Rectal fingerprinting can help to diagnose lesions of the anal canal and lower rectum, prostate diseases, occult pelvic fracture, and so on. 1. Diseases of anal canal and lower rectum: it can clarify whether there is perforation, prolapse, mass, polyp, cancer, hemorrhoids, anal fistula, perianal abscess, etc. of rectum. 2. Prostate disease: the size and texture of the prostate gland can be examined for prostate hypertrophy, prostate inflammation and prostate tumor disease. 3. Hidden pelvic fracture: some patients with pelvic fracture may have sacrococcygeal pressure during rectal examination. If there is a need for rectal fingerprinting, it is recommended to consult a doctor for examination in time to avoid delaying the condition.