There are many possible causes for multiple small nodules in the upper lobes of both lungs, such as inflammatory nodules and pulmonary nodular disease are benign nodules, which are usually not serious. If they are lung cancer or lung metastases, they are more serious. 1. Inflammatory nodules: all kinds of pathogenic infections may cause local exudation of lung tissue to form multiple nodular shadows, especially viral pneumonia is common. Most of the exudative nodules can be absorbed after anti-infection treatment. 2. Lung nodular disease: Lung nodular disease is a chronic granulomatous disease that occurs in the lungs and lymph nodes. Many patients with pulmonary nodular disease can remain stable for a long time and have no obvious symptoms, so they do not need special treatment. If symptoms such as dyspnea are present, maintenance therapy with glucocorticoids or immunosuppressants is required. A small number of patients may develop severe pulmonary fibrosis, which may affect the prognosis. 3. Lung cancer: single malignant lung nodules are mostly in the early stage of carcinoma in situ or lung cancer, and most patients have a good prognosis after surgical resection. If there are multiple malignant nodules in both lungs, it indicates that the lung cancer has already metastasized in the lungs or even to the opposite side of the lungs, which is a manifestation of the progress of the disease, and the patient may have already been in the middle or late stage of the cancer, which is a more serious condition. 4. Lung metastasis: many malignant tumors in other parts of the body can be transferred to the lungs through the blood channels, forming multiple nodules in both lungs. The appearance of lung metastasis indicates that the patient is already in the advanced stage of cancer, and most patients have poor prognosis and very serious condition. It is recommended to go to the hospital as soon as possible to get a clear picture of the nature of the nodules and then treat them accordingly.