There are many reasons for the painful sensation above the anus: first, if the patient exists anal fissure, anal fissure is due to long-term defecation dry, easy to make the perianal skin fissures, which will produce perianal pain sensation, generally pain is cyclical, perianal visual examination can be seen perianal can have trauma. Second, if the patient has anal sinusitis, long-term diarrhea can easily make the anal glands infected and thus inflammation of the anal sinus, which generally manifests as anal and rectal swelling and discomfort, pain can be felt at the anal canal, and sometimes purulent secretions can be palpated on rectal finger diagnosis. Third, if the patient has a rectal submucosal abscess, sometimes it will spread around along the anal canal, and there will also be the feeling of anal and rectal swelling and discomfort. So there are many causes of pain on the anus, which should be combined with medical history rectal diagnosis, and if necessary, perianal ultrasound can be performed to clarify the diagnosis.