I have been on anastrozole for 10 months. I have for the last 7 months had pain in and lower back. Because I was diagnosed with arthritis in both areas, I thought that was my problem, until I read some of the comments here. I also had a reduction done on my other breast at the same time as the mastectomy. I also have pain and soreness in that breast for over 10 months now. The surgery scars have keloids, and they are painful and sore. I would like any information from others as to ways to cope with this as I have to be on the medication for 5 years.