Facts about the Thyroid

1. 09

   Graves' disease causes the thyroid to produce excessive hormones by generating autoantibodies that bind to TSH receptors, affecting approximately 0.5 percent of the global population.

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2. 08

   Calcitonin, a hormone produced by thyroid C cells, helps regulate blood calcium levels by inhibiting osteoclast activity and promoting calcium excretion through the kidneys.

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3. 07

   During fetal development, the thyroid gland begins producing hormones by week 12 of gestation, allowing the fetus to regulate its own metabolism independent of maternal thyroid function.

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4. 06

   A single thyroid gland weighs approximately 20-25 grams and produces roughly 80 micrograms of T4 and 4 micrograms of T3 daily in healthy adults.

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5. 05

   TSH levels between 0.4 and 4.0 mIU/L define normal thyroid function in most adults, though optimal ranges for fertility and pregnancy are often considered 0.5 to 2.5 mIU/L.

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6. 04

   Hashimoto's thyroiditis, an autoimmune disorder affecting the thyroid, accounts for approximately 90 percent of all hypothyroidism cases in iodine-sufficient regions.

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7. 03

   In 1896, Eugen Baumann discovered that the thyroid gland concentrates iodine at levels up to 10,000 times higher than in blood serum.

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8. 02

   Thyroid hormone production increases metabolic rate by approximately 20-30 percent when T3 and T4 levels rise above normal ranges.

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9. 01

   Approximately 15-20 milligrams of iodine circulates through the thyroid gland daily, with roughly 50 percent recycled from degraded thyroid hormones.

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