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What causes pulmonary fibrosis?

Pinpointing the cause an individual case of PF can be challenging. Known causes include: occupational exposures to asbestos and inorganic dusts, organic compounds (mold, bacteria…) some medications, autoimmune diseases such as scleroderma or rheumatoid arthritis, chemo or radiation therapy. Smoking is not a cause, but it is a known risk factor. Often, there is no identifiable cause.