The effect of fibrotic foci on the lungs depends on the extent of their involvement; if they are small, they have essentially no effect on lung function; if they are extensive, they may lead to decreased lung function. Most fibrotic foci in the lungs are due to fibrotic lesions that remain after healing of a lung infection. If the fibrotic foci are relatively small in extent, they usually have no obvious symptoms and have no special effect on lung function. If the fibrotic foci are more extensive, they may lead to pulmonary hypoplasia, with serious manifestations such as hypoxia and even dyspnea. Fibrotic foci may also be idiopathic pulmonary fibrosis, an interstitial lesion of the lungs, with a slow onset, not easy to detect, and the main symptoms of a dry cough and progressive respiration may affect the lung function, which needs to be combined with glucocorticosteroids, methotrexate, oxygen therapy and other comprehensive treatments. Therefore, when the examination report suggests that there are fibrous foci in the lungs, you should ask your doctor in time to assess your condition and then proceed to the next step of treatment under your doctor’s guidance.