At 23 years of age, ground-glass nodules may be benign lesions such as inflammation and fungal infections, or they may be seen in early-stage lung cancer. It is important to note that there is no clinical evidence of a complete correlation between ground glass nodules and age. 1. Benign lesions: such as viral, bacterial and fungal infections in the lungs, which can cause localized lesions in the lungs, manifesting as limited nodular shadows in the lungs. It can also be seen in old lung lesions, which manifest as nodular shadow after the disease is cured. 2. Early lung cancer: For example, early lung adenocarcinoma can be manifested as ground-glass-like changes, with relatively low density, blurred boundary, and some of them may have burr sign. It is recommended that patients should go to the hospital in time and listen to the professional doctor’s advice if they find ground-glass nodules.