Patients with old tuberculosis need to pay attention to: first, quit smoking, as smoking can lead to a decrease in immune function and lung function. Secondly, it is important to review the lung CT regularly to watch for signs of recurrence. Finally, patients with old tuberculosis should observe the clinical symptoms, and when they have coughing and coughing fever after getting cold, they should actively seek medical attention and improve the relevant examination to consider whether the infection is combined, such as bacterial infection, viral infection or infection by atypical pathogenic bacteria. For example, bacterial infections need to be treated with antibiotics, commonly used antibiotics include cefixime, azithromycin, roxithromycin, etc.