The easiest way to determine lung cancer does not exist. Confirming a diagnosis of lung cancer requires a combination of patient symptoms combined with imaging tests and pathology biopsies. Early stage lung cancer patients do not have obvious symptoms. As the disease progresses, patients may have chest pain, cough, hemoptysis, dyspnea and other symptoms; patients need to improve X-ray, CT or magnetic resonance imaging (MRI) examinations; if occupancy is found in the lungs, histopathological biopsy of the lesion site is the gold standard for confirming the diagnosis of lung cancer. Finally, the doctor will make a comprehensive judgment based on the examination results and the individual’s physical quality and give the patient individualized treatment. Therefore, there is no simple way to judge lung cancer. To prevent lung cancer, one should develop good living habits, have regular medical checkups, and go to regular hospitals in time if one is not in good health.