The severity of scattered small nodules in both lungs depends largely on whether the nodules are malignant or benign in nature and the extent of damage to the lung tissue. Generally, clinically, they are most commonly due to inflammatory reactions in the lungs themselves, including inflammation of the lungs caused by pathogens such as Mycobacterium tuberculosis, Staphylococcus aureus, Streptococcus pneumoniae, Klebsiella, Pseudomonas aeruginosa, and Leptospira, with varying degrees of fibrosis and calcified lesions. Usually, targeted anti-pathogen therapy can be administered and complete improvement can be achieved, which is not serious. Very few of the small nodules are malignant lesions, belonging to primary bronchopulmonary carcinoma, alveolar cell carcinoma, and also seen in extra-pulmonary tumors, such as bone cancer metastasizing to the lungs. At this point, these cancerous nodules are very serious diseases and require early surgical treatment, supplemented by other comprehensive measures such as radiotherapy and chemotherapy, in order to achieve a cure.