Pure ground-glass nodules are the description of nodules in the lungs by imaging, and infection, tumor, alveolar hemorrhage, etc. are mostly considered. 1. Infection: Bacterial, mycoplasma, viral, tuberculosis and other infections may cause ground-glass nodule-like changes, usually accompanied by a series of inflammatory indicators rise, but also cough, fever and other symptoms. Considering infectious diseases, CT examination can be repeated after two weeks of anti-infectious treatment to observe whether there is any change in the nodules. 2. Tumor: early tumor growth in the alveolar wall, along the alveoli to the surrounding infiltration will also cause corresponding changes, most of the early no obvious symptoms. 3. Alveolar hemorrhage: various causes lead to hemorrhage in the alveoli, because the blood spreads to the surrounding, there will be corresponding conditions. When pure ground-glass nodules are found, it is recommended that patients go to a regular hospital in time and listen to the advice of a professional doctor.