It is well known that the anal region is rich in nerves and sensitive to sensation, and any stimulation can lead to anal pain. The pain can be manifested as stabbing pain, swelling pain, burning pain, cramping pain, etc. The pain can occur during, after, or not related to defecation. From the clinical point of view, the causes of pain are mainly the following: 1, inflammatory pain: all perianal inflammatory diseases such as anal sinusitis, anal papillitis, inflammation of external hemorrhoids, perianal infection, perianal abscess, anal fistula infection and other inflammatory stimuli can lead to anal pain or severe pain, individual cases of pain will be accompanied by a series of symptoms such as general fever, dry stool, difficult to urinate, and of course, accompanied by an increase in the total number of white blood cells. 2, spasmodic pain: anal fissure or edema of hemorrhoids, internal hemorrhoids embedded, etc. often produce anal pain due to spasm of the anal sphincter. 3, anorectal injury pain: such as foreign body damage to the anus, anal lacerations, tailbone injuries, surgical trauma, etc. can cause different degrees of anal pain. If over-eating spicy, strong wine, stool containing irritating ingredients will also make anal pain and discomfort. 4.Pressure pain in the anus and surrounding tissues: such as late anal canal cancer, low rectal cancer, prostate cancer, cervical cancer, etc. will be accompanied by anal pain and obvious bowel discomfort. 5.Anal neurosis due to excessive tension: the most typical characteristics of such patients are pain, ringing, foreign body, numbness and uncleanliness in the anus, accompanied by mental depression, loss of appetite, dizziness and insomnia, which are all mental problems and often require psychological treatment. The anal nerve factor is mainly caused by compression of the perianal nerve with the surgical scar, such as various postoperative scar stenosis of hemorrhoids, postoperative scar malabsorption, scar physique, etc. can lead to pain due to compression. 6, rectal pressure increase pain: such as bacterial dysentery, proctitis attack period, fecal impaction, etc. can cause anal pain due to high rectal pressure stimulation rectal end pressure receptors. We can have a general understanding of the time of pain, the nature of pain, and the degree of pain to help ourselves have a preliminary understanding. Generally, inflammatory pain such as external hemorrhoid inflammation, perianal infection, perianal abscess, etc. is persistent, not related to defecation, and can affect sleep; if the pain is during and several hours after defecation, with obvious intermittency, it is mostly caused by anal fissure; if the anal pain is persistent, accompanied by purulent discharge, or difficult to relieve stool, and wasting, the possibility of rectal tumor should be considered; if the pain is related to weather drastic changes, it may be scar pain. . From the nature of pain, anal fissure pain has stabbing pain and cutting pain; if it is perianal infection or abscess formation it is manifested as perianal burning pain and jumping pain when pus is formed. In terms of the degree of pain, infectious diseases such as perianal abscess, due to the high perianal tension and toxin stimulation of nerves, can manifest as severe pain, which cannot be relieved by sitting in the bath; if due to anal sphincter spasm can manifest as anal convulsion-like pain, which can be relieved by sitting in the bath; if it is inflammatory external hemorrhoids, anal papillitis, etc., the pain is significantly less than the above two kinds of pain. In short, no matter which kind of pain occurs in patients should pay great attention to it and seek medical attention in time to prevent the disease from worsening or deteriorating.