You are having surgery to remove part or all of your thyroid. The thyroid is a gland in the front of the neck. It sits just below the voice box (larynx). The gland's main job is to make thyroid hormone. This helps control the body's metabolism. Thyroid surgery may be done to treat an enlarged thyroid (goiter). Or it may be done to remove a lump (nodule). It may also be done to treat an overactive gland (hyperthyroid). Or it may be done to treat a gland that may have cancer cells.