The itchy condition may be caused by dry skin, skin allergies, rashes, and internal diseases. 1. Dry skin: when the patient is in the period of seasonal change, or in a dry environment, it may lead to the loss of skin moisture, resulting in dry skin, which may appear all over the body itchy situation. 2. Skin allergy: after contact with dust mites, pollen, animal hair and other allergies, patients may cause allergic reactions and itching. 3. Skin rashes: when patients have dermatitis, eczema, urticaria, drug rash and other skin diseases, it may also cause itching all over the body. 4. Internal diseases: when patients with thyroid function abnormalities, diabetes, biliary cirrhosis, renal insufficiency, uremia and other internal diseases, may also cause itching. It is recommended that patients usually change clothes and bed sheets diligently, do not overheat the bath water, use mild, non-irritating bathing supplies, and can go to a regular hospital for diagnosis and treatment.