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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.
1 If the inflammation of the interstitial tissue leads to scarring over time, the term interstitial fibrosis is used to describe the condition. 2  If the cause is not known, the condition is termed idiopathic pulmonary fibrosis. 3  Symptoms of interstitial lung disease include: 4  shortness of breath, and. 5  a dry cough.