Some patients ask how to treat left carotid artery occlusion segment c3-7. Carotid occlusion is actually a special state of carotid artery stenosis, an extreme state in which the stenosis reaches 100% after the carotid stenosis has progressed and worsened. The treatment of carotid occlusion is also very different from ordinary carotid stenosis. Let’s first explain what carotid stenosis is. Carotid stenosis generally refers to the fact that, in the carotid artery vessels, due to long-term blood lipid deposition, attached to the inner wall of the vessel, over time, the formation of atherosclerotic plaque, occupying a certain luminal space, so that the carotid artery luminal space becomes narrow, forming carotid stenosis. Carotid artery stenosis will affect the flow of blood, resulting in insufficient blood supply to the brain, which can cause cerebral infarction in serious cases, and may even be fatal. Therefore, once carotid stenosis is detected, it should be treated early. So how to treat it? There are four levels of carotid stenosis, and their treatment varies. Carotid stenosis of less than 50% is called mild stenosis, stenosis of 50%-70% is called moderate stenosis, stenosis of 70% or more is called severe stenosis, and stenosis of 100% is carotid occlusion. According to the different levels of carotid stenosis, corresponding measures should be taken for treatment. For mild carotid stenosis, conservative medical treatment is generally recommended, taking antiplatelet drugs and plaque stabilizing drugs, paying attention to maintaining a healthy diet and lifestyle habits, and regular review; for moderate carotid stenosis, it is necessary to differentiate the situation, with no symptoms and stable plaque, conservative medical treatment is possible, while if ischemic symptoms appear or the plaque is unstable, surgery should be performed in a timely manner; for severe carotid stenosis, regardless of whether there are symptoms or not, and whether the plaque is stable or not, early surgery is recommended. At present, for moderate to severe carotid artery stenosis, carotid endothelial debridement surgery is performed to remove the atherosclerotic plaque under direct microscopic view, restore the smoothness of the inner wall of the carotid artery, restore the original internal diameter, and make the carotid artery blood flow smoothly, which can achieve good results and greatly reduce the chance of cerebral ischemia and cerebral infarction at a later stage. As for carotid occlusion, according to the patient’s specific situation, intracranial and extracranial vascular bypass should be adopted for treatment if necessary, which can also achieve the role of rebuilding cerebral blood flow, restoring cerebral blood supply and preventing cerebral infarction with good clinical effect.