The thyroid gland produces the hormones thyroxine (T4) and triiodothyronine (T3). In most cases of hyperthyroidism , the thyroid gland itself produces too much of these hormones. However, hyperthyroidism can also be caused by taking too much thyroid hormone medication for hypothyroidism . This is called factitious hyperthyroidism. When this occurs because the prescribed dose of hormone medication is too high, it is called iatrogenic, or "doctor-induced," hyperthyroidism. Factitious hyperthyroidism can also occur when a patient intentionally takes too much thyroid hormone, such as in people: Who have psychiatric disorders such as Munchausen syndrome; Who are trying to lose weight; Who want to get compensation from the insurance company . Children may take thyroid hormone pills accidentally. In rare cases, factitious hyperthyroidism is caused by eating meat contaminated with thyroid gland tissue.
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