I. Introduction to anal pruritus Anal pruritus is a common localized pruritus. Sometimes there is a slight itching in the anal region, but if the itching is severe and persists for a long time, it becomes pruritus. It is a common limited neurological dermatosis. It is usually limited to the perianal area, and some may spread to the perineum, vulva or the back of the scrotum. It occurs mostly in the middle and old age of 20 to 40 years old, less frequently in young people under 20 years old, and rarely in children. It is more common in men than in women, and this pruritus occurs more often in people who are used to quiet and infrequent exercise. Secondary pruritus has obvious causative factors, easy to treat; spontaneous or unknown causes of PA is not easy to cure, but also often relapses, accounting for about 50% of all patients. Second, the classification of anal pruritus 1, psychogenic pruritus Pruritus symptoms can be in the whole body, but also in the anal local, local more than no obvious scratch, generally more exaggerated degree of itching, these patients are accompanied by psychiatric symptoms. 2, elderly pruritus Mostly seen in the elderly, itching to the trunk extremities mainly, can also spread to the anus, long-term scratching can occur eczema-like changes, related to the dry skin of old age. 3, liver, kidney disease, that is, due to liver and gallbladder disease, such as biliary infarction or hepatitis, taking drugs to hurt the liver, thus making the liver bile depression, overflowing in the blood, bile salts in the blood rise, accumulate in the skin, stimulating the skin sensory apparatus, resulting in itching. Kidney dysfunction, which also leads to itching, can have a generalized body. 4, secondary pruritus mainly secondary to hemorrhoids, fistula, anal fissure, anal eczema, neurodermatitis, pinworm disease and other conditions. 5, endocrine pruritus Diabetic pruritus can spread to the whole body and perineum and anus, which is caused by the elevated sugar content of the skin and stimulation of peripheral nerves. Hyperthyroidism can also occur in patients with pruritus, and mental tension, sweating, increased basal metabolism. Third, the prevention of anal itching 1, diet to pay attention to: avoid eating some spicy and other greasy food, to the summer, do not be too greedy for cold, should not eat more too cold food. And summer due to high temperatures, food left for a long time, easy to deteriorate, in the consumption must be careful. Usually eat more vegetables, fruits, staple food to light, conducive to intestinal tract smooth, smooth bowel movements. 2, personal hygiene to pay attention to: summer sweat secretions are more vigorous, you need to wash the anal area every day, to keep the local clean, dry, to avoid infection at the anus, leading to inflammation. 3, defecation habits to pay attention to: do not squat in the toilet for a long time, should grasp the time, at most not more than 10 minutes or so, to develop good habits of regular defecation, so that the intestines can peristaltic normal. 4, work and rest: the pressure of work, study pressure, nerves in long-term tension, anxiety, the nervous system of the brain is easily stimulated, the formation of reflex itching. In the rest time should go out to do some outdoor sports, work and rest, enhance resistance at the same time, can also make the mood happy, reduce stress. If you suffer from anal itching, please go to the hospital for diagnosis and treatment in time to avoid delaying the disease.