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| Q. |
What is "sub-clinical hypothyroidism?"
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| A. |
By sub-clinical, we mean that people experience some of the effects of low thyroid function even though their tests are normal. That means their thyroid hormones are within normal ranges on laboratory testing. The body's thyroid hormones (T4 and T3) are made in the thyroid from iodine and amino acid tyrosine, while Thyroid Stimulating Hormone (TSH) is secreted by the pituitary and directs thyroid activity.
Low thyroid symptoms include a frequent sense of feeling cold and low body temperature that can actually be measured (thyroid controls our body heat). Other symptoms include dry skin, hair loss, constipation, and fatigue, including poor endurance. This suggests that the pituitary and thyroid have become accustomed to this lower level of thyroid and have "agreed" that it is acceptable; however, that does not necessarily mean it is optimal. Giving some supplemental or replacement thyroid, gradually increasing the dosage, may be quite helpful and is worth a try. Discuss this with your doctor, since thyroid must be prescribed by a physician. It is important to monitor both the individual
response – any symptom improvement – and the blood levels of the thyroid hormones.
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| Q. |
My doctor thinks I should use Synthroid (synthetic thyroid) rather than the natural thyroid (such as Armour or Westhroid). What is your opinion?
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| A. |
In general, I prefer using natural (animal) thyroids because they support both thyroid hormones, T4 and T3. This gives more balanced support and an overall better experience for patients with hypothyroidism. This phenomenon has also been confirmed with a recent study in which people taking both hormones, Synthroid for T4 and Cytomel for T3, had more positive experiences in their sense of well being from the hormone support.
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| Q. |
I heard there was a study that showed taking too much thyroid could lead to
osteoporosis. What do you know about this?
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| A. |
Initial studies in patients with hyperthyroidism demonstrated bone calcium loss, i.e. osteoporosis. This was evaluated in people who were receiving thyroid replacement at levels that were excessive. In those who showed markers for excessive circulating thyroid hormones, the osteoporosis risk was also present. Therefore, it appears wise to regulate thyroid function so that hormone levels and TSH remain at reasonable levels.
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