The thyroid gland sits in front of the neck, just above the collarbone. It has spaces filled with a fluid where thyroid hormone is made using iodine. The thyroid gland controls metabolism by making thyroid hormone. Metabolism is how the body uses energy.
Thyroid nodules develop when thyroid tissue grows into a small lump. Some nodules are solid, and some contain fluid. If a nodule only contains fluid, it is called a cyst. Thyroid nodules are different from a goiter. A goiter is when the entire thyroid gland becomes enlarged. Goiters can contain thyroid nodules.
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Wu J. Thyroid Nodules. JAMA Otolaryngol Head Neck Surg. 2020;146(6):596. doi:10.1001/jamaoto.2020.0264
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