Numbness of one hand may be a symptom of cervical spine disease, cerebrovascular disease, or it may be caused by local nerve injury, nerve compression or peripheral neuritis, but it is difficult to say what disease is the sign of. 1. Cervical spine disease: when the herniated intervertebral disc compresses the nerves of the arm, the symptoms of numbness of one or both limbs may appear, accompanied by neck discomfort, dizziness, headache and other symptoms, which can be diagnosed by checking the cervical spine film, and then improve the symptoms by traction and drug treatment. 2. Cerebrovascular disease: the symptoms of numbness of one side of the limbs, we should be alert to the occurrence of cerebrovascular disease, such as cerebral hemorrhage, cerebral infarction, etc., because of the early treatment of cerebrovascular disease has a better effect, you can check the cranial CT to confirm the diagnosis, and treat it as soon as possible, so as not to leave the sequelae of cerebrovascular disease. 3. Traumatic injury: such as contusion, cutting and other injuries to the nerves of the upper limbs, numbness of the upper limbs can also occur, and patients usually have a history of trauma. 4. Nerve compression: such as local lipoma, fibroma, tendon sheath cysts, etc. caused by nerve compression, there will be local lumps. 5. Peripheral neuritis: mostly as a complication of diabetes mellitus, peripheral neuropathy due to fluctuation of blood glucose, there can be localized symptoms of numbness. Numbness of one hand, usually need to go to the hospital as soon as possible to confirm the diagnosis, under the guidance of the doctor to clarify the cause and treatment, in order to avoid delay.