Pulmonary ground glass nodules include benign and malignant lesions, not necessarily all of which are carcinogenic, and should be analyzed on a case-by-case basis and not be generalized. The pathological changes of ground glass nodules are the decrease of gas in alveoli and the increase of cell number, which cause the proliferation of alveolar epithelial cells, the thickening of alveolar septum and the partial filling of fluid in the terminal air sacs, but the alveoli have not been completely collapsed. Clinical lung CT suggests ground glass nodules, further enhanced CT examination, puncture biopsy pathology examination and other related examinations are recommended to clarify the benignity and malignancy of the lung nodules and to formulate a treatment plan as early as possible. Systemic examination is also needed because ground glass nodules may be pulmonary adenocarcinoma or pulmonary metastases to clarify whether they are primary or secondary tumors and to prevent missed and misdiagnosis. Benign lesions of pulmonary ground glass nodules are seen as focal fibrosis, inflammation and hemorrhage, etc. They may disappear within a short period of review, but if they persist they need to be kept away from pollution, actively clear the lungs and drain sputum, and be reviewed regularly. Patients with pulmonary ground glass nodules are advised to seek treatment at the respiratory medicine department of a regular hospital in a timely manner and have them removed if necessary.