That's what some research seems to indicate. I have Graves' Disease. I was living in South Korea when I was diagnosed. There they don't immediately prescribe radiation or surgery. Instead, I took an oral medication to slow my thyroid down. After a few months of that, we started block and replace therapy. That is I took medication to completely block the production of hormones by my thyroid and then took Synthroid. The best way I can explain it is the treatment literally gives the over-active thyroid a break. This approach seems to be based on a theory that was researched in Japan. I like that the first step is to try to preserve the thyroid and only if that doesn't work is radiation or surgery considered.
For me the party is over. I moved back to the USA, working for myself (starting off, so building up clients slowly) and doing contract work. Therefore, I'm uninsured. However, I feel much better and once I'm back in the system, I'll go for blood work to confirm what's going on with my thyroid now. But I don't have any of the symptoms that I had when I was diagnosed.
Also, my doctor when I was abroad was very conservative. Instead of just a year of block and replace, I was on oral medication for around three and a half years, and using the block and replace treatment for it for around two or so years. I'm hoping that was more than enough time to give my thyroid a rest. It feels like it, but there is no way to confirm that without blood tests. (And people say nothing is wrong with our health system...there most certainly is A LOT wrong with it.)