Most of the blood supply deficiency is cerebral blood supply deficiency, which may be due to cerebral arteriosclerosis, increased blood viscosity due to high blood lipids, or cerebral ischemia due to spasm of vertebral basilar artery caused by cervical spondylosis, and atherosclerosis when shedding atheromatous plaque off will block blood vessels can also lead to insufficient blood supply. Another kind of insufficient blood supply may be cardiac coronary artery sclerosis, myocardial ischemia caused by ischemia, or myocardial infarction, which requires timely examination and treatment to avoid delaying the condition and endangering health.