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Rheumatoid arthritis is an inflammatory condition that most often involves the articulations of the hands, fingers, and shoulder but can affect any joint of the body. Pulmonary fibrosis is a lung disease that is initiated by chronic inflammation in the lung tissue. Rhuematoid arthritis has been studied for decades. It is one of a few autoimmune diseases. In these disease states, the body literally attacks it self due to an unknown cause. Auto immune diseases like RA and multiple sclerosis have what the medical community calls an idiopathic etiology. In other words, despite years of research, we still do not know the under lying cause of these diseases. Further, we do not know why they affect some people and not others.
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