John -

I thought so as well until this week when I went to my Endocrinologist doc for my 90 day checkup. I have been struggling with thyroid numbers being whackers ever since the onset of PMR and now I have hyperparathyroidism we are watching.

My T3 thyroid number was extremely low. This is the hormone that every cell in your body needs and it is what the thyroid gland is all about. T4 is what your thyroid gland produces and it is up to your body to convert T4 to T3. Nothing is simple in your endo system. Low T3 can cause fatigue for sure.

My Endocrinologists explained to me that prednisone interferes with your bodies ability to convert T4 so she was not surprised. So, I guess chronic fatigue when we are on steroids for PMR is the cost of getting well.

I intend to talk via MyChart with her about possible treatment options, but we needed to discuss my hyperparathyroidism more than my T3.

Thought I would share and see if others have stumbled over the same information while on their journey - and what was done if anything to treat it.