Milled glass nodules in the lungs are dense shadows with clear or unclear boundaries in the lungs. It may be malignant tumors or benign lesions, or it may be caused by inflammation, etc. Further examination should be done to determine the details, which are analyzed as follows: 1. If the ground-glass nodule is large, more than 8 mm, with unclear borders, and accompanied by lobulated and burr-like conditions, it is considered that there is a malignant lung tumor, and the patient’s prognosis is poor, and it is recommended that the patient should be actively treated. 2. If the diameter of ground-glass nodule in lung is shorter than 5mm, with clear boundary, it is mostly considered as benign tumor, usually benign tumors have a better prognosis after surgery by taking medication as prescribed by doctors and regular checkups. 3. Inflammation caused by bacterial infection, allergy, vasculitis, etc. is not serious if treated actively, and such diseases can be controlled and cured by systematic treatment under the current medical level. It is recommended to go to a regular hospital for timely consultation and follow up or treatment as prescribed by the doctor.