The basis for determining cerebral insufficiency is mainly the following: First, the clinical symptoms of the patient. Patients often complain of dizziness, accompanied by visual rotation and postural changes unrelated, and the dizziness lasts for a long time, usually in tens of minutes or hours, mostly without autonomic symptoms, such as sweating, panic, serious patients can also have nausea, vomiting. Second, the patient’s medical history. The elderly and have hypertension, diabetes, hyperlipidemia and other underlying diseases, resulting in atherosclerosis or atheromatous plaque formation, secondary stenosis of blood vessels, prone to spasm, often causing cerebral blood supply deficiency. Third, objective examination. You can improve the cranial magnetic resonance examination to clarify whether the patient has ischemic manifestations such as cerebral white matter degeneration and cerebral white matter osteoporosis, or you can improve magnetic resonance angiography, neck vascular ultrasound and other examinations to directly clarify whether there is vascular stenosis or atherosclerosis and plaque formation.