The itchy side of the anus is a relatively common situation, mainly including the following causes: 1, the patient has anal skin disease and caused, mainly including anal eczema, neurodermatitis, venereal disease sweat glanditis, etc., these diseases stimulate the skin of the anus and cause itching. 2, anorectal diseases caused by itching, such as anal fissure, anal leakage, hemorrhoids and anal incontinence and other diseases, will make the anus 3, there may also be parasitic diseases, such as roundworms, vaginal trichomonas, scabies, etc., can cause the occurrence of itching. In addition to these three causes of anal itching, patients with endocrine diseases can also cause itching on the anal side.