I wrote on here a couple of months ago explaining how I got referred to an endo to have a review of my T3, (I am T3 only) following the usual issues with the CCGs going on everywhere. He had not treated anyone T3 only, although did prescribe T4/T3 and he was actually OK about me continuing.
However he was very alarmed about my TSH being below range, and wanted me to reduce it to get into range - despite me having no symptoms of being overtreated (I had low BP, normal pulse, and lowish temps at that time). He also referred me for a bone density scan (I am 64 and 15 years post menopause).
Meanwhile I tried to reduce my T3 to see how I did, and actually managed to reduce my 55mcg (over 3 daily doses) to 45 mcg (3 doses) without too many symptoms apart from the first few weeks when I felt very lacking in energy. Then I did seem to stabilise somewhat, and he made mention of the thyroid receptors resetting.
Unfortunately I heard last week that I DO have osteoporosis which was a bit of a shock as I felt I was low risk. I had 2 of my T scores of 3.2. It's not likely that T3 has been the cause of all of that (if at all) as I have only been on T3 for 4 years, but I feel I have to be cautious now in what I do and try to improve my bone density if possible.
My TSH after a month of 45 mcg is still below range, and the endo wanted me to try reducing furher. This week I began to drop by a further 5 mcg to 40 mcg per day, and almost instantly I have pretty horrendous joint and muscle pain that I did not have before. I am prepared to try this despite the pain for a few weeks, but of course common sense says that after that I need to raise my T3 again to the previous dose where I had no pain.
I know that research indicates that very low TSH might contribute to bone fractures, but continuing pain would mean I would be put off doing any exercise! Interestingly my GP is not currently harassing me to reduce more, and the endo has left his job and gone elsewhere, so maybe I will be left in peace to make my own decisions on this!