Half of the head numbness can be caused by a variety of reasons, generally consider the cerebral blood supply is insufficient, craniocerebral tumor, cervical spondylosis and other causes. Physicians need to take appropriate treatment measures and methods according to different causes. 1. Insufficient cerebral blood supply: Due to long-term high blood pressure, high blood fat, high blood sugar and cerebral arteriosclerosis and other triggers, it can lead to insufficient cerebral blood supply, which manifests as numbness and other symptoms of the head. 2. Craniocerebral tumor: For example, if the patient has a brain tumor, due to the compression of the tumor growth leads to the increase of intracranial pressure, the numbness of the head along with the headache, vomiting and other symptoms can appear. 3. Cervical spondylosis: due to the spasm of neck and shoulder muscles or cervical vertebrae compression of nerves, numbness of the head, accompanied by dizziness, numbness of the limbs and other symptoms. Half of the head numbness need to go to the hospital for examination and later clear diagnosis, the cause is not clearly diagnosed before do not indiscriminate use of drugs.