The severity of a 7mm ground glass nodule in the lower lobe of the right lung is related to the nature of the nodule, which is usually not serious if it is a benign lesion and serious if it is malignant. Milled glass nodules can generally be categorized into pure milled glass nodules and mixed milled glass nodules, the etiology of which can be seen in the following conditions: 1. They can be seen in interstitial fibrosis, alveolar hemorrhage, inflammation, tuberculosis, and inflammatory pseudotumor. These conditions are benign lesions and are usually not serious. 2. Lung tumor or precursor stage lesion: if the boundary of the nodule is not clear and accompanied by lobulation, burr sign, etc., or if the nodule is found to progress rapidly in a short period of time during the review, it suggests the possibility of malignant lung tumor, and it needs to be operated as early as possible to clarify the nature of the nodule. Therefore, a 7mm ground glass nodule in the lower lobe of the right lung should be taken seriously, but there is no need to be overly worried, and you can actively cooperate with your specialist to determine the treatment plan.