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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. 0. 9. Idiopathic pulmonary fibrosis is a serious disease where the tiny air sacs of the lungs (the alveoli) and the lung tissue next to the alveoli become damaged and scarred. The main symptom is shortness of breath that gradually gets worse.The exact cause is not known.. 0. 9. Idiopathic pulmonary fibrosis is a serious disease where the tiny air sacs of the lungs (the alveoli) and the lung tissue next to the alveoli become damaged and scarred. The main symptom is shortness of breath that gradually gets worse.