Old pulmonary lesions indicate the presence of corresponding lesions in the lungs, which may be calcified or fibrotic, and can be caused by infectious lesions, tuberculous lesions, and traumatic lesions due to trauma or surgery, but further diagnosis of tuberculosis is required. Some patients need treatment for tuberculosis, while others do not. Therefore, it is important to go to the hospital promptly after the discovery of old lesions, so that the doctor can determine whether it is old tuberculosis or active tuberculosis. If it is old tuberculosis, no treatment is needed, but if it is active tuberculosis, treatment must be given to avoid deterioration and progression of the disease. When the disease progresses, the lesions will expand further and the patient will develop symptoms, such as coughing, coughing up sputum, hemoptysis, and fever. In addition, cavities will form, allowing the disease to spread further. If the treatment is not effective or timely, the lesions can spread beyond the lungs.