When reviewing lung nodules, it is recommended to choose the same department as the first time or to choose respiratory or thoracic surgery, and in some cases, other departments. The nature of pulmonary nodules is mostly caused by inflammatory lesions, but can also be caused by tumor-occupying lesions, and can also be found in certain vasculitic changes. In both respiratory and thoracic surgery, the doctor examines the lung nodules for changes by using thin layer CT of the chest and target area scanning to look for tendency to increase in size, non-smooth margins, formation of lobar disease, signs of vacuolation, vascular collectivities, and pleural traction malignancies. Smaller nodules, such as 5mm nodules, have no obvious changes on dynamic observation, and the patient can be told to continue dynamic observation. However, if the nodule has a tendency to increase in size, or if the above abnormal changes occur, it is necessary to go to the thoracic surgery department for coordinated treatment. If the nodular lesion is induced by a lung tumor, the patient should choose to hang up the oncology department. If the nodular lesions are due to connective tissue disease, patients should hang up with the rheumatology department. Patients with pulmonary nodule review are advised to go to different departments under the guidance of pre-screening triage to clarify the cause of the disease and then undergo treatment under the guidance of the doctor.