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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.
Chronic bronchitis, emphysema, asthma, and infectious diseases can contribute to the development of chronic obstructive pulmonary disease. Symptoms of chronic obstructive pulmonary disease include. cough, chest discomfort, shortness of breath, and; wheezing. Progressive or more serious symptoms may include. respiratory distress, tachypnea, cyanosis,