I would only have color changes when my hands/arms were in a position that stopped the blood flow {white hands} and then when i returned to a blood flow positions { pink/red hands}.

I would have cold hands and swelling hands/fingers that had no relationship to hand/arm positions

for me part of the testing in regards to the symptoms being from the c spine or TOS { I have minor stuff at C4/5/6 = MRI & x rays}

The 2 PTs { 2 different places} did c spine positional testing that included some specific traction and compression maneuvers with tilting, turning etc - basically trying to reproduce some or any symptoms.
nothing changed - no pain or symptoms increased or decreased with those maneuvers - so that showed c spine was not the cause of my symptoms.

the change in the proper neck curves is probably an issue for most of us - part of the postural/ergonomic/uses relationship

Why it's so important to address all aspects - the whole picture - for life.
pain control
uses
posture/bodywork/alignment
ergonomics
stress/relaxation/breathing
water/fluids to keep tissues hydrated so they don't get sticky {adhesions}
nutritional/supplements

well this is just my list off the top of my head...