Dear lechug: Joint pain is not a
commonCommon cold side effect of Arimidex http://www.chemocare.com/bio/bio.sps?iBiographyID=9075. But, sometimes side effects can occur that are not common. Your best bet would be to discuss this with your doctor. If there is sufficient evidence that the Armidex is the culprit, there are other medications that can be tried. Your doctor can better comment on whether to treat you symptomatically or look at a different breast cancer drug.