Anal itch is not necessarily a harbinger of disease, may be hygiene cleaning is not in place caused by physiological skin itching, but if there is persistent anal itching, it is considered that may be hemorrhoids, anal fissure or anal fistula and other diseases caused by the specifics of the need to go to the hospital for examination. 1. hemorrhoids: hemorrhoids is due to the venous plexus of the anal canal or lower rectum congestion or bruising caused by the enlargement, part of the hemorrhoids patients do not have obvious self-conscious symptoms, symptomatic patients are usually manifested as anal bleeding, pain, and perianal itching, and so on. 2. anal fissure: anal fissure is generally due to the anal canal skin rupture or tear caused by the anal fissure patient’s main symptoms of anal pain and blood in the stool, chronic anal fissure patients due to anal fissure of the ulcerated surface and subcutaneous fistulae secretion will be the anal edge of the skin to produce stimulation, so there will also be itchy anus. 3. anal fistula: anal fistula is mainly anorectal abscess broken or incision drainage left behind after the lesions, mainly manifested in the anal fistula or intermittent outflow of a small amount of pus, blood or mucus secretion, when the secretion stimulates the perianal skin time will cause itching. Causes of anal itch more reasons, in addition to the above diseases, there may be its causes, if the patient persistent discomfort, it is recommended that timely to the hospital for examination and diagnosis, clear causes under the guidance of a professional doctor, combined with the personal situation of targeted treatment, to avoid misunderstanding the condition, resulting in adverse effects.