Carotid stenosis is a narrowing of the carotid artery lumen caused by various reasons such as atherosclerosis, which leads to cerebral ischemia and insufficient blood supply to the brain, and is the primary cause of cerebral infarction. The carotid artery is the main “road” supplying blood to the brain and face, so it is conceivable that the consequences of carotid stenosis, or blockage of the carotid artery, can be unimaginable. Carotid artery stenosis mostly occurs in the elderly, and the early manifestations of patients are mainly sleeplessness, confusion, and memory loss. Further development may lead to acute cerebral infarction and so on. Therefore, in daily life, we must give more attention to the elderly at home, and if similar symptoms of carotid stenosis appear, we must go to the hospital for examination in a timely manner. If the test results confirm the diagnosis of carotid stenosis, there is no need to worry too much. Early carotid artery stenosis can be controlled by medication, but in the middle and late stages of carotid artery stenosis, surgical intervention is required. Currently, there is a medical procedure to prevent cerebral infarction for carotid stenosis, which is called carotid endarterectomy. Many patients may not understand what carotid endarterectomy is, but carotid endarterectomy is a surgical procedure performed under a microscope. By finding the diseased arterial lining under a microscope, the lining is peeled off and removed to smooth the walls of the carotid artery and restore smooth blood flow.