Itchy buttocks refers to itching at the anal opening, which can be caused by hemorrhoids, but also by unclean perianal hygiene, rectal inflammation, and sexually transmitted diseases. Itching at the anal opening is more common in clinical practice and is considered to be related to hemorrhoids. For example, more serious hemorrhoids may lead to a protruding anal swelling. After defecation is not timely clean up, local fecal residue, the perianal skin caused by irritation, may lead to anal opening itching. In addition to this, usually do not pay attention to personal hygiene, fecal stimulation may cause itching; bacterial infection leads to inflammation of the rectal mucosa, the stimulation of inflammatory secretions, can also lead to perianal itching. If there are sexually transmitted diseases, such as syphilis, warts, etc., resulting in the local appearance of warts, may produce itching sensation. Intestinal parasites, and perianal eczema, are also major causes of localized itching. Once the symptoms of anal itching appear, it is recommended to go to a regular specialized hospital to identify the cause and then treat the symptoms.