Itchy body but nothing, usually caused by pruritus. Pruritus is a skin disease that only has itchy skin without primary lesions, the cause is more complex, and may be related to dry skin, local sweating, external stimulation, mental factors, disease factors, etc.: 1, dry skin: patients usually do not pay attention to skin care, coupled with the dry climate, may also be due to the decline in the function of the sebaceous glands in the elderly, resulting in skin dehydration, and thus the symptoms of itching; 2, local sweating. As the weather is hotter in summer, the skin is prone to sweating, which can induce or aggravate itching; 3, external stimulation: clothing friction, the use of alkaline soap and water and cleaning skin care products, etc., may cause itching; 4, mental factors: emotional tension, anxiety, fear, excitement or depression and other mental factors, may also lead to itching; 5, disease factors: local diseases are mainly parasitic infections, such as scabies . Systemic diseases are mainly uremia, obstructive hepatobiliary disease, diabetes mellitus, dry syndrome, etc. Pruritus patients need to clarify the presence of disease factors, and timely treatment, avoid local scratching, washing and scalding and inappropriate treatment, avoid eating irritating food, common treatment methods are as follows: 1, topical drug therapy: moisturizing, moisturizing, antipruritic, choose a less irritating topical preparations, available low pH cleansers and anti-pruritic agents, such as stove glycolic lotion; 2, oral drug therapy: available antihistamines, calcium Vitamin C, sedative and sleeping drugs, etc., elderly pruritus can be combined with the use of sex hormones; 3, physical therapy: phototherapy is effective for some pruritus, dry skin can be combined with fumigation treatment, in addition, starch bath, mineral bath have certain curative effect.