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Pulmonary fibrosis. Overview. Pulmonary fibrosis Pulmonary fibrosis scars and thickens the tissue around and between the air sacs (alveoli) in your lungs, as shown on the right. A normal lung with normal alveoli is shown on the left. Pulmonary fibrosis is a lung disease that occurs when lung tissue becomes damaged and scarred. This thickened, stiff tissue makes it more difficult for your lungs to work properly. As pulmonary fibrosis worsens, you become progressively more short of breath. The scarring associated with pulmonary fibrosis can be caused by a multitude of factors.
Pulmonary fibrosis definition and facts. 1  Pulmonary fibrosis refers to scarring of the lung tissue (fibrosis of the lungs). 2  Symptoms of pulmonary fibrosis include: Cough. Shortness of breath or difficulty breathing. 3  The most common type of pulmonary fibrosis is called idiopathic pulmonary fibrosis; its cause is not understood.