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Hypothyroidism
When you're hypothyroid, you don’t have enough thyroid hormone. You may not make ENOUGH thyroid hormone, because:
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You have autoimmune Hashimoto’s thyroiditis
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You're iodine deficient
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You’re taking a medication that causes hypothyroidism (i.e., lithium)
That makes you a “Low Producer.”
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You may not make ANY thyroid hormone, because:
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Your thyroid was surgically removed
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You had radioactive iodine (RAI) ablation treatment
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You were hypothyroid from birth
That means you're a “Non-Producer.”
When you're hypothyroid, you may not have enough of the active T3 hormone, because:
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You’re not converting enough T4 into T3
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You convert T4 into too much Reverse T3
That makes you a “Poor Converter.”
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Causes of Poor Conversion of T4 to T3
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The most common causes of poor T4-to-T3 conversion include:
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Common genetic defects, called polymorphisms
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Nutritional deficiencies
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Physical and emotional stress
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Surgical removal of the thyroid gland, radioactive ablation of the thyroid, and atrophy due to Hashimoto's thyroiditis
Thyroid Stimulating Hormone (TSH)
The thyroid stimulating hormone (TSH) test can give a general picture of thyroid function. Levels that are high-normal or high can indicate hypothyroidism.
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Triiodothyronine (T3) and Free T3
Total T3 and Free T3 levels that are low, or low-normal can show hypothyroidism, and poor conversion from T4.
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Reverse T3 (RT3)
High-normal and high Reverse T3 levels can leave you with insufficient levels of active T3 hormone.
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The Treatment for Hypothyroidism
The treatment for hypothyroidism is thyroid hormone replacement medication, to provide the thyroid hormone you’re missing. The treatments include:
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Levothyroxine (synthetic T4)
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Liothyronine (synthetic T3)
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Natural Desiccated Thyroid (natural T4 and T3)
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