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Hypothyroidism in Pregnancy

Hypothyroidism in Pregnancy

Hypothyroidism means an underactive thyroid gland, which does not make enough thyroid

hormone. Thyroid hormone controls the body’s metabolism.

What are the causes of hypothyroidism?

Overall, the most common cause of hypothyroidism is the autoimmune disorder known as

Hashimoto’s thyroiditis and occurs in 2 to 3 out of every 100 pregnancies.

More rarely, people who have had treatment for an overactive thyroid gland or a thyroid

tumor with surgery or radioiodine therapy may develop hypothyroidism.

What are the symptoms of hypothyroidism?

Untreated, or inadequately treated, hypothyroidism has increased risk of miscarriage, and

has been associated with maternal anemia, myopathy (muscle pain, weakness), Carpal

tunnel syndrome, Constipation, fatigue, Skin and hair changes, inappropriate weight gain,

cold intolerance, Swelling of the face, congestive heart failure, preeclampsia, placental

abnormalities, and postpartum hemorrhage. These complications are more likely to occur in

women with severe hypothyroidism.

Women with mild hypothyroidism may have no symptoms or attribute symptoms they have

to the pregnancy.

How is thyroid function tested?

Thyroid function tests are the mainstay. You will have blood test that measures thyroid

hormone (T4) and serum TSH levels to check for hypothyroidism. Hypothyroidism is often

suspected when TSH levels are above normal and T4 levels are below normal.

How is hypothyroidism treated during pregnancy?

Thyroid hormone replacement is used to treat the mother. Dosage of thyroid hormone

replacement therapy is based on the individual’s levels of thyroid hormones. Thyroid

hormone levels may change during pregnancy. And, the thyroid replacement dosing may

also change. Thyroid hormone levels need to be checked every 4 weeks during the first half

of pregnancy. Your doctor will most likely prescribe levothyroxine. Levothyroxine is safe for

your baby and especially important until your baby can make his or her own thyroid

hormone.

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Hypothyroidism in Pregnancy

Hypothyroidism means an underactive thyroid gland, which does not make enough thyroid hormone. Thyroid hormone controls the body’s metabolism. What are the causes of hypothyroidism?