The numbness of the hand in cold water and wind may be caused by local vasospasm, arthritis and peripheral neuritis. 1. Local vasospasm: when the hands are exposed to cool water and then stimulated by cold wind, it may lead to local muscle contraction and local vasospasm, thus causing numbness of the hands. 2. Arthritis: numbness of the hands after exposure to cold water or wind may also be caused by arthritis, and patients may also experience local joint swelling and pain. 3. Peripheral neuritis: If the patient has peripheral neuritis, it can be manifested as sensory, motor and autonomic dysfunction in the distal limbs. When the patient’s hands are stimulated by the outside world, numbness and pain may occur. Therefore, if the patient’s hands are exposed to cold water and blowing in the wind after the obvious numbness symptoms or accompanied by other symptoms of discomfort, you should promptly go to the hospital for examination, to clarify the cause of the disease, for treatment.