Can I have a thyroid condition during pregnancy and not even know it?

I’m pregnant and I’ve heard you can have a dangerous thyroid condition and not even know it. What should I know?

Gestational hypothyroidism, or an underactive thyroid condition during pregnancy, is a serious issue. Research suggests that an underactive thyroid during pregnancy can cause a range of medical complications for women and their babies. For mothers, these include miscarriage and diabetes in pregnancy. For infants, the condition is associated with low birth-weight and potentially lower IQ.A: Gestational hypothyroidism, or underactive thyroid during pregnancy, is a serious issue. Research suggests that an underactive thyroid during pregnancy can cause a range of medical complications for women and their babies. For mothers, these include miscarriage and diabetes in pregnancy. For infants, the condition is associated with low birth-weight and potentially lower IQ.A: Gestational hypothyroidism, or underactive thyroid during pregnancy, is a serious issue. Research suggests that an underactive thyroid during pregnancy can cause a range of medical complications for women and their babies. For mothers, these include miscarriage and diabetes in pregnancy. For infants, the condition is associated with low birth-weight and potentially lower IQ.