The skin is always itchy to consider may be caused by physiological factors, such as environmental dryness; may also be caused by pathological factors, such as eczema, mite dermatitis and so on. 1. Physiological factors: drinking too little water or a dry environment, it is easy to lead to damage to the skin barrier, triggering the skin flaking, dry and itchy situation. 2. Pathologic factors: (1) eczema: a chronic inflammatory disease of the skin caused by multiple factors, which may be related to heredity, mental stress, infection and other factors, manifesting itself as local skin manifestations of erythema, papules, papules, and itching symptoms. (2) mite dermatitis: in daily life, air conditioners, sofas, bed sheets, towels, pillows, clothes and other places have mites, mites bite the skin to produce an allergic reaction, triggering itchy skin symptoms. Patients should usually pay attention to drink more water, give the body enough water, and pay attention to skin cleaning. If the patient’s itchy skin symptoms are not effectively relieved for a long time, it is recommended to go to the hospital to clarify the cause of the disease, and do the appropriate treatment under the advice of the doctor.