Itchy body may be due to decreased sebum secretion, may also be allergic dermatitis, or related to certain systemic diseases. 1. Decreased sebum secretion: dry environment, frequent bathing, or skin aging, will make sebum secretion decrease, no timely replenishment of water or do not pay attention to skin moisturizing, the skin becomes dry and flaky due to lack of water, which can be manifested as itchy skin without any rash. 2. Allergic dermatitis: usually associated with contact with certain allergens, resulting in skin metamorphosis, the main clinical manifestation of itchy skin, there may also be a rash, which allergens may be food, drugs, or close contact with the skin of certain chemical substances. 3. Certain systemic diseases: such as diabetes, tumors, renal insufficiency, liver function abnormalities, etc., will affect the level of hormone secretion, or cause the body metabolic toxins can not be discharged in a timely manner, thus causing itchy skin. Because of the causes of itchy body more, it is recommended that the patient to the regular hospital, clear cause, follow the doctor’s instructions for treatment.