A tap water pipe will produce scale under our long-term use; so what will our blood vessels produce as we age? Atherosclerotic plaque will be produced. This atherosclerotic plaque with the same nature as “limescale” adheres to the walls of blood vessels for years and years, causing narrowing of blood vessels, and if longer, it will cause occlusion of blood vessels. Carotid artery blockage is also caused by atherosclerotic plaque, which is a very specific type or stage of carotid artery stenosis. To put it bluntly, carotid artery blockage is carotid artery stenosis with 100% stenosis, the rest of the stenosis within 50% is mild stenosis, stenosis between 50% and 70% is moderate stenosis, and stenosis above 70% is severe stenosis. Knowing how to define carotid artery blockage, what are the symptoms of carotid artery blockage? Once the blockage of carotid artery occurs, it may be manifested as different degrees of weakness of one limb or one side of the body, partial sensory impairment, aphasia, dizziness, visual impairment of one eye, etc. In severe cases, cerebral hemorrhage or cerebral infarction may occur, which may lead to hemiplegia, disability, and even life-threatening. This is because carotid occlusion is the most serious form of carotid artery stenosis, which is very dangerous. Imagine that the lumen is blocked and the blood flow is completely blocked, which may lead to a large cerebral infarction at any time, causing immeasurable and serious consequences, so surgery should be performed as soon as possible.