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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 obstructive pulmonary disease (COPD) is a long-term lung disease. Itâs comprised of two diseases: emphysema and chronic bronchitis. A long-term cough is often the telltale symptom of COPD. There are also other symptoms that can occur as lung damage progresses. Many of these symptoms can also be slow to develop.