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How Sex Hormones Affect Thyroid Function
In today’s lesson, “How Sex Hormones Affect Thyroid Function” from the Thyroid Balance course, we dive into how the balance between estrogen and progesterone plays a key role in thyroid health.
When estrogen levels are too high relative to progesterone—known as estrogen dominance—it can increase thyroid-binding globulin, a protein that carries thyroid hormones in the body. This means fewer free thyroid hormones are available for use, leading to symptoms of hypothyroidism.
But estrogen dominance isn’t always about having too much estrogen—it can also result from:
💧 Toxin exposure from plastics, perfumes, and candles containing hormone-mimicking chemicals (xenoestrogens).
⚖️ Imbalanced hormones during perimenopause or from oral contraceptives.
🥗 Gut issues like constipation or dysbiosis that prevent proper hormone elimination.
🏋️ Excess body fat, since fat tissue produces estrogen.At the same time, low progesterone—common with stress, PCOS, or missed ovulation—can also impair thyroid hormone production by reducing the activity of key enzymes needed to make T4 and T3.
✨ The takeaway? Supporting your thyroid also means supporting hormone balance and reducing toxin exposure.
If you’d like to learn how to identify and address these imbalances, check out today’s lesson in the Thyroid Balance course for a deeper understanding of how your hormones and thyroid work together.
