Hand numbness for three years is divided into physiological and pathological, pathological causes are orthopedic diseases, endocrine diseases and other diseases, not necessarily a serious disease. 1. Physiological: if long time typing, writing and lifting things and other hand activities, will produce hand numbness phenomenon, which is a normal physiological phenomenon, can be relieved by rest, without additional special treatment. 2. Pathological: orthopedic diseases can cause hand numbness, such as cervical spondylosis, carpal tunnel syndrome and spinal cord injury and other diseases can lead to numbness because of compression of the nerves; diabetes and other endocrine diseases can also be due to sensory abnormalities and thus produce numbness of the hands; vitamin B12 deficiency and other diseases are also one of the reasons. If hand numbness can not go away by itself, it is recommended to go to the hospital in time to find out the cause, and if it is pathologic, it is necessary to carry out professional and standardized treatment in a timely manner.