Often see or hear many people say hand numbness, hand weakness, common causes are summarized in two: a. Median nerve palsy (carpal tunnel syndrome): numbness of the radial side of the palm of the hand, sometimes to the elbow dispersion, day and night performance varies, and how much wrist activity, many people according to tenosynovitis closed treatment; or according to cervical spondylosis treatment; or according to the cavity infarction treatment, but the results are not good. After a long time, many small fine movements will be uncomfortable, hand small muscle atrophy, affecting daily life. It used to be seen in women before and after menopause, but now it is seen in young and old. Second, numbness and pain on the ulnar side of the hand, the ring and little finger cannot be straightened, holding chopsticks uncomfortably, and riding a bicycle is even more uncomfortable, and most of the consultations are treated as cervical spondylosis or cerebrovascular disease, but there is no effect. Wait until the muscles between the thumb and index finger atrophy, late. In fact, it is just ulnar nerve damage and elbow canal syndrome. A minor surgery can solve the problem. The above diseases can be diagnosed by electromyography.