What are thyroid nodules?

Thyroid nodules are solid, or fluid-filled, lumps that form in the thyroid. This is a small gland that sits at the base of your neck, just above your breastbone. Thyroid nodules don’t usually cause symptoms and aren’t often serious. But sometimes they can become large enough that it’s hard to swallow and breathe normally. In this case, surgery may be needed to remove it.