The thyroid gland is one of the most important endocrine glands in the body. It helps regulate temperature and metabolism. Every cell in the body has receptors to respond to the hormones the thyroid produces. Without ample levels of thyroid hormones, people often feel tired, sluggish and unproductive. Sometimes over-stimulation of the thyroid can make people may feel anxious, experience insomnia, or lose weight inexplicably. If there’s an autoimmune component related to thyroid dysregulation, there are additional tests and treatments that should be done.