Generally there is no such thing as an old lung infection, it should be an old lung lesion. Lung old lesions for inflammation or tuberculosis foci incomplete absorption, or foci have been completely absorbed to leave traces of infection; if there are no symptoms and treatment, more likely to have contact with infectious agents, and their own body resistance is strong, although the disease has been cured, but in the case of unnoticed lungs to leave a shadow. Lung stale lesions are found in the lungs when the patient undergoes chest X-ray or chest CT examination, and the report card shows stale lesions in the lungs. If the lesions are widespread or accompanied by other symptoms that may affect respiratory function, it is recommended to visit a hospital for further treatment. Old foci should keep exercising every day to promote blood circulation, improve the immune ability of the body, and keep away from viruses and inflammatory infections to prevent aggravation of the disease. If there is an acute attack, anti-inflammatory and anti-infectious drugs (such as amoxicillin, moxifloxacin, etc.) can be used as prescribed by the doctor. People with symptoms associated with old lung lesions are advised to consult a doctor in a timely manner and take active treatment under the doctor’s guidance to avoid delaying the condition.