There is a thing next to the anus when you go to the toilet, mostly seen in hemorrhoids, perianal abscess and anal fistula. 1. hemorrhoids: is the anal canal or rectum under the venous congestion caused, can be divided into internal hemorrhoids, external hemorrhoids and mixed hemorrhoids three types. (1) Internal hemorrhoids: located above the dentate line, can be self-contained after prolapse, easy to bleed by rubbing. (2) External hemorrhoids: located below the dentate line, can not be retrieved after prolapse, not easy to bleed, mainly with the symptoms of pain and swelling. (3) mixed hemorrhoids: is the connection of internal hemorrhoids and external hemorrhoids, fused together hemorrhoids, often with pain, bleeding, swelling and other symptoms. (2) Perianal abscess: a suppurative mass formed by infection of the tissues around the anus or rectum, mainly with symptoms of pain and swelling. 3. Anal fistula: it is a lesion caused by abscess around the anal canal or rectum, and the main symptoms are self-flowing pus, discharge and pain. If the above situation occurs, it is recommended that the patient go to the hospital anorectal department in time to get a clear diagnosis, under the guidance of professional doctors, to give reasonable and standardized treatment.