Hi everyone - it's been a while since I've posted a message BUT I have a real problem. I have been on Arimidex for 3 years now. I didn't do well on Arimidex for the 1st 6 months but then everything got better - no pain anywhere! The only thing I suffer from occassionally is joint stiffness - but that's not really an issue. THEN in March of this year, my left rib cage began to hurt. It has persisted until now (July). I had breast cancer surgery (right side) in 2004. But it is my left rib cage that is hurting. I have had x-rays and a bone scan done and nothing is showing up. So, now I wonder if it could be a side effect from the Arimidex? Have any of you who are or have taken Arimidex experienced this problem? The rib cage itself is tender to touch but mostly it just feels like a HUGE catch in my rib cage area - like something is in there. This is worrisome to say the least. Please write me back if any of you have experienced this kind of pain. I can't imagine what it is as many of our vital organs are on our right side. I look forward to hearing from any of you when you have a mintue to write. Thanks!! Carolyn in Washingto state