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Pulmonary fibrosis. Overview. Pulmonary fibrosis Pulmonary fibrosis scars and thickens the tissue around and between the air sacs (alveoli) in your lungs, as shown on the right. A normal lung with normal alveoli is shown on the left. Pulmonary fibrosis is a lung disease that occurs when lung tissue becomes damaged and scarred. This thickened, stiff tissue makes it more difficult for your lungs to work properly. As pulmonary fibrosis worsens, you become progressively more short of breath. The scarring associated with pulmonary fibrosis can be caused by a multitude of factors.
References. View image. Pulmonary fibrosis is a lung disease. The air sacs of the lungs get inflamed and are gradually replaced by scar tissue. (The air sacs are called the alveoli.) As the disease worsens, the scar tissue gets thicker and makes it harder to breathe.ulmonary fibrosis may be hereditary. There are 2 ways you can get the disease because of genes you inherited from your parents: 1  You inherit the disease and symptoms show up later in life, usually in the forties or fifties.