The causes of itchy skin in the elderly include skin diseases such as pruritus, tinea corporis, or internal systemic diseases such as uremic pruritus and diabetes mellitus. 1. Skin diseases: the elderly with age, immunity, skin locking and hydration function and skin protection function gradually decline, prone to skin diseases, such as pruritus, tinea corporis, atopic dermatitis, urticaria, contact dermatitis, etc., are likely to appear itchy skin symptoms. 2. Internal medicine system diseases: internal medicine system diseases, including uremia itching in renal disease, cholestatic itching in liver disease, thyroid disease, diabetes mellitus and malignant tumors, etc., will also appear itchy skin symptoms. Elderly itchy skin may also have other causes, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease to give targeted treatment.