Many thyroid nodules do not have any symptoms. Some thyroid nodules may become big enough to interfere with swallowing or breathing. Some of them may cause changes in voice. Thyroid nodules are usually not painful. Having no symptoms, they are sometimes found when a scanning of the neck or chest is done for some other reason.
You may sometimes see a projection in your neck while trying to button up your collar, while shaving or even just by looking in the mirror. They tend to move when you swallow. The thyroid even without a nodule may feel a bit bumpy. Just by clinical examination, some nodules can be identified as cancerous by the endocrinologist. So, if you notice a swelling in your neck, it would be wise to meet an endocrinologist.