This is very true Trapper, both myself and my friend had slight swelling of the thyroid after a couple of days of supplementing iodine. As it wasn't a big problem we both persisted with Iodine and the swelling dissappeared within a week. Never looked back from then :)
Its my belief that my poor thyroid was so used to doing with little or no iodine, when I finally gave it some it went into a bit of shock.