The cause that causes cerebral blood - vessel block basically has two kinds : it is a head thrombosis , it is the pathological changes as a result of cerebral blood - vessel itself , often make the film inside tubal antrum coarse because of sclerosis of appearance of cerebral artery congee , be in charge of antrum stricture , below certain condition , if blood pressure is reduced , blood stream is slow , blood sticks consistency heighten , the cruor factor such as plaque , condense inside blood - vessel agglomerate , form cerebral thrombus 引起脑血管阻塞的原因主要有两种：一是脑血栓形成，它是由于脑血管本身的病变，常因脑动脉粥样硬化使管腔内膜粗糙，管腔狭窄，在某些条件下，如血压降低，血流缓慢，血液粘稠度增高，血小板等凝血因子，在血管内凝聚成块，形成脑血栓。
