The weakness of head and feet is considered to be cerebral ischemia, cervical spondylosis, functional neurological disorders and so on. 1. Cerebral ischemia: carotid artery plaque, low blood pressure, atherosclerosis, stroke and other diseases will lead to changes in cerebral blood flow, cerebral ischemia, causing symptoms of light-headedness and weakness of limbs. 2. Cervical spondylosis: cervical vertebrae osteophytes, prolapsed intervertebral discs, thickened ligaments, etc. will stimulate sympathetic nerves and compress the nerve roots and the cervical spinal cord, which will cause symptoms such as dizziness and weakness in the limbs. 3. Functional neurological disorders: vegetative nerve disorders, neurosis, etc. These disorders will lead to disharmony between the nerves and the internal organs, the cerebral cortex, etc., which will not be able to balance and coordinate and control the physiological activities of the body, resulting in some mental symptoms and physical symptoms. The weakness of the head and limbs should be taken seriously, and you can go to the hospital to get a clear diagnosis based on the symptoms and examination, and timely treatment.