Tightness and numbness at the top of the head may be caused by vegetative nerve dysfunction, cervical spondylosis, insufficient cerebral blood supply and other reasons. 1. Phytoneurological dysfunction: this disease is usually due to long-term mental trauma, poor living habits, etc., resulting in increased local excitability of the cerebral cortex, resulting in neurological disorders, dysregulation of the autonomic nervous system, there may be tightness in the top of the head, numbness, and may also be accompanied by panic, insomnia and other symptoms. 2. Cervical spondylosis: Especially for patients with cervical disc herniation, if they keep incorrect posture for a long time, it will easily lead to the stimulation of blood vessels and nerves in the head, which will cause tightness and numbness in the top of the head, and may be accompanied by dizziness, neck and shoulder pain and discomfort and other symptoms. 3. Insufficient blood supply to the brain: usually due to atherosclerosis, resulting in narrowing of the blood vessel lumen, thickening of the blood vessel wall, decreased vascular elasticity, resulting in a certain period of time the flow of blood through the brain is relatively reduced, resulting in ischemia of the brain tissue, hypoxia, which may lead to tightness in the top of the head, numbness, can be accompanied by dizziness, headache and other symptoms. Tightness and numbness of the top of the head may also be caused by other reasons, if the symptoms continue to be unable to alleviate, or there are other symptoms of discomfort, you should consult a doctor as soon as possible, after diagnosing the cause, the doctor guides the treatment.