Precautions for radiotherapy for small cell lung cancer include nutrition protection, attention to keeping warm, regular rechecking, and attention to treating adverse reactions caused by radiotherapy. 1. Guarantee nutrition: small cell lung cancer is a consumptive disease, radiotherapy needs to consume large amount of energy, so after radiotherapy, nutrition should be guaranteed, try to choose high protein and high vitamin diet which is easy to be digested and absorbed, and don’t eat stimulating, spicy and too greasy food. 2. Pay attention to keeping warm: the body is relatively weak after radiotherapy for small cell carcinoma, usually pay attention to keeping warm, try to avoid catching cold and not catching a cold or fever. 3. Regular review: after radiotherapy for small cell lung cancer, it is necessary to have regular review, some lesions do not shrink obviously during or at the end of radiotherapy, but may shrink obviously after one month, and the efficacy of radiotherapy is usually evaluated one month or even three months after radiotherapy, so it is more important to go back to the hospital for review on a regular basis. 4. Treatment of adverse reactions: there will be more adverse reactions after radiotherapy, such as myelosuppression, after myelosuppression, white blood cells, platelets and hemoglobin will be reduced to different degrees, and then it is necessary to target the treatment, such as injection of white blood cells to promote white blood cells, generally using recombinant human granulocyte stimulating factor, and platelet transfusion of platelets for treatment of platelet decline. Precautions after radiotherapy for small cell lung cancer, specifically you can consult the doctor to understand.