lately i have been having some breathing issues and not sure why. a friend of mine told me today (who has had r/a since she was 13) that she saw a pulmonary dr today and what she thought was copd is really stiff lung and it was caused from taking methotrexate and r/a and now that really makes me worry because breathing has become an issue with me.i have never heard of this and i know r/a can affect the lining of the lung, so if anyone out there has heard anything about this, your knowledge would be appreciated. i have left this open for discussion so reply as much as you would like. thanks alot guys