Hyperthyroidism – or having an overactive thyroid gland – can
pose special concerns during pregnancy. When the body delivers
too much thyroid hormone, both the mother and the baby can
suffer. Miscarriages, premature births, and intrauterine growth
retardation can occur when the disorder goes undiagnosed or
untreated. Pregnant women with hyperthyroidism can also develop
high blood pressure, and are at greater risk of heart
conditions. Many doctors will advise a woman with
hyperthyroidism to get a permanent treatment -- such as
radioactive iodine (RAI) or surgery -- before even trying to get
pregnant. In that case, a woman is actually considered
hypothyroid during pregnancy, and should follow directions for
women with hypothyroidism. Other doctors who are more familiar
with antithyroid drugs may be willing to work with women who
have drug-managed hyperthyroidism. But generally, however, when
the disease is treated properly, most mothers have healthy
pregnancies and babies. The best way to ensure a positive outc