Anal itching is a common pruritus, mostly in middle-aged and elderly people and those who do not exercise regularly. There are many causes of anal itching, as follows. 1, the liver is not cleaned up After going to the toilet, the liver is not cleaned up, and the fecal residue will stimulate the skin of the liver causing inflammation, which leads to anal itching. 2, pants too tight, anal area is not easy to disperse sweat Wearing outer pants and underwear that are not easy to disperse sweat or too tight will make it difficult to disperse sweat from the buttocks, and it will rub the anal skin and induce anal itching. 3, allergy itching consume chili, wine, mustard, garlic and onion such irritating food, or take antibiotics and other drugs that cause allergies, causing anal itching. 4.Anal fissure The main symptom of anal fissure is periodic pain, accompanied by constipation, blood in the stool and other symptoms. As for the anal itching is because the anal fissure ulcers after the secretions, stimulating the anus. 5, perianal eczema Perianal eczema is a common skin sex, is not contagious. Suffering from this disease, the skin around the anus will become rough, gray or dark red, and even rash, red spots, erosion, crusting and flaking symptoms. Itchiness and recurrent attacks when it is the main hot spot. 6, neurodermatitis Yes, the anus can also suffer from neurodermatitis. If you scratch often, the skin will be mossy, small granular papules dense in patches, in the surface will also be attached to a small amount of white flakes. The itching is unbearable, especially at night, itching is even worse, serious people will affect sleep. 7, hemorrhoids Blood in the stool is the main symptom of hemorrhoids, may also be accompanied by pain, hemorrhoids allowed to develop to a certain stage, it may secrete mucous material to stimulate the anus, which in turn leads to anal itching.