Possessed said:
For the last couple of days my jaw has been cracking on the left side underneath my ear. Anytime I open my mouth wide enough to yawn or take a bite of food, and depending on the food with every chew it cracks. It's painless, but extremely annoying.
Keep it up and you won't be able to stop. I started cracking my jaw ~15 years ago and I've had to do it everyday since to keep the pain at bay.