Thanks @duxx1234 your post has precipitated a most interesting conversation from members.Thankyou all too.
I am starting to think that the depletion of vit D levels by chemo might explain why those who are also er+ seem to have bigger problems with joint pain when on aromatase inhibitors than those who have not had chemo.
Aromatase inhibitors are known to reduce bone density causing joint pain and fractures.I know ,having osteoporosis prior to breast cancer myself, that low vit D is associated with low calcium absorption and contributes to osteoporosis with symptoms of joint pain and fractures.So maybe those who have chemo and are er+ start aromatase inhibitors with lower bone density.
I have not had chemo and have been on Letrozole 6 months and joint pain has thus far been manageable although a couple of other side effects have been disconcerting like a spike in my formerly good cholesterol.
Apologies if I appear naive as I have been surprised to hear some of the difficulties others have had with aromatase inhibitors esp severe joint pain.I might add I also have the benefit from 6 monthly injections of Prolia to prevent further fractures which I guess may also explain why my joint pain has been manageable as well 2 Caltrate Bone and Muscle Health daily to provide the recommended doses of calcium and vitamin d suggested by Osteoporosis Australia for my age and situation.