Medical Definition of Hyperthyroid

Our Hyperthyroidism Main Article provides a comprehensive look at the who, what, when and how of Hyperthyroidism

Hyperthyroid: Having an excessive amount of thyroid hormone resulting from an overactive thyroid gland or from taking too much thyroid hormone. Symptoms of hyperthyroidism can include increased heart rate, weight loss, depression, and cognitive slowing. Treatment can include medications, the use of radioactive iodine, thyroid surgery, or a reduction in the dose of thyroid hormone.

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Last Editorial Review: 3/19/2012

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