1.External hemorrhoid edema is mainly swelling and burning pain, manifested as a restricted lump at the edge of the anus, hard, smooth, crystal clear, and obvious pain to touch. It is mostly caused by straining, struggling during stool or surgical stimulation. 2.In the early stage of rectal cancer, there is no pain, but later on, due to the enlargement and rupture of the mass, there may be swelling and hidden pain in the anus, and there are common symptoms such as change of stool habit, pus and blood stool, abdominal distension, abdominal pain and weight loss. If patients have the above mentioned symptoms, they should ask the specialist for diagnosis and treatment in time. Liu Haiyi, Department of Anorectal Medicine, Shanxi Cancer Hospital 3.Anal foreign body injury is mostly caused by traumatic foreign body residue or improper diet, fish spur, bone fragment embedded in the rectum of the anal canal, so it is necessary to ask the doctor to examine carefully and remove the foreign body, the pain can be relieved. If the retention time is too long, it can cause local infection. 4, anorectal neurosis pubic neurological syndrome, rectal inflammation, etc. can cause anorectal pain, often need to pay attention to the clinical, to distinguish.