The thyroid gland is a butterfly-shaped organ located in the front of the base of the neck that produces hormones that regulate many important functions of the body (e.g. breathing, heart rate, brain and nerve function, body weight, temperature muscle strength and many others). A thyroid nodule (or lump) is a fairly rare unusual firm growth of cells that occur within the thyroid gland and there are several types. While thyroid nodules are frequently benign in children (non-cancerous) they are more likely to be cancerous than they are in adults. Learn more about Thyroid Nodules.