I was wondering if it is the tamoxifen I am on or could my cancer be back and in my bones?

Hi, Its hard to say but tamoxifen can cause muscle stiffness and soreness. If you had a bone scan and it was negative then I would think that it is unlikely (low probability) to be there. If your bone scan did have cancer present on it then it is plausible.
Hope this helps.
Simeon Jaggernauth, DO.

www.DRJAG.com