Lung cancer in advanced stage usually cannot be cured by itself, and it needs regular radiotherapy, chemotherapy, targeted therapy, etc. to control the continuous deterioration of the disease, improve the quality of life and prolong the survival period. There is almost no cure rate for advanced stage of lung cancer, with high degree of tumor malignancy, distant metastasis and poorer prognosis, which may cause symptoms such as fever, cough, hemoptysis, hoarseness, pleural effusion, etc., and may also cause serious respiratory difficulties, and the condition can only be relieved by radiotherapy, chemotherapy and targeted therapy in the later stage. Radiotherapy and chemotherapy in the later stage may have certain side effects on the body, such as gastrointestinal reaction, massive vomiting, diarrhea and other symptoms, as well as rash, itching and other symptoms, which may be poorly tolerated if the physical condition is poor. Patients with advanced lung cancer should follow the doctor’s prescription for treatment, pay attention to balanced nutrition, eat more food with high protein content, eat more fresh fruits and vegetables, and pay attention to diet and good living habits.