If TSH is normal and T3 is high, it may indicate a condition known as T3 toxicosis or hyperthyroidism. Hyperthyroidism is a condition in which the thyroid gland produces too much of the hormones thyroxine (T3) or triiodothyronine (T4). Hyperthyroidism can be caused by a number of things, such as Graves' disease, toxic nodular goiter, or subacute thyroiditis. In some cases, certain medications or supplements can also cause elevated T3 levels. If you have been diagnosed with hyperthyroidism, treatment will depend on the underlying cause and the severity of your symptoms. Treatment options may include medications to reduce thyroid hormone levels, radioactive iodine therapy, or in some cases, surgery to remove the thyroid gland. It's important to work closely with a doctor to monitor thyroid function and determine the best course of treatment. Thyroid hormone levels may need to be checked regularly to make sure that treatment is working and to adjust the doses of medications as needed.

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