Whether a brain lesion is serious or not depends on the specific type of lesion, and the following are the main considerations: 1. Infarct foci: If it is a cerebral infarction, it depends on the period of the disease, the site and area of the infarction, etc. If the area of infarction is relatively large, or if it is a brain stem infarction, it is usually more serious. If the infarction is old, it will not have any effect on the present even after a long time.2. Hemorrhagic foci: it depends on the amount of hemorrhage and hemorrhage site, if the amount of hemorrhage is very large or the hemorrhage site is more important, it will be more serious, and even so serious that it will affect the life.3. Occupation foci: if the occupying site is considered to be the primary occupying site or the metastatic occupying site, then it is necessary to further examine in detail, to see whether it is the lungs, or the metastasis of the abdominal cavity organ. The patient should be examined in detail to see whether it is metastatic from the lungs or abdominal organs.