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Hyperthyroidism in Pregnancy

Medically reviewed by Last updated on Jun 5, 2024.

What is hyperthyroidism?

Hyperthyroidism is a condition that develops when the thyroid gland makes too much thyroid hormone. Thyroid hormones help control body temperature, heart rate, growth, and weight.

Thyroid and Parathyroid Glands

What causes hyperthyroidism?

What are the signs and symptoms of hyperthyroidism during pregnancy?

The signs and symptoms of hyperthyroidism may start slowly, and you may not notice changes right away.

What is a thyroid storm?

Thyroid storm happens if your thyroid hormone levels get too high. Your temperature may go very high, your heart may beat very fast, and you may have problems thinking. You may have increased sweating, vomiting, or diarrhea. You may have seizures or go into a coma, which can be life-threatening if you do not get medical care quickly. Thyroid storm may happen if you have hyperthyroidism and get an infection or stop taking your thyroid medicine. Injuries, burns, and certain medicines can also cause a thyroid storm.

How is hyperthyroidism during pregnancy diagnosed?

Your healthcare provider will ask about your symptoms and the medicines you take. He or she will ask about your medical history and if anyone in your family has thyroid disease. You will have blood tests to check your thyroid hormone level.

How is hyperthyroidism during pregnancy treated?

Treatment for hyperthyroidism during pregnancy will depend on your health, age, stage of pregnancy and the size of your thyroid gland.

Treatment options

The following list of medications are related to or used in the treatment of this condition.

View more treatment options

When should I call my doctor?

When should I seek immediate care or call my local emergency number (911 in the US)?

Care Agreement

You have the right to help plan your care. Learn about your health condition and how it may be treated. Discuss treatment options with your healthcare providers to decide what care you want to receive. You always have the right to refuse treatment. The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.