Precautions during chemotherapy for lung cancer are as follows: 1. diet: eat a balanced diet, avoid greasy, fried and stimulating foods, and eat more high-protein and high-nutrition diet; 2. avoid staying up late, get up early and go to bed early, and maintain regular living habits; 3. maintain an optimistic mood, understand lung cancer-related knowledge, and do moderate exercise; 4. for patients with underlying diseases, such as hypertension and diabetes, they should take standardized treatment For patients with underlying diseases, such as hypertension and diabetes, they should take drugs for the treatment of hypertension and diabetes. Patients with lung cancer should also follow medical prescriptions for standardized treatment during chemotherapy in order to achieve better treatment effect.