See more hyperthyroidism symptoms. Causes of Hyperthyroidism. The thyroid gland makes the hormones thyroxine (T 4) and triiodothyronine (T 3) that play an important role in the way your whole body functions.If your thyroid gland makes too much T 4 and T 3, this is defined as hyperthyroidism.ee more hyperthyroidism symptoms. Causes of Hyperthyroidism. The thyroid gland makes the hormones thyroxine (T 4) and triiodothyronine (T 3) that play an important role in the way your whole body functions.
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