Old tuberculosis usually has no clinical symptoms corresponding to tuberculosis and is only detected on examination. Usually, when old tuberculosis is examined on chest imaging, there are striated lesions, calcified lesions, sclerotic lesions, pleural thickening, purified cavities, etc., and some of the patients may have adhesion or calcification, which is inactive tuberculosis and is not contagious. And patients can be positive in PPD skin test, Y-interferon release test and other laboratory tests. If the patient develops complications such as COPD, he or she may experience chronic cough, sputum, shortness of breath, and may be accompanied by dyspnea, chest tightness, and wheezing. Patients need to undergo regular X-ray and sputum examination under the guidance of a doctor, strengthen their nutritional intake, pay more attention to rest, and actively treat lung diseases and diabetes to avoid the recurrence of tuberculosis. Patients are advised to distinguish between pulmonary tuberculosis and old tuberculosis under the guidance of the doctor, and if necessary, relevant treatments should also be carried out.