When we collected questions from patients, we found that many of them were asking what anal pain was all about, and patients described the pain as different in nature, such as distension, cramping, burning pain, etc. This time we will discuss the anal pain, what are the possible causes, and what are the pain characteristics of this cause. Etiology and common diseases 1, anorectal and surrounding inflammatory stimulation anal sinusitis, anal papillitis, perianal abscess, anal fistula, inflammation of external hemorrhoids, ulcerative proctitis with rectal inflammatory exudate stimulation of the anus can also cause anal pain. 2.Anal rectal irritation Anal fissures, anal fissures, anal foreign body injury, spicy dietary stimulation, resulting in anal pain. 3, about muscle spasm Anal fissure, internal hemorrhoids embedded in the anal sphincter muscle spasm, causing anal pain. 4.Anal thrombosis External hemorrhoids, internal hemorrhoids prolapse accompanied by thrombosis, resulting in anal pain. 5.Anal and surrounding tissues compression Anal pain is caused by anal canal and rectal cancer, cervical cancer and prostate cancer when the anal canal and surrounding tissues are under pressure at an advanced stage. 6.Anal scar pain Anal and rectal scar contracture or inflammatory stimulation after various anorectal diseases, especially postoperative stenosis, can lead to anal pain. 7, mental and neurological factors Neurosis, pubic syndrome, etc. lead to anal pain. Examination 1.Visual examination Observe whether there is redness and swelling around the anus, whether there is thrombosis, whether there is ulcer, trauma, foreign body injury or swelling formation. 2.Finger diagnosis Check whether there is spasm or mass in the anus, whether there is swelling or pressure point in the rectum, whether there are hard nodes or depressions or stenosis and the site of stenosis. 3.Anoscopy Check whether the anus is congested and ulcerated, whether there is a swelling, and the shape of the swelling. Diagnosis 1.Pain site Anal fissure pain is mostly in the anterior and posterior position of the anal canal; external hemorrhoid thrombosis is mostly in both sides of the anus; pubic syndrome is mostly in the anorectal region, anterior pubic region and sacrococcygeal region; advanced rectal cancer invading the anus may have pain in the anorectal, anterior pubic and sacrococcygeal regions; neuropathic pain pain is indefinite. 2.Pain time Anal fissure, anal sinusitis, anal papillitis mostly during and after defecation. Perianal abscess, embedded internal hemorrhoids, thrombosed external hemorrhoids, inflammatory external hemorrhoids, advanced anorectal cancer, foreign body injury and postoperative pain are persistent; anal fissure is intermittent; neuropathic pain is indefinite; scar pain is mostly related to weather changes. The nature of pain is stabbing pain when fissure occurs and burning pain or cutting pain after fissure; burning pain in the early stage of perianal abscess and throbbing pain when pus is formed; cramping pain or jerking pain in the late stage of anorectal cancer; cramping pain in proctitis. 4.The degree of pain is severe for sphincter spasm and foreign body injury, and it is aggravated when defecating.