Pulmonary fibrosis foci do not necessarily result from tuberculosis, although tuberculosis is a relatively common cause of such fibrosis. After tuberculosis is cured, pulmonary fibrosis foci may remain. However, in cases of general pulmonary inflammation, sometimes the lesion is not completely absorbed, which may also result in fibrosis. If the pulmonary fibrosis foci are a result of tuberculosis, there is a certain risk of recurrence. In such cases, measures should be taken to prevent recurrence, such as ensuring balanced nutrition and engaging in appropriate exercise to enhance one's resistance. These measures help prevent the recurrence of tuberculosis. Additionally, pulmonary fibrosis foci can also lead to changes in lung structure, making patients relatively more susceptible to respiratory infections. Therefore, for pulmonary fibrosis foci, it is also important to keep warm and prevent respiratory infections.