Most of the patients with small cell lung cancer will be exposed to radiation therapy during the whole treatment process. Radiotherapy for small cell lung cancer is usually divided into several parts: 1. For other advanced small cell lung cancer, such as bone metastasis or other visceral metastasis, radiotherapy is usually used as a palliative treatment. There will be some side effects depending on the site of radiotherapy, but for most patients, the dose of radiotherapy can be tolerated, and it is the most cost-effective treatment method, so it should not be abandoned.