If there is one thing most doctors think they know it's that weight gain can be caused by an underactive thyroid and having an overactive thyroid leads to weight loss. So the thyroid hormone, thyroxine, will lead to weight loss. And magazines, newspapers and websites, especially in the United States openly invite anyone who is overweight to get their thyroid checked. Thyroxine … [Read more...] about Weight Gain on Thyroxine