Hyperthyroidism: Overview and More

Goiter refers to abnormal growth or enlargement of the thyroid gland. Goiter can occur for many reasons, including insufficient thyroid function (hypothyroidism), hyperactivity (hyperthyroidism), or normal function (euthyroidism). While some people do not experience any symptoms of goiter, others may have a feeling of fullness in the neck, a change in voice, or difficulty breathing or swallowing, among other symptoms.

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