Do you find you're congested a lot too? I have been getting a ton of congestion in my sinuses and I find the extra pressure causes mouth pain. My friend is a dental hygienist and says its very common to feel mouth and jaw pain when your sinuses are acting up. Especially if you have a sinus infection.
Hope you figure it out and feel better :-)
Mine hasn't been hurting but I've noticed it pops a lot and really loud.
I've had this issue with a few of my pregnancies. My Dr. Told me its just due to hormones that makes muscles relaxes. It ***** but made me feel better hearing it happens. Luckily it has went away after my last birth and I'm hoping it will stop after this one lol. Hopefully yours gets better.
Maybe your grinding your teeth when sleeping? My mom would complain about her jaw hurting/sore frequently, then I caught her grinding her teeth while napping...
My jaw bacame sore in the beginning I thought I was having a bad toothache and had my dr call in an antibiotic but it didn't help. I guess its because our joints are loosening up and that causes the pain. Even in our jaws. Mine didn't last long maybe a week in a half. Good luck and hope u feel better soon