Dizziness and nausea caused by carotid artery stenosis is more serious. Generally speaking, unilateral carotid artery stenosis, because the opposite side of the carotid artery has a compensatory function, there is generally no clinical symptoms, only a small number of people will experience dizziness, headache and so on. However, if the carotid artery stenosis is bilateral, it will lead to a decrease in cerebral perfusion, and cerebral blood supply insufficiency can occur in severe carotid artery stenosis. Clinically, it manifests as dizziness, headache, memory loss, tinnitus and other symptoms. If the above symptoms are not taken seriously and treated in time, and the degree of carotid artery stenosis worsens, transient ischemic attacks can occur, such as transient weakness of the lateral limbs, numbness of the limbs, haze, and sensory disturbances. If the degree of stenosis is not improved for a long time, it will cause ischemic stroke, hemiplegia, speech dysfunction, etc., which can be serious and life-threatening. If dizziness and nausea are indeed caused by carotid artery stenosis, it is important to actively visit the neurology department for treatment to improve symptoms and avoid cerebrovascular accidents.