There are several reasons for body numbness: first, intracranial lesions, such as brain tumors, brain hemorrhage, cerebral infarction, these lesions may affect the nerves of the brain and appear numbness of one limb. Second, neurogenic cervical spondylosis and lumbar disc herniation or stenosis of the spinal canal may produce extrusion and stimulation of the spinal cord and nerve roots, resulting in ischemia of the nerve bundles, which may lead to numbness of the limbs, or numbness-related symptoms of the upper and lower limbs on one side. Third, there may be an attack of hysteria, because in the process of hysteria there will be hyperventilation, the formation of respiratory alkalosis, it is easy to cause the body to appear numbness. Fourth, there is a possibility of poisoning, such as a large amount of orally administered raw epilobium, or organophosphorus pesticide poisoning, may affect the nerve tissue, and the body numbness symptoms.