The reason why the body has been very itchy physiological and pathological, pathological causes such as eczema, cholestasis, diabetes, etc., need to be specifically analyzed. 1. Physiological factors: the elderly with age and the spring and autumn seasons, the skin is often in a dry state can cause skin itching, can be relieved by doing a good job of skin moisturizing, such as rubbing the body lotion and other ways. 2. Eczema: is caused by a variety of internal and external factors of the superficial dermis and epidermal inflammation, clinically acute lesions to herpes mound, with a tendency to ooze, the chronic phase to the moss-like changes in the main, easy to recur, can be self-conscious of intense itching. 3. Cholestasis: In patients with liver disease and cholestasis, itching is a common clinical manifestation. The exact substance that causes itching is not clear, it is thought to be caused by bile acids in the blood or skin, and it is necessary to actively treat the primary disease to relieve itching. 4. Diabetes mellitus: diabetes mellitus can also cause itchy skin, can be generalized all over the body, more confined to the perianal and genital areas. May be caused by neuropathy, candida infection, dry skin, need to control blood sugar and treatment of complications to relieve. The body has been very itchy may also have other reasons, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor standardized treatment.