Carotid artery stenosis poses a threat to the life of patients, and people should pay attention to this disease. As the main channel of blood supply to the brain, carotid artery stenosis occurs when lipid deposits occur in the vessel wall, forming carotid plaque and blocking the lumen of the vessel. What are the diagnostic criteria for carotid stenosis? Some people have symptoms of carotid stenosis and some people do not. Those with symptoms may experience dizziness, difficulty moving, blurred vision for a short period of time, or sudden blackness in front of the eyes, which may return after a short period of time. In some cases, sudden numbness in the arms and legs, or weakness in half of the arms and legs, may return to normal after a few hours. In asymptomatic cases, less than 70% of carotid artery stenosis is not felt and is only detected during a physical examination. If patients suspect that they have carotid stenosis, they can go to a regular hospital for examination. Magnetic resonance angiography and CT angiography are helpful in diagnosing and confirming the patient’s condition. Once patients are diagnosed with carotid stenosis, they should choose treatment as soon as possible. Patients can choose carotid endarterectomy for the treatment of carotid stenosis, which is an effective method to prevent cerebral infarction because of its fast onset, precise efficacy and low restenosis rate, and is therefore highly respected in the industry.