Thyroid Disorders in Pregnancy
The thyroid is a butterfly-shaped gland located in the front of the neck. It produces hormones that control metabolism. Pregnancy hormones can affect thyroid hormones. Untreated thyroid disorders in pregnancy increase the risk of pregnancy complications. It may cause harm to the developing fetus. There are two types of thyroid disorders:
- Hypothyroidism —the thyroid gland does not produce enough thyroid hormone
- Hyperthyroidism —the thyroid gland produces too much thyroid hormone
The Thyroid Gland
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Hashimoto’s disease is the most common cause of hypothyroidism. The immune system attacks the thyroid gland. Other causes of hypothyroidism in pregnancy include:
- Inadequate treatment of pre-existing hypothyroidism
- Overtreatment of hyperthyroidism with antithyroid medicines
- Increased estrogen levels causes circulating thyroid hormone to become inactive
Graves’ disease is characterized by overactivity of the thyroid. It is the most common cause of hyperthyroidism. Another cause of hyperthyroidism in pregnancy is very high levels of human chorionic gonadotropin (hCG). However, cases of high hCG can resolve on their own.
Last reviewedNovember 2012by Andrea Chisholm
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.