My daughter broke out in a rash about 24hrs before an asthma flare!
I was searching the internet for my cousin on this very topic. She has the exact same thing - intense itching on her right side around the waist area - right before she gets an asthma attack. So, even though no one has answered your question, it is nice to know that she's not the only one.
For those who get the itch, we should consider ourselves lucky. At least for me, if I puff on the inhaler when I have the itch, I am able to stop the attack from coming. This forum is awesome because it helps us realize that we're not the only one with some weird symptoms. I'm happy that I have that warning signal.
I have chronic asthma , and i always have a itch on my hand while and before and after a serious asthma attack. i don't know if theres something behind it , or if its just me. but i had this same question a while back. i got no serious responses