There is no such thing as which type of lung cancer is the most serious. Lung cancer is divided into small cell lung cancer and non-small cell lung cancer. Clinically, lung cancer is mainly classified into two types, including small cell lung cancer and non-small cell lung cancer. It is impossible to judge which lung cancer is the most serious by the type of lung cancer, but generally the severity of lung cancer is judged by the stage of lung cancer, general condition of the patient, and the effect of treatment. No matter which type of lung cancer a patient has, if the patient is in the early stage of lung cancer and has no metastasis of lymphocytes or other organs, it is relatively not too serious. If the lung cancer patient is in the advanced stage or has metastasis of lymphocytes or other organs, no matter what kind of lung cancer it is, it is a more serious case. Lung cancer patients need to judge the severity according to their specific conditions, which cannot be judged by the type of lung cancer. Lung cancer patients should seek medical checkup in time to find out and treat as early as possible to avoid aggravation of the condition.