What is Graves Disease?
Graves’ disease is an autoimmune condition in which the immune system produces antibodies that stimulate the thyroid gland to make excessive thyroid hormones. This causes hyperthyroidism, which can lead to symptoms such as a fast heartbeat, sweating, heat intolerance, anxiety, tremors, weight loss, and tiredness.During pregnancy, the condition needs careful management because both pregnancy and thyroid disease can affect the mother and developing baby.
What Are the Risks of Graves Disease During Pregnancy?
When Graves’ disease is not well controlled during pregnancy, excess thyroid hormones and thyroid-stimulating antibodies can affect both the mother and the developing baby. The risks include:Risks to the Mother
- High blood pressure: Poorly controlled hyperthyroidism can increase the risk of high blood pressure during pregnancy
- Pre-eclampsia: Women with uncontrolled Graves’ disease may have a higher risk of developing pre-eclampsia, a pregnancy complication involving high blood pressure and other organ changes
- Preterm labour: Uncontrolled thyroid disease can increase the likelihood of inducing labour before 37 weeks
- Heart problems: Excess thyroid hormone can place additional strain on the heart, causing a rapid or irregular heartbeat and, in severe cases, heart failure
- Thyroid storm: Rarely, severe untreated hyperthyroidism can develop into a thyroid storm, a medical emergency that requires immediate treatment
Risks to the Baby
- Poor foetal growth: Excess thyroid hormone or uncontrolled maternal disease may affect the baby's growth
- Low birth weight: Babies may be delivered early because of complications affecting the mother or pregnancy
- Foetal hyperthyroidism: Graves’ antibodies can cross the placenta and stimulate the baby’s thyroid gland
- Newborn hyperthyroidism: These antibodies can continue to affect the baby after birth, sometimes causing temporary hyperthyroidism that requires monitoring and treatment
Untreated Graves’ disease can increase risks such as high blood pressure, pre-eclampsia, early birth, poor foetal growth and, in severe cases, thyroid storm.
How is Graves’ Disease Managed During Pregnancy?
Treatment is individualised according to the severity of hyperthyroidism and the stage of pregnancy. The main aim is to control the mother's thyroid hormone levels while avoiding unnecessary exposure of the baby to medication.Anti-Thyroid Medicines
Anti-thyroid medicines may be prescribed when medication is required. Doctors generally use the lowest effective dose needed to control the condition. Propylthiouracil (PTU) is generally preferred during the trimester because certain other anti-thyroid medicines have a greater risk of causing birth defects during early pregnancy. Treatment may be changed later in pregnancy depending on the woman’s condition and the doctor’s assessment.Dr Nishchitha K emphasises that medication should never be stopped or changed without medical advice. Maintaining appropriate thyroid hormone levels is important for both maternal and foetal health.
Regular Thyroid Testing
Thyroid function tests need to be checked regularly throughout pregnancy. These tests help doctors determine whether treatment needs to be adjusted. The woman’s symptoms, thyroid hormone levels, and stage of pregnancy are considered when making treatment decisions.Checking Thyroid Antibodies
Doctors may also recommend testing for TSH receptor antibodies (TRAb). These antibodies can cross the placenta and affect the baby's thyroid. Women with a history of Graves’ disease may therefore need additional monitoring during pregnancy, even if their thyroid function is currently normal.Can Women With Graves’ Disease Have a Healthy Pregnancy?
Yes, with appropriate treatment and regular medical follow-up, most women with Graves’ disease can have a healthy pregnancy. Ideally, women who are planning to conceive should speak with an endocrinologist before pregnancy.Pregnancy assessment allows doctors to review thyroid hormone levels, medications, and antibody status and make any necessary changes before conception.
When Should You Seek Medical Help?
Seek medical advice promptly if you have Graves’ disease during pregnancy and notice new or worsening symptoms. Serious situations include:- Worsening symptoms: Increased palpitations, tremors, sweating, or unexplained weight loss
- Breathing problems: Breathlessness, chest pain, or a persistently fast heartbeat
- Severe symptoms: High fever, confusion, or extreme weakness require urgent care
- Pregnancy concerns: Reduced foetal movements, bleeding, or painful contractions
- Medication issues: Side effects or difficulty taking prescribed medicines
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FAQs on Graves’ Disease in Pregnancy: What Are the Risks & How Is It Managed?
- Can Graves’ disease affect breastfeeding?
Yes, Graves’ disease can sometimes affect breastfeeding, mainly because of thyroid hormone levels, and some antithyroid medicines may influence milk production or the baby. However, with proper treatment and monitoring, many women can breastfeed safely. - Is radioactive iodine treatment safe during pregnancy?
No, radioactive iodine treatment is not used during pregnancy because it can cross the placenta and damage the baby's developing thyroid gland. Treatment options should be discussed before conception whenever possible. - Can Graves' disease cause miscarriage?
Yes, uncontrolled Graves’ disease may increase the risk of miscarriage. Proper thyroid management before and during pregnancy, along with regular medical monitoring, can help support a healthier pregnancy.