In Newsletter9, we have seen that a selenium deficiency triggers
The symptoms of hypothyroidism by selenium deficiency do not differ from the symptoms of hypothyroidism
caused by an insufficient thyroid hormone production by the thyroid gland.
Here Is Why
In both cases the cells that rely on thyroid hormone for the regulation of their activity, are deprived of
sufficient thyroid hormone. Hence identical symptoms appear.
In case of hypothyroidism by thyroid gland insufficiency, the origin of the symptoms is obvious. There is
lack of thyroid hormone in circulation. Blood tests will indicate it. Also the TSH test--a test that
monitors the thyroid gland's ability to produce thyroid hormone--confirms that the thyroid gland is unable to
deliver a sufficient quantity of thyroid hormone in the blood circulation.
In case of hypothyroidism by selenium deficiency, the symptoms are the same, only their origin is less
The blood tests indicate that thyroid hormone is present in the circulation in acceptable quantity.
are two thyroid hormones in circulating blood : Tetraiodothyronine (T4) and triiodothyronine (T3). T3 is
about 15 times stronger than T4. As we have seen in
Newsletter9 , Selenium is essential
for the conversion of T4 in T3.
In case of hypothyroidism by selenium deficiency, subtle differences
may occur in the thyroid hormone blood test results, like a relatively lower level of T3 and an unbalance in
the T4 to T3 ratio. These subtleties are easily overlooked, because in the case of hypothyroidism by
selenium deficiency, the TSH test indicates that the thyroid gland produces sufficient thyroid hormones to
maintain the thyroid hormone blood levels between acceptable range.