Anastrozole
"I started anastrozole one year ago in June 2014 after a double mastectomy.  I did not need chemo or radiation as I caught the cancer early and my Oncotype DX score was very low.  The first 3 months I didn't notice any side effects.   But then  I gained(so far) 10 lbs. and I am very active and work out 5 days a week with weights and cardio(I am 60 yrs. old now)    My hips, lower back especially left side and knees hurt allot and my knees feel weak. It makes it very difficult to get up off the floor. Also both thumb joints hurt all the time. No hair loss or nail issues but some hot flashes.  I wonder if it will get worse-still have 4 years left."