The answer by Dhruv Gupta, M.D. does not explain the reasons for this.
My first memory of this queasy pain was actually blowing up a balloon but it felt like my cheeks expanded further than they should behind the jaw.
I used to notice it when drinking a cold pint of beer in the sun. Anyways just wanted a new thread as the the Drs solution does not solve anything, it just avoids it.