Chronic infection in both lungs suggests that there are foci of infection in both lungs and that the infection has been present for a longer period of time, that is, there are proliferative lesions present in the lungs, such as fibrous streak shadows and denser shadows, which suggest a chronic infection. The shadows of acute infection appear as ground glass, thin, lamellar shadows. Chronic infection of both lungs suggests that the current infection is not necessarily symptomatic, such as cough, sputum, or fever, or it can be a fibrous streak shadow left by poor absorption of the original infection, which can now be without any respiratory symptoms. If a chest radiograph reveals chronic infection in both lungs, a chest CT should be done to further exclude other lung diseases. If the patient has no obvious respiratory symptoms, and only suggests chronic infection in both lungs, clinical observation and dynamic review can be done.