Thyroid problems and pregnancy – hyperthyroidism

Thyroid problems – Hyperthyroidism (overactive thyroid)

Hyperthyroidism occurs in approximately 0.2% of pregnancies. Poorly controlled hyperthyroidism is associated with an increased risk of preterm delivery and low-birth weight. If you suffer from hyperthyroidism you will be (may be) prescribed an anti-thyroid drug. This drug crosses the placenta so the aim is to use the lowest dose possible to control the condition and prevent any side-effects in your baby. You will probably be seen monthly by an endocrinologist for estimation of your thyroid levels and your medication will be adjusted accordingly.

Unfortunately, diarrhoea can be a problem for women with this condition so it is important to drink plenty of fluids to prevent dehydration.

Your thyroid hormone levels will be measured after your baby is born and your baby’s thyroxin levels may also be measured.

Hypothyroidism (under-active thyroid)
Approximately 0.9% of women suffer from hypothyroidism.

If you suffer from hypothyroidism you will commence on thyroxine in order to normalise thyroid function. Your thyroid function will be monitored every month during pregnancy and your medication adjusted as necessary. Your weight will be monitored closely as women with this condition put on weight easily. Constipation may also be a problem so drink plenty of fluids and eat a high-fibre diet. After your baby is born he or she will (may) have a blood test to measure his thyroid function.