Itching inside the anus may be caused by physiological reasons, physical diseases and psychological diseases. 1. Physiological reasons: some patients do not love cleanliness, it is easy to lead to local breeding bacteria, when the bacteria continue to grow to stimulate the anus around the anus, it will show the itchy inside the anus. Patients should pay attention to anal hygiene, clean, change underwear can be effectively improved. 2. Physical diseases: such as clinical common internal hemorrhoids, anal fissure, anal warts, perianal abscess and other related diseases can induce the symptoms of itching inside the anus. It is recommended that patients go to the hospital in time for relevant examinations, clear reasons, and then symptomatic treatment. 3. Psychological disease: If the patient suffers from depression, dysthymia and other related diseases will interfere with the patient’s nervous system, thus inducing nerve dysfunction. At this time, the patient is very easy to show the inside of the anus itching and emotional instability and other symptoms. When the patient is clear that the inside of the anus itchy, should go to the hospital in a timely manner, as soon as possible to find the problem, as soon as possible to give treatment.