How long a 30-year-old patient with pulmonary fibrotic foci can live cannot be generalized, and is related to the extent of the fibrotic foci. If the fibrotic foci are small in extent, they have basically no effect on the body and will not affect life expectancy, while if they are wide in extent, they may lead to reduced lung function, hypoxia, respiratory distress, and other symptoms, and may even be life-threatening. Generally speaking, the fibrous foci in the lungs are often fibrotic foci left behind by the body’s repair after a lung infection has healed naturally. There are many causes of fibrotic foci in the lungs, including systemic lupus erythematosus, rheumatoid arthritis, silicosis, asbestosis, idiopathic pulmonary fibrosis, acute interstitial pneumonitis, inhalation of inorganic dust, inhalation of organic particles, and so on. When the examination report suggests the presence of fibrotic foci in the lungs, it is recommended to consult a doctor in time for appropriate treatment according to the size of the fibrotic foci in the lungs, pulmonary function tests and the cause of the disease.