Lung nodule 5cm is no longer a nodule, to be considered as a mass, lung mass 5cm is relatively large, should attract attention, do further examination and active treatment. Lung nodules according to the size of the lesion classification, diameter <5mm belongs to the tiny nodules, diameter between 5 ~ 10mm belongs to the small nodules, when the diameter of the lung nodules more than 3cm indicates that the nodules have been relatively large, this situation is no longer belong to the nodules, belongs to the lung mass, especially vigilant is malignant mass. When a lung mass occurs, you should go to a regular hospital as soon as possible, and have a bronchoscopy, percutaneous lung puncture and other tests to further clarify the nature of the mass, in order to guide the next step in the treatment.