Multiple small nodules in both lungs are usually not serious, the most common cause is lung infection, but also may be old lesions, tuberculosis, pulmonary nodular disease, etc. A very small percentage of patients are malignant tumors of the lung, for example, some nodules appear lobulated, burr, or have signs of malignancy such as vascular signs, vacuolar signs, etc., can not exclude malignant tumors of the lung, which may require surgery for removal at this time. In this case, there is no need for radiotherapy or chemotherapy even after resection, and the prognosis is better. The most common cause of multiple small nodules in both lungs is lung infection, and the lung CT should be reviewed after two weeks of anti-infection. If there is still no change, the lung CT will be repeated at six months, and if there is still no change, the lung CT will be followed up under the guidance of the doctor.