Joint pain and stiffness are known side effects of Arimidex (anastrozole) an aromatase inhibitor used for treating some types of breast cancer. You can read side effects in this drug info from Mayo Clinic http://mayocl.in/2m5bKo9. You may also wish to post a message in the Connect Breast Cancer group to this discussion about anastrozole:
– Concerned about the side effects of anastrozole http://mayocl.in/2d4tiKL
I can imagine that you’re concerned about starting anastrozole again. Anastrozole is one of 3 aromatase inhibitors. Each has a different set of side effects. Perhaps a different drug would be better for you. Have you talked to your oncologist about taking exemestane (Aromasin) or letrozole (Femara)?