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Definition of Hyperthyroid

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.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=3849
Last Editorial Review: 3/19/2012

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