Numbness of the head and legs may be due to cervical spondylosis, diabetic peripheral neuropathy, cerebral infarction and other reasons. 1. Cervical spondylosis: cervical spondylosis is a relatively common disease, usually leading to local nerve and blood vessel compression, resulting in numbness of the head and legs, and even accompanied by paroxysmal dizziness. 2. Diabetic peripheral neuropathy: a chronic complication caused by the continuous elevation of diabetes mellitus, during the onset of sensory nerves or autonomic symptoms, mainly head or leg numbness, and even numbness or pain in the limbs. 3. Cerebral infarction: Cerebral infarction is caused by ischemia or lack of oxygen in the brain, which leads to the death of the central nervous system and affects the function of the corresponding area. When cerebral infarction occurs in the brain area that governs skin sensation, the symptoms of head numbness or leg numbness may appear. When patients experience numbness of the head or legs, they need to go to the hospital in time to complete the relevant examinations, find the cause of the disease and standardize the treatment.