The reasons for half of the scalp numbness are as follows: 1, may be caused by cold, resulting in the contraction of the blood vessels under the patient’s scalp, the nerves under the scalp will be stimulated to appear the symptoms of scalp numbness. 2, consider the possible relationship with cervical spondylosis, when the patient has cervical spondylosis improper posture, the neck muscles are in tension, pulling state easily lead to the performance of the patient’s side of the scalp numbness, swelling and pain. The patient does acupuncture or massage the neck, the symptoms may be improved. 3, half of the scalp numbness may also be caused by poor sleep, fatigue, mental tension and other factors, is a functional problem.