According to the American Association of Clinical Endocrinologists, a thyroid nodule is a lump in or on the thyroid gland. Any time a lump is discovered in thyroid tissue, the possibility for cancer needs to be considered. Fortunately, the vast majority of thyroid nodules tend to be benign. The AACE says nodules can be caused by a simple overgrowth of "normal" thyroid tissue, fluid-filled cysts, inflammation, or a tumor. For more information please read this related article: What Is a Thyroid Adenoma?
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