Numbness and lack of sensation in the scalp may be caused by diseases such as vegetative nerve dysfunction, cervical spondylosis and insufficient blood supply to the cerebral arteries. 1. Phytoneurological dysfunction: usually caused by recent excessive late night, mental overstress, brain fatigue, etc., which can lead to increased excitability of some areas of the cerebral cortex, resulting in disorders of the autonomic nervous system, numbness of the scalp may occur, and may be accompanied by symptoms such as dizziness, headache, panic. 2. Cervical spondylosis: If you maintain an improper posture for a long time, it will easily lead to tension and spasm of the neck muscles, which will pull and stimulate the vascular nerves of the scalp, and may cause numbness of the scalp with no sensation, accompanied by headache, neck and shoulder discomfort and other symptoms. 3. Insufficient blood supply to cerebral arteries: It can be caused by abnormal blood lipids, leading to increased blood viscosity, resulting in slow blood flow. Insufficient blood supply to the scalp due to insufficient blood supply to the cerebral arteries can cause numbness of the scalp with no sensation, accompanied by dizziness, drowsiness, weakness and other manifestations. Numbness of the scalp without feeling, should seek medical treatment as soon as possible, after diagnosis of the cause, by the doctor’s guidance for treatment.