Signs of recurrence of old tuberculosis mainly manifest as fever, cough, weight loss and other symptoms, and should also be combined with auxiliary examination to confirm the diagnosis. 1. Fever: In the recurrence of old tuberculosis, there may be recurrent fever, low-grade fever, night sweats and fatigue. 2. Cough: There may be a cough, dry cough or a small amount of sticky sputum, and some patients may have hemoptysis and other symptoms. 3. Weight loss: recurrence of old tuberculosis may cause weight loss. 4. Auxiliary examination: If the above symptoms occur, you can go to the hospital for sputum smear examination, lung CT and other auxiliary examinations to determine whether the recurrence of tuberculosis. If you have any discomfort, you should consult a doctor in time and follow the doctor’s instructions.