Secondary TB may cause back discomfort. Secondary TB means that after the primary TB infection has been treated for a period of time, the TB bacteria in the old lesions will start the Mycobacterium tuberculosis bacteria again leading to the reoccurrence of TB. Secondary tuberculosis is common in adults, and the clinical manifestations mainly include low-grade fever in the afternoon, cough, sputum, dyspnea, and other symptoms. In severe cases, the tuberculosis lesion may invade the pleura and lead to chest infections and chest pain or even pain radiating to the back. The prognosis of secondary tuberculosis is poorer than that of primary tuberculosis. If secondary tuberculosis is suspected and back discomfort is present, it is recommended to go to the internal medicine department of the hospital for further examination to clarify the cause of the disease. Secondary tuberculosis can cause back discomfort. However, there are many causes of back pain. If you have had tuberculosis before and have a cough, low-grade fever and back discomfort, we recommend that you go to the internal medicine department of the hospital for further examination to determine the cause of the back pain, and then treat the cause of the back pain.