Early stage lung cancer does not have obvious signs and therefore one cannot determine whether one has lung cancer based on the so-called 15 signs. The main symptoms of advanced lung cancer are cough, hemoptysis, chest tightness, shortness of breath, chest and back pain, weight loss without obvious reasons, reduced diet, occasional leg pain and swelling of head and face. These symptoms are not easily distinguished from tuberculosis, lung inflammation, bronchitis, etc. Therefore, if lung cancer needs to be detected, a chest CT should be performed to check whether there is a lung mass. If there is a lump, lung aspiration or bronchoscopy should be performed to further clarify the pathology to see if it is lung cancer. Therefore, for those who suspect lung cancer, they need to go to the hospital for examination rather than judging by themselves based on symptoms.