While a variety of things can be happening (only some really bad) it is not uncommon for someone as recently out of treatment as you to have inflammation in the muscles of mastication. I had it on and off for at least 6 months after treatment. This also includes inflammation of the Eustachian tube (ear popping and fullness). Welcome to the wonderful world of cancer survivorship. Without downplaying that something serious COULD be going on here, you are behaving like me and the rest of us who have, at least for now, dodged the big C bullet. Every headache, every sore in my mouth, every pain in my neck.... is that damn cancer coming back. It's a weekly event!! Part of survivorship is dealing with the constant, even subconscious fear/doubts, that you are really past this damn thing. I hope that in your case, the inflammation is just part of your healing process, but get used to the BS of expecting the other shoe to drop syndrome, it is as common as it is unnerving.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.