Bilateral lung nodules may be caused by pneumonia, misshapen tumors, sarcoidosis, or lung cancer, and ground-glass density shadows can be seen in diseases such as pneumonia, pulmonary edema, and lung adenocarcinoma. Lung nodules are masses <3cm in the lungs. Double lung nodules are nodules in both the left and right lungs, which may be caused by benign diseases such as pneumonia, misshapen tumors, sarcoidosis, rheumatoid nodules, etc., or malignant tumors such as bronchopulmonary carcinoma and metastatic carcinoma of the lungs. Milled glass density shadow refers to a cloudy slightly dense shadow on chest CT, which can be divided into diffuse and limited. Diffuse ground-glass density shadow can be seen in the early stage of pneumonia, pulmonary edema, alveolar protein deposition and other diseases. Restricted ground-glass density shadow, i.e., ground-glass nodule, is a kind of lung nodule, which may be caused by benign diseases such as pneumonia, focal hemorrhage, or lung adenocarcinoma. Nodules in both lungs and ground-glass density shadows suggest that pneumonia and other lung diseases may be present. It is recommended that the patient consult a specialist, combine the results of tumor markers, blood tests and other tests to comprehensively determine the possible causes of the disease and follow the doctor's instructions for treatment.