Just guessing at this but something must be causing the tightness to return or move, and it hasn't been found yet or fully resolved.

you may have developed habits of use or sitting from when the other side was tight and now that part changed so the tightness migrated .

I think tightness kind of creeps up on us, at least for me it does, or we try to ignore it until it puts a crimp in our life..or we just deal with it until it stops us.

If you find a muscle that is normal {a leg muscle?} then feel the tight muscles around you neck & back to see if there is a difference.
I think it is kind of hard to feel it on ourselves.


If you have trigger points, they need to be fully released before the muscle can fully relax. like a knot in a length of rope - causes problems