There are many reasons why patients suddenly feel numbness in the head: 1, clinically the most common is to feel numbness in the head all of a sudden when mental tension, which is a normal physiological phenomenon, related to the patient’s emotions and psychological factors. 2, many people in the brain overuse or extreme fatigue, there will be numbness in the head, through the adjustment of the later to be able to get relief. 3, if the elderly suddenly feel numbness in the head, it may be related to insufficient cerebral blood supply or cerebral vasospasm, or may also be caused by elevated blood pressure. If the elderly suddenly feel numbness in the head, it may be related to insufficient cerebral blood supply or cerebral vascular spasm, or it may be caused by elevated blood pressure, this kind of patient is recommended to improve the blood pressure, blood rheology, and transcranial Doppler examination to make it clear.