The anus is very painful to consider with hemorrhoids, anal fissure, perianal abscess and other diseases related. 1. hemorrhoids: when the prolapse of internal hemorrhoids and incarcerated, the prolapsed internal hemorrhoids due to the sphincter muscle clamping, the surrounding blood circulation is impaired, the internal hemorrhoids will be swollen and painful, causing anal pain. External hemorrhoids edema formation of thrombus or inflammation, there will also be swelling and pain. 2. Anal fissure: anal fissure usually leads to anal pain, which can be manifested as cut-like or tear-like pain, and usually causes severe pain during bowel movement, and may also cause blood in the stool. 3. Perianal abscess: perianal abscess can cause anal pain, due to abscess stimulation of the perianal area, usually more superficial perianal abscess, pain manifested as perianal throbbing pain, the location of the deeper perianal abscess, there will be persistent swelling and pain, and gradually aggravated, and may develop into a persistent throbbing pain. Anal pain may be caused by other diseases, such as anal cancer, rectal tumors, etc. If the symptoms of anal pain continue to be obvious, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to give diagnosis and treatment, to avoid delays in the condition caused by other damages.