Neck muscle problems sometimes show up as sinus issues. All the muscles of the head are tightly linked in crazy feedback loops. For example, there's a muscle at

Neck muscle problems sometimes show up as sinus issues. All the muscles of the head are tightly linked in crazy feedback loops. For example, there's a muscle at the base of the back of your neck called the suboccipital that is linked to your eyeballs. You can feel it flex and move when you move your eyes around! That's totally unintuitive to me from a basis of minimal human biology knowledge. Anyways, this is very relevant to knowledge workers many of us eventually succumb to forward head posture, which is like slamming on the brakes of a car doing 100mph. Except we do it every day for hours at a time. Eventually stuff gives out.