The vertebral artery is one of the two major circulations supplying the cranial vasculature. The vertebral artery is part of the posterior circulation, while the anterior circulation is mainly the carotid artery. Of course, not all dizziness is caused by vertebral artery ischemia. However, if the vertebral artery is narrowed or even occluded, the most common symptom is dizziness; 2, more serious may be that some elderly people may have unstable walking, after walking for a long time, not only dizziness, but also unstable walking, wobbling and unable to walk a straight line, which is also a symptom of vertebral artery lesions; 3, more serious patients appear drowsy, that is, the reticular pro-wake system. This is more serious; 4, brainstem lesions, the most serious lesion of the posterior circulation of the vertebral artery is the brainstem symptoms. Brainstem ischemia will soon lead to impaired consciousness, hemiplegia, and even respiratory circulation, that is, unstable changes in breathing and heartbeat. Even cardiac arrest, respiratory arrest, these life-threatening clinical symptoms. So be sure to be cautious and vigilant about lesions in the posterior circulation, that is, the vertebral artery area.