The vast majority of lacunar infarcts in the brainstem may be clinically asymptomatic. However, its severity cannot be judged by clinical symptoms alone, but requires further examination to find the cause. If there is no problem with the main blood vessels of the brainstem, and the lacunar infarction is only caused by blockage of small branches, the risk of future morbidity is not too great through strict drug prevention. If, through some corresponding examinations, such as cranial vascular ultrasound, cranial CTA, or cranial magnetic angiography, it is seen that the main blood vessels of the brainstem have very serious narrowing, just like the pipes in the building, with more and more rust inside and very serious blockage of the pipes, then the possibility of cerebral thrombosis in the future is very high. Because the brainstem is the most important part of the brain, neurology is most concerned about brainstem infarction, so if the stenosis of the main stem vessels is very severe, the risk of developing is very high, and active medication is needed to treat and prevent it.