The thyroid gland is a small, butterfly-shaped gland located in the neck. This gland helps control the rate at which your body functions and how your body works. It produces hormones that are transported through the bloodstream to other parts of the body. Thyroid hormones tell the body how fast to work and how to use energy. When you're healthy, your thyroid works like an air conditioner; it kicks in when needed and shuts off when necessary. It stops producing thyroid hormone