Joe --

Lots of possibilities here. I have a lot of muscle pain issues -- some of which are attributable to post-radiation fibrosis, some to post-neck dissection issues, and some to limited exercise for a long time. I am three years out from treatment-- still do pretty much anything I want, but it is more difficult and painful.

I agree that you should check with your docs -- both your cancer team and your primary care physician. Cancer team isn't always terrific about late effects diagnosis and treatment. Can't tell what treatments you had, but any or all of these can have an impact. Exercise, physical therapy, massage are all possible modalities to help.

Good luck!