There are many reasons for itchy buttocks, common anal eczema, hemorrhoids, dermatitis, mental factors, psychological factors, as follows: First, the most common is hemorrhoids, hemorrhoids protrude, there is mucus secretion outflow, stimulation of the anus and the surrounding skin caused by itching. Therefore, patients suffering from hemorrhoids should move frequently, avoid sitting and standing for a long time. After defecation with warm water sitz bath, keep clean and dry around the anus, can avoid itching, if necessary, the use of drugs. Secondly, anal eczema is non-contagious, perianal skin diseases mainly manifested as itching of the skin in the anal area, there are many forms of skin damage, manifested as papules, oozing, erythema, erosion and so on. Patients usually pay attention to personal hygiene, do not eat spicy, stimulating food, pay attention to underwear, underwear clean and clean. Third, dietary factors, such as chili, mustard, pepper, spices, coffee, etc., can cause irritation of the anal canal and the surrounding skin, inducing itching. So, try to avoid these foods. Fourth, if only itchy buttocks, there is no other abnormal feeling, may also be caused by dermatitis. The specific situation should go to the hospital, after the doctor special examination to give specific diagnosis and treatment plan.