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Graves' disease is the most common cause of hyperthyroidism. Graves' disease causes the thyroid gland to make too much thyroid hormone. Graves' disease, like many thyroid problems, often runs in families.
Other common causes include:
Uncommon causes of hyperthyroidism include tumors or eating foods or taking medicines that contain large amounts of iodine.
Hyperthyroidism can occur at any age but rarely affects children. It affects women more often than men. Graves' disease is the most common cause of hyperthyroidism.
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