Subclavian artery stenosis refers to the presence of plaque in a portion of the arterial vessels located under the clavicle, resulting in narrowing of the official lumen. When the subclavian artery is narrowed, it can lead to carotid artery theft, resulting in inadequate intracranial blood supply and further complications such as cerebral ischemia and cerebral infarction. In addition, it is important to assess whether stenosis exists in the lower extremity vessels. On the other hand, the most common cause of stenosis is atheromatous plaque formation, and there are also some rare causes, such as stenosis caused by the compression of lesions in other areas. medication or stenting is required.