The severity of pulmonary hairy glass nodules depends on the size and shape of the nodule, as follows: 1. More serious: If the pulmonary hairy glass nodule is larger than 8mm and accompanied by vascular sign, vacuolar sign, pleural depression sign or accompanied by lobar burr, it is more serious and the possibility of pulmonary malignancy is higher. 2. Less serious: If the pulmonary hairy glass nodule is smoother and the density is more uniform and smaller. If the diameter is less than 8mm, inflammation of the lung is more likely, but of course it may be tuberculosis, pulmonary nodular disease or old lesions, etc. If inflammation of the lung is considered, the first step is to fight the infection for two weeks and then review it again in three months if there is still no change. If there is still no change, the review will be done after six months. If there is still no change after six months, the review should be conducted regularly under the guidance of the doctor. If the nodules become larger, or the density becomes uneven, or the mentioned pleural depression sign, lobar burr, vascular sign, vacuole sign, etc. appear during the review, the possibility of malignant tumor in the lung is higher, and further examination is necessary for early diagnosis and early treatment.