Is diffuse fibrosis in both lungs severe?

Scattered fibrotic foci in both lungs are generally not serious. Such findings commonly occur after the resolution of conditions like pneumonia or tuberculosis, leaving benign scars in the lung tissue; some cases may present as organizing pneumonia. Pulmonary fibrosis without clinical symptoms usually does not affect daily life and does not require specific treatment.

Pulmonary fibrosis refers to the scarring of lung tissue, primarily caused by chemical or physical injury to cells, which triggers the secretion of collagen proteins to repair interstitial lung tissue, ultimately leading to lung fibrosis. Clinically, the initial symptom is typically shortness of breath during intense physical activity. As pulmonary fibrosis progresses, dyspnea may even occur at rest. Patients with severe disease can develop progressive shortness of breath, along with other symptoms such as dry cough, fatigue, clubbing of fingers, and cyanosis. Severe fibrosis may alter normal lung architecture and lead to loss of function. When extensive fibrotic tissue replaces alveoli and eliminates gas exchange capacity, oxygen cannot enter the bloodstream effectively, resulting in breathing difficulties, hypoxia, acidosis, loss of work capacity, and potentially death in severe cases.

However, in the majority of individuals undergoing chest CT scans—especially high-resolution CT—scattered fibrotic changes in both lungs are commonly detected incidentally. Therefore, if patients have no clinical symptoms, regular follow-up chest CT scans are sufficient. For patients with significant fibrosis, further evaluation is necessary to identify the underlying cause, followed by active treatment to prevent lung function deterioration and complications such as respiratory failure.