Most of the rapid carotid blood flow is due to the presence of spasm of the carotid vessels. It is caused by carotid atherosclerosis, which is a sign of insufficient blood supply to the cerebral arteries. Specifically, accelerated blood flow indicates arterial stenosis and the formation of vortices as blood flows through, and slow blood flow indicates significant atherosclerosis with little difference between the two sides. Slow blood flow may lead to ischemia in the posterior circulation and, over time, to dizziness and headache. If the patient is temporarily untreatable without significant dizziness, he or she can have regular color Doppler ultrasound of the neck vessels and transcranial Doppler ultrasound to understand the changes in blood flow velocity each time. Diet should be observed to control fat intake and blood lipid check. The patient should also pay attention to rest and avoid sudden head turning movements. Oral Nimotope and Ginkgo biloba can be taken to improve cerebral blood supply, or oral aspirin tablets for antiplatelet aggregation and fluvastatin tablets for lipid regulation.