Ground glass shadows and ground glass nodules are relatively more serious and have the potential to progress to malignant disease. Ground glass shadows are a manifestation of lung lesions and are most commonly seen in viral infections, such as invasion by viruses, bacteria, and other pathogens, resulting in ground glass shadows. The most common causes of ground glass shadows in the lungs are various inflammatory lung diseases, such as viral pneumonia, bacterial pneumonia, etc. The condition is usually not serious, and targeted control of the infection is sufficient. Ground-glass nodules are the development of ground-glass shadows, which may become cancerous. It may be benign disease, such as eosinophilic inflammation, Wegener’s granulomatosis, etc., or malignant disease, such as lung cancer, bronchopulmonary cancer, etc.. If the ground-glass nodules persist for a long time, they are usually a sign of focal fibrosis and early lung cancer. Regardless of the presence of ground-glass shadow or ground-glass nodules should be promptly consulted to find out the cause of the disease so as to avoid progression of the disease.