How long can a patient live in the middle and late stage of lung cancer is mainly related to the malignancy degree of the tumor, the treatment method and the specific situation of the patient, which should be analyzed in specific issues. If the patient has more underlying diseases, such as hypertension, coronary heart disease, kidney disease, etc., and is in poor physical condition and cannot tolerate the treatment, and the tumor malignancy is also higher, such as small cell lung cancer, the survival period is only 2-3 months if no treatment is given; while the progress of intermediate and late stage squamous carcinoma is slower and distant metastasis is less, the survival period is about half a year if no treatment is given. If patients are in good health, they can be treated by surgery and postoperative adjuvant radiotherapy, chemotherapy and targeted therapy, which can extend the survival time and improve the quality of survival to a certain extent, and may survive for 3-5 years or more, the exact time varies from person to person. Patients with middle and late stage lung cancer should maintain an optimistic attitude and actively cooperate with doctors to carry out reasonable and effective treatment. During the treatment period, they should also pay more attention to rest and avoid eating greasy, cold and stimulating foods.