Okay, so just a few minutes ago a new episode came out and…
I don’t want to spoil your YouTube binging session, but I think the PT is onto something I have been trying to speculate for quite a long time.
Neck pain might be caused by stiff scalene/SCM muscles. These muscles (and others) might be contributing to loss of cervical lordosis.
What the PT states, the SCM/Scalenes might be stiff as they are overworked because of improper breathing where diaphragm is underused and rib-cage breathing is overused.
And obviously, stiff SCM and scalenes may impact IJVs and, I would say not impossible, to some extent either directly or indirectly, arterial inflow too.
And ah, the breathing is related to our posture and habits.