According to the comparison of various aspects of lung cancer, such as pathological nature, growth rate, metastasis time and treatment effect, under the same conditions, small cell lung cancer is generally more serious. Small cell carcinoma is a kind of neuroendocrine carcinoma among lung cancer types, accounting for 15%~20% of all lung cancers. Small cell carcinoma is the least differentiated and the most malignant among lung cancers, with fast growth speed, early metastasis and poor surgical resection, with a five-year survival rate of only 1%~2%. Non-small cell lung cancer is a collective term for lung cancers other than small cell lung cancer, including adenocarcinoma, squamous cell carcinoma, large cell carcinoma, adenosquamous carcinoma, large cell neuroendocrine carcinoma and carcinoid carcinoma, etc., which account for 80% of all lung cancers. Most of non-small cell lung cancers other than large cell lung cancers have a slow growth speed, metastasize at a late stage, and have a better surgical effect, and their overall five-year survival rate is higher than that of small cell lung cancers. The overall five-year survival rate is higher than that of small cell lung cancer. Although small cell lung cancer is more serious and has poorer surgical results, it is more sensitive to radiotherapy, so it is recommended to seek medical treatment in time.