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  • The thyroid gland controls important metabolic processes such as growth and energy expenditure.
  • Hyperthyroidism means the thyroid gland is overactive.
  • An immune system abnormality called Graves' disease is the most common cause of hyperthyroidism.
  • People treated for hyperthyroidism normally end up with an underactive thyroid - which is called hypothyroidism.

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Reviewed on: 06-12-2011