The severity of multiple vesicular density shadows in the lungs needs to be considered in the context of the etiology and clinical manifestations. Multiple vesicular density shadows in the lungs, the possible causes are localized lung cysts, emphysema, bronchiectasis, specific infections, tumors and other conditions. If lung cysts are considered, they may be asymptomatic and do not require special treatment, and can be treated symptomatically after pneumothorax occurs, which is usually not too serious. If emphysema, bronchiectasis, special infections (e.g. parasitic infections) are considered, they are relatively more serious, and the patient may experience respiratory symptoms such as coughing, coughing up sputum, dyspnea, etc., and require active specialist treatment. If lung tumors and metastases are considered, it is necessary to continue to improve the relevant examination tests to clarify the cause of the disease and make further treatment, otherwise it may lead to serious consequences.