Lung cancer that metastasizes to the brain is usually stage IV, which is the most advanced stage. At this time, symptoms of intracranial hypertension will usually appear, including headache, dizziness, and jet nausea and vomiting. At this time, if no treatment is done, it is usually one to three months at most. If treatment is done, generally chemotherapy for cranial metastases is not effective, only radiotherapy can be done, and if radiotherapy is done, this treatment will be extended for a few months (if the effect is good). But if the metastasis is extensive and dense, like the stars, the effect of radiotherapy will not be very good.