If a chest radiograph is taken after recovery from tuberculosis, if it suggests tuberculosis again, it needs to be clarified whether it is a recurrence or a residual lesion left over from previous tuberculosis cure. Tuberculosis shows pleomorphic changes such as plaques, exudates, proliferations, nodules, calcifications, and cavity formation. If there is associated destruction of the lung, it is long-standing old TB. If accompanied by calcification, they are also lifelong imaging changes. A CT chest examination at any time can indicate old TB, but it is not infectious and does not require treatment. In the case of new-onset TB, CT can suggest plaques, exudates, and bronchial dissemination. Significant abnormal changes in imaging, biochemical examination can suggest increased blood sedimentation, and clinical symptoms of tuberculosis toxicity such as cough, sputum, hot flashes, night sweats, and even blood in sputum can be identified. In conclusion, if a chest X-ray indicates TB again after healing from TB, CT and fiberoptic bronchoscopy should be performed to clarify whether it is old TB changes or new TB changes.