| A thyroid nodule is defined as a small lump of tissue, usually more than one quarter of an inch in diameter that may protrude from the neck's surface or may form in the thyroid gland itself. |
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Thyroiditis is an inflammation on the thyroid gland and the most common cause of hypothyroidism. Thyroiditis, or inflammation of the thyroid gland, has many causes. The most common cause is Hashimoto's thyroiditis. |
