Hi Kat!

May not be relevant in this case, but the repetitive motion issue PoppaGator mentioned is something to consider - and it doesn't always take motion. Make sure you're not sitting or lying in a strained position to relieve some other aches and pains - it is all connected, as you say, so (for instance) the slightly higher (or lower) pillow you using at night could strain tendons in your neck, putting pressure on your shoulder.

I know if I'm sitting in bed reading and slouch down, I not only get the expected backache and stiff neck, but my shoulder sometimes hurts because I'm holding my arm in some odd position to compensate for not sitting up straight. And none of them hurt at the time I'm doing it, so it's easy for me to not notice - though there is a bit of wisdom that comes with age! :)

Of course, Charley can sit in any which way without ever getting stiff - heredity (and being generally more active) does help!

Best of luck!
JudyB