How long to live in the late stage of lung cancer needs to be assessed based on the actual health status and various physical indicators of the patient, and the exact time cannot be specified. Lung cancer is a very common malignant tumor in the respiratory system, and brain metastasis, bone metastasis and liver metastasis can occur in the late stage of lung cancer. If brain metastasis occurs in advanced lung cancer patients, it can be manifested as headache and jet vomiting. With targeted drug treatment in advanced lung cancer, the survival period can still be 1-2 years or even longer. However, if no treatment is given, the patient’s survival period is only about half a year or even shorter. If bone metastasis occurs, pain in limbs may appear. Different types of lung cancer, with different metastases and different treatment methods, the final survival period will be different, and the exact time varies from person to person. Therefore, patients with advanced lung cancer should maintain an optimistic state of mind and actively cooperate with doctors for treatment, which can effectively prolong the survival period.