Anal pain need to consider thrombosed external hemorrhoids, anal fissure, perianal abscess, anal fistula, etc.. 1. thrombosed external hemorrhoids, due to the blood vessels of the external hemorrhoids are squeezed, the formation of thrombus, pressure increases, local severe pain, swelling around. 2. Anal fissure, long-term constipation, dry stool damage to the perianal skin, mucous membrane, anal pain during defecation, followed by anal sphincter spasm again severe pain. 3. Perianal abscess, acute purulent infection around the rectum and anal canal, localized redness and pain, gradually forming abscesses, need anti-infection, surgical treatment. 4. anal fistula, most secondary to perianal abscess, abscess rupture, the formation of anal fistula, anal fistula around the obvious pain, pus overflow from the external mouth, recurrent episodes and other phenomena. 5. Trauma, if the perianal area is hit, extrusion and other trauma, can also cause pain, most of the local redness, swelling, bruising and so on. Anal pain, first need to go to the hospital, check the specific causes, clear causes and then targeted treatment to avoid delay.