This conversation has many people discussing side effects of anastrazole.
https://connect.mayoclinic.org/discussion/i-completed-all-treatments-for-breast-cancer-but-now-i-am-supposed/

Funny you should ask. I have been on Anastrozole for 21 months and I have had one trigger finger surgery and now have a trigger thumb that I am having an injection for tomorrow. Did you know the drug causes type 2 diabetes? I was told I will go blind due to the fact I now have diabetic retinopathy. Check what your blood glucose was before you started this drug. I am 70 and diabetes doesn't run in our family. However, I didn't know one of the many side effects of this drug is making you a diabetic.

I have trigger thumb. I did mention to my oncologist and he said it was not from med. I also started having hip joint pain back last May , enough that I had to stop going to gym. Trigger thumb just all of a sudden started during the night when it got stuck and I couldn’t straighten it. This has been since November.
I stopped my Anastrozole for 3 months. It didn’t improve any of my issues, so I started it up again. I’ve taken it for 2 years 2 months counting the break away from it. Unfortunately, arthritis gets the blame for everything that doctors can’t explain or do not want to deal with. Best of luck to you. 🙏🏼