Patients with lung cancer tumors that are larger or growing more obviously can be seen during the radiographs. For most of the early stage lung cancers or lung cancers with more hidden growth sites, they cannot be seen on the film. For lung cancer, the most common method of examination should be lung CT, which can detect nodules less than 1 cm above the lung, even including more early lung cancer, and is important for the diagnosis of lung cancer. Therefore, it is important to note that one cannot determine whether a patient has lung cancer by the method of taking a film, which can easily delay the disease and delay the patient’s treatment, resulting in adverse consequences.