Itching is the most common symptom of skin diseases, and pruritus is also one of the common clinical skin diseases; so is it that all diseases with itching are pruritus? Of course not, pruritus is a skin disease with no primary lesions on the skin, only itching, and scratching can provoke damage. It can be divided into two types: generalized and limited. Restricted pruritus is confined to one area (e.g., anus, scrotum, female genitalia, head, etc.); generalized pruritus is widespread throughout the body. What are the causes of pruritus? The etiology of limited pruritus is often related to tight undergarments, moisture at the vulva, and local irritation; whereas generalized pruritus may be related to the seasons, hot and cold stimuli, stimulation by physical and chemical factors, pregnancy, sunlight, and certain medical diseases (e.g., diabetes, renal failure, thyroid disease, visceral malignancies, lymphoma, anemia). Pruritus is mostly seen in the elderly, so why is pruritus more likely to occur in the elderly? More should not be underestimated? 1, the elderly skin physiological function is reduced, dry skin, sensitive to the stimulation of hot and cold changes in the surrounding environment; 2, living habits some elderly people love to take hot baths, rubbing baths, etc., so that the skin lost the sebum moisturizing; 3, the elderly are prone to diabetes, kidney failure, thyroid disease, visceral malignancies, lymphoma, anemia and other medical diseases. Therefore, geriatric pruritus, especially stubborn patients need to actively find the cause.