Increased blood flow velocity in cerebral arteries is generally considered to be common in the following two conditions: First, vasospasm. Patients can have transient blood vessels in a state of spasm due to exertion and tension, or stressful life and poor sleep. When cerebral vasospasm is obvious, there will be increased blood flow in the spastic vessels, and the patient may also have headaches, which can be accompanied by severe neurological deficits. However, after treatment, when the cerebral vascular spasm is relieved, the symptoms will disappear. Second, increased flow velocity in cerebral arteries can also be seen in vascular stenosis. Vascular stenosis, commonly seen in patients with atherosclerosis, is caused by the thickening of the intima and the formation of plaque leading to narrowing in the lumen, and the same blood flow over the narrowed area will show an increased blood flow rate. For this kind of atherosclerosis-induced increased blood flow, it is recommended to further improve the head magnetic resonance angiography MRA or CTA, as well as to take blood to check the liver and kidney function, blood sugar and lipids, and to measure blood pressure; the patient should take oral medication to protect the intima, such as Lipitor, and control the vascular risk factors. The imaging should be reviewed in six months to a year.