@mjay As Colleen noted, there are not uniform reactions to anastrozole, but bone and joint aches seem to be fairly common. Mine started about three months after initiating it. At the time, exercise on the treadmill seemed to help. Of course, exercise options are different for many of us during the pandemic... I'm sitting more now for one thing... and alas, I'm older.

Nevertheless, and for other reasons, I switched AIs last October. I haven't noticed the bone aches for several months now. It is something which you might want to consider. Do discuss this option with your oncologist and let us know.