My mother was recently diagnosed with breast cancer. She is 82 years old, and had a lumpectomy in August, 2012. She has been on Arimidex 1 mg daily since mid-August - a little over 7 months now. She had a sudden drop in hearing in one of her ears (80% hearing loss, when checked), besides increased joint pain, anxiety, etc, which are better known side-effects of the medicine. Her ENT specialist said the hearing loss was due to Arimidex, and reversible once medication ceased. Her oncologist says there's no connection of hearing loss to Arimidex. I was wondering if anyone here knew anything more about this. Thanks.