The endocrinologist believes mine was caused by the heavy metals in my body, I was treated with the usual med to calm it down. As the heavy metals left, the thyroid healed. That was fortunate, because I was headed for radiation to kill the thyroid - we had to delay it for some reason, and 2 months later my tests started to normalize just after my metal tests returned to the normal range.

It is still monitored with bloodwork every three months, because I understand it can return.
Sue