Cerebral blood supply insufficiency is mainly caused by cerebral atherosclerosis, narrowing of blood vessels and ischemia and hypoxia of brain tissue. At the onset of the disease, there is usually no pressure on one side of the head, and there are often symptoms such as dizziness, vertigo, nausea, and numbness of the limbs. The symptoms of pressure on one side of the head are considered to be related to tension headache, cervical spondylosis and mental illness. 1. Tension headache: the onset of this disease may appear on one side of the pressure, and accompanied by nausea, vomiting and other symptoms. 2. Cervical spondylosis: If the nerve root in the high neck is compressed, it can radiate to the posterior occipital region, and the patient can show a feeling of compression on one side of the head. 3. Mental illness: when the patient suffers from mental illness, some physical symptoms can appear, such as the symptoms of one side of the head with a sense of pressure. One side of the head with a sense of pressure to the hospital to see a specialist to determine the cause of the disease, do targeted treatment.