There is no clinical diagnosis of obsolete pneumonia. The common obsolete lesion of the lung is an imaging manifestation that can be seen as an obsolete cord-like shadow of the lung during a lung CT. The common cause is previous tuberculosis, chronic lung disease, or pneumonia, which is a lesion left over from curing it, and usually requires no interventional treatment. Patients do not have obvious symptoms and many times are found during a physical examination of the patient. If the patient has previous chronic lung disease, it is important to take care of the cold and avoid colds in general. Patients with asthma should avoid exposure to irritating odors to avoid causing asthma attacks and should quit smoking to avoid repeated lung infections that can affect the function of the lungs. Patients should exercise properly, live a regular life and eat reasonably. They can do exercises such as swimming and breathing exercises to enhance the breathing function of the lungs.