Having had chronic hip pain for over three months this thread is a real eye opener. I saw my rheumatologist last month as I also have lupus and she thought the prosthesis from my hip replacement had moved but X-rays proved that wasn’t the case. I have just started a break from letrozole to see if that was causing the pain and waiting to see. But reading @silversilver ‘s reply I’ve just realised I’ve been on a different brand since Christmas as my normal one hasn’t been available. Now it all makes sense and after all the struggles I’ve had with letrozole I think this break could become permanent. Thank you for starting this thread and to all who respond, I was seriously considering the breast cancer had spread to my bones and been getting myself in a state.