chronic fissures, the edge of the fissure is not neat and the bottom is dark gray-white, and in some severe fissures, the sphincter fibers can be seen.