The causes of excessive cerebral blood flow are as follows: 1. Generally, excessive cerebral blood flow is mostly mentioned in the examination report of intracranial Doppler, which is mainly seen clinically as a result of cerebral vascular spasm. As a result of cold, cold, poor rest stimulation, can appear cerebral vasospasm and manifest as increased blood flow, can appear dizziness, headache symptoms. The treatment can be oral drugs to relieve vasospasm, such as flunarizine hydrochloride.2. Excessive cerebral blood flow can also be seen due to narrowing of blood vessels, especially in people with heavy cerebral arteriosclerosis, due to thickening of the intima and narrowing of the lumen, the blood flow will increase in speed when it passes. For patients with cerebral atherosclerosis, oral statin lipid-lowering drugs are recommended, and stenting and other treatments can be performed if necessary.