Yes. Doesn't mean it is, but it can. It can cause you to clench your teeth, tighten your muscles, not sleep well, etc. But it could also be something else entirely, and the fact the doctor doesn't see anything wrong doesn't mean nothing is. The question is, how bad is the pain, where is it, does it go away when you're relaxed, etc. That's one way of trying to decipher things. I'd believe your doc until you have reason not to, which is if it continues, and in the meantime, try to learn some relaxation techniques and see if they do the the trick.