Anorectal diseases generally require anal local examination, anorectal digital examination and anoscopy. According to the need, some cases need further stool routine, fecal occult blood, endoscopic examination (including sigmoidoscopy, fiber colonoscopy, electronic colonoscopy, ultrasonic colonoscopy), pathology, defecation radiography, intra-rectal B-ultrasound, anorectal pressure measurement, and rectal sensation measurement.