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Interstitial lung disease may be caused by long-term exposure to hazardous materials, such as asbestos or coal dust. Or, it can be caused by an autoimmune disease, such as rheumatoid arthritis. Once lung scarring occurs, it's generally irreversible. Symptoms include a dry cough and shortness of breath that can occur either at rest or after exertion. Treatment depends on the underlying cause but often includes steroids.
