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1 Pulmonary fibrosis refers to scarring of the lung tissue (fibrosis of the lungs). 2  Symptoms of pulmonary fibrosis include. 3  cough, 4  shortness of breath or difficulty breathing, and. 5  decreased exercise tolerance. 6  The most common type of pulmonary fibrosis is called idiopathic pulmonary fibrosis; its cause is not understood.
Pulmonary fibrosis definition and facts. Pulmonary fibrosis refers to scarring of the lung tissue (fibrosis of the lungs). The most common type of pulmonary fibrosis is called idiopathic pulmonary fibrosis; its cause is not understood. A number of different medical conditions can also cause pulmonary fibrosis.