I've heard it referred to both ways. Temporomandibular disorders, I guess, is the correct technical name.
Basically, problems w/ the lower jaw.
I'm 47, never had any sort of problem with my jaw.
My problem started about two weeks ago. Basically, when I wake up in the morning my teeth won't align if I bite down. I have to use the palm of my hand to push on my lower jaw while biting down to get the teeth to mesh properly. Takes several minutes. Painful, but tolerable.
Then it goes out of whack throughout the day.
Moving jaw (opening mouse) can cause discomfort.
I've read that chewing gum causes problems for people w/ TMD. Funny thing is, I was chewing one to two sticks of gum per day until about a month or two ago because I like peppermint gum. I stopped, in fact, because the store kept running out of my favorite gum and I thought "to heck with it, I'll save the money and skip the gum." Also, even though it was sugar-free, I was told by a really smart guy that it is still hard on the fillings.
I've also had a bad cold and possible sinus infection for the last week or so. I hear that can contribute.
I'm sure hoping this clears up.
Great way to lose weight, though.
Any tips/tricks for enduring this would be welcome.