​Majority of benign thyroid nodules are stable or slow-growing over time and do not cause symptoms (found incidentally). However, sometimes there may be neck pain, swallowing difficulty, foreign body sensation or cosmetic issues (visible or palpable swelling in the neck). Certain thyroid nodules may also rarely produce high levels of thyroid hormone, which can cause a wide range of symptoms including irritability, weight loss, difficulty sleeping, visual problems and heart palpitations.