The thumb-size gland rules your waistline, energy level, and mood. Aug. 21, 2011— -- Kristin Angelov was 26 when the exhaustion hit. Getting up in the morning was a superhuman effort, a ...

An overactive thyroid (hyperthyroidism) is relatively rare, affecting just 1% of people in the US. It occurs when your thyroid glands produce too much of a hormone called thyroxine.