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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.
A pulmonary embolism, a blood clot lodged in the lung, causes shortness of breath, chest pain, and more. Pulmonary fibrosis is a serious chronic lung condition where the lungs become scarred and stiff. Tuberculosis usually infects the lungs, causing a bad cough with blood, chest pain, fever, chills, and fatigue.