The carotid artery is the main channel for supplying blood to the brain, and if there is a problem with the carotid artery, the effect is imaginable. Currently, many people suffer from carotid stenosis, a cerebrovascular disease that narrows the blood supply to the brain and causes many problems, including cerebral ischemia and cerebral infarction. Carotid artery stenosis should be detected and controlled early so that more problems can be avoided. There are two ways to treat carotid artery stenosis, mainly conservative medication and surgical treatment. What level of carotid stenosis requires surgery? The need for surgery for carotid stenosis is determined by the degree of stenosis. Generally speaking, patients with carotid artery stenosis of less than 50% do not need surgery. Rational medication, standardized living, appropriate exercise and regular checkups can play a good role in controlling the stenosis; while for patients with carotid artery stenosis of more than 70%, medication is not effective and surgery is needed to stabilize the condition and promote recovery. Carotid endarterectomy is the most advanced and effective method for the treatment of moderate to severe carotid artery stenosis. Carotid endarterectomy can peel off the sclerotic plaques that have accumulated in the lumen of the carotid artery over the years and help restore blood flow in the lumen of the carotid artery, thus improving the symptoms of cerebral ischemia in patients. However, in order to better consolidate the postoperative effect, patients must also strictly follow the doctor’s prescriptions for postoperative medication, as well as regular follow-up examinations in order to understand the local changes of the blood vessels. In addition, patients should also take care of their diet to help restore their health in all aspects.