Your thyroid is a butterfly-shaped gland in your neck that controls how fast your body burns fuel. When it acts up, the signs can pop up anywhere from your hair to your heart. Neck lump is the classic red flag. You feel or see a bump that bobs up when you swallow. Energy swings are common. With hypothyroidism you feel like you’re “running on empty,” while hyperthyroidism makes you wired, shaky, and unable to sit still. Weight moves without trying. Hypo adds pounds even when you eat less; hyper peels them off despite extra helpings. Hair and skin change. Hair... Learn more