A thyroid nodule is a lump on the thyroid, a butterfly-shaped gland located inside the front of your neck. Thyroid nodules are rarely cancerous. However, a large thyroid nodule or many nodules can put pressure on your throat area, leading to breathing or swallowing problems. Certain thyroid nodules cause the thyroid gland to produce too much hormone, causing hyperthyroidism. Follow the links below to find WebMD's comprehensive coverage about how a thyroid nodule develops, the causes, risk factors, how to treat it, and much more.