Ling, what I have found in life is that asking the “why” of anything will just make me crazy, so I research everything. I guess it comes down to genetics, body type, environment, and probably diet- the greatest being genetics and body type. I say that because my brother and I had the same parents but grew up in different environments after age seventeen, and his economic status was way better than mine - yet we have ended up sharing similar but not identical illnesses. What I also discovered that I did not know was the down side of steroid inhalers and steroids of any kind which is that they increase your risk of getting infections. Thank you Rick for that valuable piece of information and article. The side effect of my eyes going wonky everyday didn’t hurt Ling . It was just annoying for a bit of time so I couldn’t drive or read till it passed. I was ok with that. The fact that you don’t have side effects is a good and wonderful thing! ( irene5)