There are many causes of itchy skin in the elderly, including external factors, physiological factors and pathological factors. The specific situation requires specific analysis, and can not be generalized, usually has the following possibilities: 1, external factors: 1, climate change: If the elderly often in the seasonal changes in the symptoms of itchy skin, then consider the skin itching caused by climate change, usually in winter this situation is more obvious. Winter when the indoor temperature is high and dry, so that sebum secretion less, the symptoms of itching; 2, local stimulation: the elderly long-term hot water scalding, there may be the habit of using soap bath, will lead to dry skin and aggravate the itching. Second, physiological factors: 1, sebaceous gland atrophy: the elderly due to age, sebaceous gland atrophy, resulting in reduced sebum secretion, skin itching; 2, sleep disorders: some older people have poor sleep, including reduced sleep time, as well as sleep is fragmented. At this time, the skin does not get sufficient rest, and itching is easy to appear. Third, pathological factors: 1, insect bite dermatitis: if the elderly skin itching and edematous maculopapular rash, it may be caused by mosquito bites, clinically known as insect bite dermatitis, should avoid scratching, can gradually subside; 2, elderly skin pruritus: if the elderly only itchy skin, feel abnormal feelings such as insect crawling, and no erythema, papules and other symptoms, it is considered to be due to the decline of the body’s metabolic function and lead to skin disease, that is, pruritus of the elderly; 3, allergies: such as allergic dermatitis, eczema, can cause the elderly skin itching, may also be accompanied by redness, pimples and other accompanying symptoms appear; 4, fungal infection: fungal infection can cause itchy skin, if the itchy area has flaking, redness and other manifestations, it is recommended to go to the hospital, after fungal examination, under the guidance of the doctor with drug treatment; 5, mental illness : some elderly people due to mental illness, may also lead to itchy skin; 6, diabetes: elderly people suffering from diabetes, abnormal blood sugar metabolism prone to fungal skin infections, as well as itchy skin and other symptoms; 7, abnormal internal organs: such as liver function, abnormal kidney function, kidney failure, urine in the toxin discharge disorder, resulting in urea deposition under the skin, itchy skin; 8, malignant tumors. In the case of elderly people suffering from malignant tumors, some inflammatory factors secreted by tumor tissues can also lead to itchy skin. If the patient’s itching worsens and affects life, or if other symptoms accompany the disease, he or she should go to the hospital as soon as possible to avoid delaying the treatment.