Elderly people with itchy skin all over the body may be caused by geriatric pruritus, urticaria, hepatitis and other diseases. 1. geriatric pruritus: this disease is due to sebaceous gland hypoplasia, resulting in reduced sebum secretion, excessive skin dryness caused by factors such as excessive scalding of the skin can be induced, followed by the patient elderly people will appear all over the skin itchy symptoms. 2. Urticaria: This disease is mainly caused by contact with allergens, commonly found in pollen, animal dander, sunlight, etc., but also with viruses, bacteria, fungi, parasitic infections and mental stress and other factors. Typical symptom is that red or white skin masses will appear all over the body, mostly accompanied by itching, so the elderly may have itchy skin all over the body due to urticaria. 3. Hepatitis: the cause of the disease is more complex, including pathogenic microbial infections, obesity, immune disorders, long-term intake of alcohol, etc., some types of hepatitis has a certain degree of contagiousness, asymptomatic in the early stage, with the development of the disease, the patient will appear all over the body itchy skin, loss of appetite, spider nevus and other symptoms. 4. Other: In addition, the elderly itchy skin may be caused by ringworm, eczema, contact dermatitis and other diseases. When the elderly have itchy skin, they should go to the hospital, cooperate with the doctor to improve the relevant examination, to clarify the cause of the disease.