About Hypothyroidism & Pregnancy

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    Pregnancy Related

    • Pregnancy can cause hypothyroidism in women who have not previously had the condition.


    • Left untreated, hypothyroidism can cause infertility in women and increase the risk of miscarriage.


    • Thyroid levels in pregnant women have been shown to affect fetal brain development. Hypothyroidism has been shown to have a negative impact on a child's intellectual capacity.

    Expert Insight

    • Because hypothyroidism can affect fetal brain development, The American Association of Clinical Endocrinologists and The Endocrine Society both recommend that all pregnant women have their thyroid levels checked.


    • Another important reason to have thyroid levels checked is that many symptoms of hypothyroidism mimic pregnancy's symptoms, such as fatigue, weight gain and a change in menstruation. Other symptoms of hypothyroidism include constipation, confusion, muscle cramps and slow speech.

    Treatment during Pregnancy

    • Because synthetic thyroid hormones will not harm a growing fetus, women with hypothyroidism taking synthetic hormones may continue to do so during pregnancy. Often the dosage of hormone must be increased during pregnancy.

    Fun Fact

    • A fetus depends completely on its mother for thyroid hormones until his or her own thyroid begins working. This usually occurs around the twelfth week of pregnancy.

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