Multiple fibrosis in both lungs is a description of the pathologic pattern found on lung imaging. It is most often a fibrotic lesion remaining after the healing of a lung infection, but can also be seen in fibrotic foci caused by other diseases. 1. After lung infection or injury, lung fibroblasts will proliferate and secrete collagen, eventually forming fibrous foci. For example, single, limited fibrotic foci caused by Mycobacterium tuberculosis infection are mostly stable lesions without activity, so they do not need treatment and can be observed with regular follow-up. 2. Other diseases, such as interstitial lung disease, some harmful physical and chemical factors, or connective tissue disease, pathogenic microbial infections, etc., leading to diffuse damage to the interstitium between the alveoli, after the damage to the interstitium of the lungs will appear fibrosis repair, fibrosis of the interstitium of the lungs will affect the function of the alveolar air exchange. Patients may manifest symptoms such as dyspnea, low oxygen saturation, and cyanosis of the lips, etc. It is necessary to clarify the primary cause of the disease and actively treat it against the primary disease. Multiple fibrous foci in both lungs can also be seen in other diseases, and it is recommended that patients go to regular hospitals in a timely manner in order to avoid delaying the condition.