Hand numbness is a subjective sensory symptom, suggesting a problem with the sensory nerves and receptors in the hand. The causes include physiological and pathological, and require specific analysis of the problem. External stimulation and internal stimulation too strong, too frequent, if more than the ability to accept the sensory nerves in the hand will appear numbness symptoms. External stimuli include prolonged exposure to wind, cold, a certain posture for too long, hand pressure, internal stimuli include high mental tension and so on. This situation out of the external environment, a change of posture, relaxation, rest will be able to completely improve, which is the physiological response does not need to worry too much. If the numbness of the hand can not be relieved even after a long period of rest, it is necessary to exclude certain diseases, such as stroke, cervical spondylosis, carpal tunnel syndrome, elbow tunnel syndrome, etc., which compress the sensory nerves in the hand. In addition, diseases affecting blood circulation in the hands, such as arteriosclerosis of the upper extremities, various inflammatory diseases of the upper extremities, trauma, poisoning, and nutrient deficiencies can all present symptoms of numbness in the hands. If the symptoms persist, it is recommended to visit a hospital.