Thank you for asking and answering this. I have sarcoidosis and asthma and Colorado was awful for me not to mention the Grand Canyon.

AllergyKid2006- Thank you for sharing! I went hiking a few years ago and I'm so thankful I had my inhaler with me! I used it a few times.

This info came too late for me, but I am so glad to get info for another time. I was not in good shape and didn't realize it, etc, etc. I had my first ever actual asthma attack in 25+ years as a result. Fortunately it occurred the day after I arrived home, and I was able to be treated by my own providers.

Forgot to mention that I also have Sarcoidosis.

Gerry - happy to hear you were home when it happened and are okay! High altitudes can be so deceiving, I know I always underestimate how it'll effect me.