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Hyperthyroidism means that your body has too much thyroid hormone, which controls how your body uses energy. Too much thyroid hormone can make you lose weight quickly, have a fast heartbeat, sweat a lot, or feel nervous and moody. If it isn't treated, it can cause serious problems.

Current as of: May 12, 2017

Author: Healthwise Staff

Medical Review: Adam Husney, MD - Family Medicine & E. Gregory Thompson, MD - Internal Medicine & Anne C. Poinier, MD - Internal Medicine & Kathleen Romito, MD - Family Medicine & David C. W. Lau, MD, PhD, FRCPC - Endocrinology