Insufficient cerebral blood supply itself is not serious, cranial CT is generally normal, cranial MRI can appear some ischemic foci, generally reversible, if a long period of insufficient cerebral blood supply may cause ischemic-hypoxic encephalopathy, patients with severe cerebral blood supply deficiency may also cause cerebral infarction. If a patient develops cerebral infarction, the condition is usually more serious. Patients may have somatic symptoms, such as hemiparesis, hemianopia and hemianesthesia, and may also have symptoms of consciousness, such as drowsiness, lethargy and coma patients, and may also have increased intracranial pressure, and patients may also have certain sequelae, which may lead to their death. If the patient is ischemic-hypoxic encephalopathy, generally can appear memory impairment, inattention and inattentiveness, mainly should be given to improve blood circulation and improve brain metabolism treatment, clinically commonly used drugs to improve brain metabolism, mainly Olacetam and Piracetam and so on.