Carotid blockage is a condition in which the carotid artery first has a narrowing and then for some reason the narrowing is more than 90% and can be severe enough to form a blood clot that can block the entire blood vessel. Symptoms of a blocked carotid artery include the possibility of also causing an infarction on one side of the brain, which can even be life-threatening. However, in most patients, before the carotid artery is occluded, there will be compensatory blood vessel formation, and even if the vessel is completely occluded, it will not reach very serious consequences, which may be related to the fact that the body has adapted to the sudden occlusion of the carotid artery.