The thyroid is a butterfly-shaped gland that lies in front of the
windpipe (trachea), just below the voice box (larynx). The thyroid gland uses
iodine from food to make two thyroid hormones: thyroxine (T4) and
triiodothyronine (T3). The thyroid gland stores these hormones and releases
them as they are needed.
ByHealthwise Staff Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine Kathleen Romito, MD - Family Medicine Specialist Medical ReviewerMatthew I. Kim, MD - Endocrinology