It's possible to have a mild form of TOS, my RSI type TOS is chronic but mild now.
I had multiple repetitive strain injuries and after many years of returning to the same work duties they became a chronic thing. I didn't know any better back then..


Can you tie these flare ups to any activity or extra stress at the time?
Any previous whiplash or upper body hits, falls, bumps?
These can get you out of alignment and set you up for musculoskeletal injuries/symptoms later on - even many yrs later.

Have you considered a evaluation by a few expert chiropractors?
Sometimes they are helpful when MDs can't see a problem- but seek out ones that are very good.
Advanced PTs would be able to do in depth evaluations also.


If you haven't found our sticky threads above the main TOS thread list {green circle Icon w arrow} do some reading in those - kind of a crash course for TOS in those.