Upper Back pain

The only way we found out that Nate is still having breathing issues is when our new doctor asked him to take a breath and blow it out as hard as he could.
He didn’t do too well getting a lot of air in his lungs.
He had Asthma when he was little as do I still and its hard to get the air back out when you do.
Nate had a hard time getting his lungs full and blowing out very hard.
The doc says that makes your upper back hurt.
I from experience know that when I have a problem breathing, my upper back goes into spasms.
It all makes sense to me.
Our doc has Nate taking Soma for the spasms.
He says it helps sometimes, not other times.