03/30/2026
Estrogen & Hashimoto’s - What’s the Connection?
Hashimoto’s is an autoimmune condition where the immune system slowly attacks the thyroid, which can affect how well it produces hormones.
Hormones like estrogen and progesterone may also play a role. Higher estrogen levels can increase immune activity and have been linked to thyroid conditions like Hashimoto’s and hypothyroidism.
Estrogen can slow thyroid hormone activity and raise TSH, while progesterone tends to support thyroid balance. When estrogen is higher and progesterone is lower, it may make it harder for the thyroid to function at its best.
Hormonal shifts like those seen with PCOS or pregnancy may also be connected to increased autoimmune thyroid activity.
Since hormones and the immune system work closely together, supporting hormone balance can be an important part of caring for thyroid health.
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