Do you know of any research into the effects of where you live on thyroid function? I've had an underactive thyroid for about 15 years. The amount of medication I have needed has fluctuated over the years and in the last 3 years it decreased to 25mmg 5 times a week. Last year I spent 7 months in a place called Al Baha, a high altitude town in the mountains of Saudi Arabia. after about 2-3 months of being there my thyroid started functioning normally, i came off all medication and felt normal - as I had 17 years ago.
Since I left Saudi I have been living in Thailand and I'm back on medication 50mmg per day (and it's been increasing since I've been here - 6 months). Asia is where my thyroid function is at its worst. I spent 2 years in Tanzania before Saudi and that's where I reduced my medication quite significantly.
I had forgotten what it felt like to feel healthy and happy so obviously, I'm interested to know how my thyroid can get better just by moving! I don't want to go and live in the Saudi mountains permanently!!