Dizziness and drooling should be considered as a result of multiple cerebral infarcts or ischemia in the posterior circulation in the elderly. If dizziness and lethargy are accompanied by speech clumsiness, drooling or choking on drinking water, and numbness and weakness of the lateral limbs, it is important to consider whether there is a brainstem infarction, and a head MRI should be done in a timely manner. If there is only dizziness, drooling, slow reaction, and calculation, memory or other intelligent function impairment, previous hypertension, diabetes mellitus, etc., combined with the previous history of multiple cerebral infarcts, consider the intelligent impairment brought about by multiple lacunar infarcts later on, and consider lacunar state after reviewing the head imaging if there is no new infarcts in the brainstem or new infarcts in other locations. This condition is lighter than brainstem infarction, but at the same time, further aggravation of infarction should be noted, and it is necessary to strengthen the oral oral secondary prevention of cerebrovascular disease and consolidation therapy.