Adverse effects of radiotherapy for small cell lung cancer include anemia, nausea and vomiting, skin damage and radiation pneumonia, etc. Radiation therapy needs to be carried out under the guidance of doctors. Small cell lung cancer can be helped to eliminate tumor foci and improve the prognosis of the disease through local radiotherapy, but as radiation also has certain damage to normal organs and tissues of human body, patients may suffer from various adverse reactions such as bone marrow suppression such as anemia, digestive discomforts such as nausea and vomiting, skin damages, and radiation pneumonia of respiratory system during radiotherapy. Therefore, small cell lung cancer patients are recommended to strictly follow the doctor’s instruction when undergoing radiotherapy, and need to consult the doctor in time after having adverse reactions.