Small cell lung cancer without any symptoms may be due to the fact that the tumor has not invaded the surrounding organs for the time being. Generally, some early stage patients have no obvious symptoms, and common symptoms include coughing, coughing up sputum and hemoptysis. Small cell lung cancer is a common type of lung cancer. Usually, small cell lung cancer without any symptoms is considered to be in the early stage of the disease, which means that the tumor cells have not invaded the surrounding organs of the lungs yet, so it can only be detected through chest imaging and histopathological examination. Secondly, according to relevant surveys, about 5%~15% of small cell lung cancer patients may have no symptoms in the early stage, but some of them may have cough, sputum, hemoptysis and other symptoms in the early stage. All in all, when patients are examined and found to have lung cancer, they need to cooperate with doctors to carry out standardized treatment in time, so as to avoid delaying their condition.