Itchy skin in winter is mainly caused by physiological and pathological factors. Physiological factors such as age, bathing, climate, etc., and pathological factors such as ichthyosis, psoriasis, etc., nutritional deficiencies and thyroid diseases. 1. Physiological factors (1) Older age: For older patients, the sebaceous gland secretion function and water retention function will be reduced in winter, which will cause insufficient oil and water on the surface of the skin, and then itchy symptoms will appear. (2) Bathing factors: In winter, too frequent bathing, high bathing water temperature, frequent use of alkaline detergents, etc., can cause artificial degreasing and itching symptoms. (3) Dry climate: winter itself is cold and dry, because of excessive friction between the skin and clothing, resulting in dry and flaky skin with itchy symptoms. 2. Pathological factors Ichthyosis or sebaceous deficiency, psoriasis and other diseases, the symptoms itself will be aggravated in winter, will also aggravate the itching. At this time, on the one hand, we should strengthen the skin care, on the other hand, we also need to actively treat the above diseases. In addition, nutritional deficiencies and thyroid disorders can also cause itching. Because of the many causes of itchy skin in winter, it is recommended to go to the hospital in a timely manner, under the guidance of a professional doctor to clarify the specific causes, and then do the next step in the treatment, to avoid blindly using drugs.