There are many reasons for perianal itching, which may be related to the following factors: 1. Feces. Feces if splashed to the perianal skin, local stimulation can cause perianal itching. Generally in the older, lower resistance, low nutritional status, anal sphincter relaxation, fecal incontinence patients, easy to make feces, mucus splash to the perianal skin. 2, a large amount of alcohol or diet spicy stimulating food, sometimes also cause discomfort in the anus, causing itching. 3, itchy perianal area, it may be the contact with the animal chemicals, usually paint the wall with the paint, some man-made fibers, fabrics. There are dietary seafood, can cause anal itching. 4, there is a more common reason, is in the state of mental tension, anxiety, easy to cause anal itching. If the anal itching is serious, also often lead to anxiety, poor sleep and other mental symptoms. Therefore, the reasons for itching around the anus are particularly numerous.