My son was on Lithium for three years. During those years he was hungry all the time and gained a ton of weight, but idiot psychiatrist, who misdiagnosed him, never told me to check his thyroid. I feel really dumb because I know it can cause thyroid problems. He has been off all medications now for four years, but, since the Lithium, he has never stopped being hungry ALL THE TIME. He is five four and a half and 170 pounds, and a neverending garbage can for food. He is always hungry. I'm asking for a thyroid test. Just wondering. If he quit Lithium could he be having thyroid problems from when he was taking it?