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The Symptoms of Low T3 and T4 | eHow.  The thyroid is a butterfly-shaped gland in the neck, just below the Adam's apple, that releases thyroid hormones T3 (triiodothyronine) and T4 (thyroxine). The thyroid regulates metabolism and the function of every cell in the body, and hypothyroidism is defined by inadequate levels of thyroid hormones. Although all hypothyroidism symptoms are related to a slowed metabolism, the symptoms are inconspicuous and vary depending on age of onset.

What Problems Occur From Low Levels of T3 & T4 Hormones

The Symptoms of Low T3 and T4 | eHow. The thyroid is a butterfly-shaped gland in the neck, just below the Adam's apple, that releases thyroid hormones T3 (triiodothyronine) and T4 (thyroxine). The thyroid regulates metabolism and the function of every cell in the body, and hypothyroidism is defined by inadequate levels of thyroid hormones. Although all hypothyroidism symptoms are related to a slowed metabolism, the symptoms are inconspicuous and vary depending on age of onset.

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