Pulmonary fibrosis. Thickening and scarring of the lungs, specifically of the interstitium (the area in and around the small blood vessels and air sacs where the exchange of oxygen and carbon dioxide takes place). This leads to a decline in the ability of the lungs to extract oxygen from the air.
Sarcoidosis. An inflammatory disease that is characterized by granulomas (tiny lumps of immune cells) that can grow and clump together in organs, affecting how these organs function. Sarcoidosis usually starts in the lungs or lymph nodes, but it may eventually affect other organs. Besides the lungs and lymph nodes, the most commonly affected organs are the skin, eyes, and liver. The course of the disease varies greatly, from a mild condition that gradually gets better on its own to a severe and progressive disease that causes permanent damage to organs. There is no known cause and no known way to prevent sarcoidosis.