Has anyone ever experienced an odd tension in their bodies that causes them to habitually grind their teeth? For the last month, I have noticed that the muscles in my jaw are almost perpetually clenched. I have to make a very deliberate decision to try to release the tension. I am grinding my teeth almost all the time. At the same time, I noticed that my shoulders are involuntarily shrugging up towards my ears, which is causing upper back pain, in addition to the jaw pain. It is so odd. It is as if the muscles in my body from my shoulders up to my head are locked in some bizarre kind of tensed state that no amount of relaxation or hot water therapy can alleviate.