Multiple small translucent shadows in both lungs are usually caused by increased gas, which may be due to intrapulmonary cavities, bronchiectasis, emphysema and other causes. 1. Intrapulmonary cavitation: on imaging, it is manifested as internal translucent shadows in the lungs, mostly caused by pathogens with chronic infections, and tuberculosis is the most common cause of chronic cavitation. It can also be caused by primary lung malignant tumor, autoimmune disease, etc. Further examination is needed to confirm the diagnosis. 2. Bronchial dilatation: the dilated bronchial tubes are shown as ring-shaped or thick-walled ring-shaped translucent shadow on the image, and the most typical sign will appear the sign of seal, which is usually combined with infection, cough, cough sputum, hemoptysis and other symptoms. 3. Emphysema: Emphysema is divided into lobular central emphysema and total lobular emphysema. Lobular central emphysema can be manifested as focal, rounded translucent areas, usually without cystic walls; total lobular emphysema is manifested as an increase in the overall translucency of the lungs. There may be other causes of multiple small translucent shadows in both lungs. Further tests should be done to clarify the cause of the disease and treatment should be carried out under the guidance of a doctor.