Inhalation of dusts or toxins |
Mineral dusts - asbestos, silica, iron oxide, aluminum oxide, talc, mica, and coal |
Toxins - NO2, sulfur dioxide, ammonia, chlorine, and phosgene |
Drug reaction |
Infection - viral, mycoplasma |
Connective tissue disease, especially rheumatoid arthritis |
Chronic rejection in heart-lung, lung, and bone marrow transplant recipients |
Hypersensitivity reactions |
Ulcerative colitis |
Idiopathic |
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