After a patient develops numbness in the hand, it is recommended to visit a neurology clinic. If the patient has numbness of the hand on the lateral side, the disease to be considered is acute cerebrovascular disease. For example, cerebral infarction or cerebral hemorrhage can cause numbness and discomfort in the contralateral limb when the lesion involves the fiber bundle that conducts sensation. If the numbness is in a single upper extremity or a single lower extremity, peripheral neuropathy, such as cervical spondylosis or lumbar spondylosis, needs to be excluded. In addition, patients with numbness in the hands that is bilateral and symmetrical also need to consider peripheral neuropathy. For example, the most common type of peripheral neuropathy is diabetic peripheral neuropathy, in which the patient has a diabetic base and often has poor glycemic control, resulting in glove-like or garter-like changes in the numbness. Therefore, after a patient develops numbness in the hands, it is recommended to visit the hospital to identify the cause.