Increased blood flow in the vertebral artery is usually detected during transcranial Doppler examinations, and in itself, increased blood flow does not have a significant impact on the brain or blood vessels. The problem reflected by this condition is the narrowing of the vertebral artery, which may lead to a decrease in blood supply to the brain, especially when the cervical spine is cold and when the head is turned violently, resulting in a sharp decrease in blood supply to the brain due to vertebral artery strain and, in some cases, even spasm of the vertebral artery as a result of irritation. The main harm is the formation of thrombus or plaque in the vertebral artery on the way to blood supply, and if the thrombus and plaque fall off, it will lead to cerebral infarction in the brain, which may lead to unstable vital signs and life-threatening conditions over time.