At 47 I was diagnosed with emphysema though I knew I hadn't smoked "enough". Last year at 59 I was finally diagnosed with Alpha-1 Antitrypsin Deficiency, a very rare but very bad genetic disorder. I'm putting this out there so anyone who has been diagnosed with emphysema "too young" (under 50) will get tested. I also had terrible irritable bowel syndrome in my thirties which is another one of a multitude of symptoms . Had I been diagnosed earlier I could have been receiving the treatment which is probably now too late to save my life. Just sayin'. If your doc won't do it you can contact the Alpha-1 Antitrypsin Deficiency agency online and request a test. I lost twelve years of treatment because my doc didn't test me at 47. Don't let that happen to you. There's oodles of info online. Good luck and may you be negative!