Hey guys..reading Lisa's story about her scare, I was wondering how many of you all have had a lung collapse? Also can you do anything to prevent it or does it just happen? What causes it? If your PFT's are in top shape and if you do plenty of cardio to build up your lungs, it can still happen..right?? I'm just being curious. I hate how sometimes no matter how hard you fight to train your body to be the best it can be, CF can take control! Ugh! Hugs to all!