Stroke, or stroke as we usually call it, is the first disease that causes disability in adults and one of the three leading causes of death. According to the Ministry of Health, there are more than 3 million new cases of stroke in China each year, 80% of which are ischemic strokes. Among the many causes of ischemic stroke, stenosis of the blood supply arteries is one of the most important causes. There are many doubts and misconceptions about the diagnosis and treatment of cerebral blood supply artery stenosis. (1) What are the blood vessels of the blood supply to the brain? A: There are four main cerebral blood supply arteries, namely the bilateral carotid arteries and the bilateral vertebral arteries. Both carotid and vertebral arteries can be stenosed (2) What are the causes and consequences of stenosis of the cerebral blood supply arteries? A: The most common cause is atherosclerotic plaque formation. In addition, radiation therapy, tumor compression, myofibrillar dysplasia, and aortitis can also cause narrowing of the cerebral blood supply arteries. The narrowing of the cerebral blood supply artery directly leads to insufficient blood supply to the brain. In addition, the detachment of atherosclerotic plaque can cause the blockage of intracranial vessels, forming cerebral infarction. (3) Are there atherosclerotic plaques and stenosis in your blood supply arteries? A: When symptoms such as recurrent syncope, or even hemiparesis, aphasia, coma, vertigo, diplopia, ataxia, balance disorder, and dysphagia occur, one must beware of the presence of stenosis of the blood supply arteries to the brain. In addition, some patients, especially middle-aged and elderly patients over 50 years old, do not have the above symptoms, but may still have severe stenosis. (4) What tests can determine whether you have stenosis of the blood supply arteries to the brain? A: Neck ultrasound has the advantages of being non-invasive, convenient, and less expensive, so it is ideal for screening. If ultrasound finds problems, further CTA or DSA examinations are required, of which DSA is the gold standard for diagnosis. (5) Can all strokes be prevented by medication alone for cerebral blood supply artery stenosis? A: There is a misconception that medication is safe and all-purpose. In fact, when the lesion has developed to a certain extent, medication alone cannot prevent stroke. (6) Is there anything else we can do for patients whose medication does not work? A: Yes! In addition to carotid endarterectomy, we can perform stent implantation for stenosis of cerebral blood supply arteries.