The causes of 55-year-old head numbness include physiological factors, respiratory alkalosis, autonomic dysfunction, vascular lesions and so on. 1. Physiological factors: for example, after the patient’s head is stimulated by cold air, he or she may consciously have the performance of head numbness, and can be relieved after removing the causative factors. 2. Respiratory alkalosis: when the patient is agitated, shortness of breath, resulting in mental hyperventilation, excessive carbon dioxide discharged from the body may cause respiratory alkalosis, the patient may have a numbness of the top of the head. 3. Autonomic dysfunction: irregular daily life or excessive psychological pressure, etc., may cause autonomic dysfunction, the onset of the patient may be conscious of the symptoms of numbness in the head. 4. Cerebrovascular disease: cerebrovascular stenosis, hardening, plaque, etc. can cause cerebral ischemia and hypoxia, causing numbness in the head. There are many causes of numbness of the head, it is recommended to go to the hospital in time for consultation and treatment, to clarify the cause, symptomatic treatment.