Good question! And unfortunately I have to answer with ‘I don’t know’. I was diagnosed with osteoarthritis in my shoulders and knees about 10 years ago. But now, I don’t know if the worsening of joint pain is from further deterioration from arthritis, or if it’s from the cancer drugs. My shoulders and knees seem to be worse now than what they were last year when I was diagnosed with BC. I don’t know if my joints have worsened because I couldnt keep up with much exercise following surgery and radiation, or if it’s the cancer meds that are causing increased joint pain. But, yes, my joint pain has worsened over the past year since I was diagnosed. I’m back now to my regular yoga classes and that does seem to help, whatever the cause.