Numbness of both upper limbs may be caused by long-term compression of upper limbs, cerebral infarction and cervical spondylosis. 1. Long-term compression of the upper limbs: patients keep a posture for a long time, such as lying on both upper limbs to sleep, will make the upper limbs are compressed, the blood of the upper limbs does not circulate, which leads to the symptoms of numbness of both upper limbs. 2. Cerebral infarction: cerebral infarction patients with brain blood supply obstacles, so that the local brain tissue, nerve conduction bundles are damaged, which will appear on one side of the upper limb or even double upper limb numbness symptoms. 3. Cervical spondylosis: when the patient suffers from cervical spondylosis, it may compress the surrounding nerves, resulting in symptoms of numbness of both upper limbs, usually accompanied by pain. Numbness of both upper limbs may also be caused by peripheral neuritis, Guillain-Barré syndrome and so on. If the numbness of both upper limbs cannot be relieved, or is accompanied by other symptoms, you should go to the hospital in time to clarify the cause of the disease and actively cooperate with the doctor for treatment.