The thyroid gland is a butterfly shaped organ located in the front of the neck and produces thyroid hormones. Thyroid hormones performed a wide variety of functions including body temperature, body weight, heart rate, nervous system and the digestive tract. Over time, approximately 4-10% of the population will develop nodules (growths or lumps) in thyroid gland. The majority (95%) of thyroid nodules are benign (not cancerous) and remain stable over time. Benign thyroid nodules may be filled with fluid, be solid or partly solid and fluid. It may also represent growth of normal thyroid tissue (colloid nodule), and occasionally produce high levels of thyroid hormone (hyperfunctioning thyroid nodule).