The need for treatment of ground glass nodules found in the lungs is determined by the size and nature of the nodule. There are 3 types of pulmonary nodules: ground glass nodules, partially solid nodules and solid nodules. If the ground glass nodule is smaller than 5 mm, it is mostly a benign chronic inflammatory nodule. If there is no clinical symptom, no treatment is needed, and dynamic follow-up of chest high-resolution CT once a year is sufficient. If the ground glass nodule is between 6-8 mm or even larger than 8 mm, with changes such as short burr, lobulated, pleural traction sign, pleural depression sign, etc., it is necessary to be alert to the possibility of early lung cancer in this ground glass nodule. Further enhanced CT examination of the chest and percutaneous lung aspiration cytologic biopsy should be given if necessary. If the diagnosis of early lung cancer is confirmed, a thoracic surgeon can be asked to perform surgery to remove the lesion at an early stage to avoid any missed diagnosis or misdiagnosis.