Inadequately controlled hypothyroidism in pregnant women is associated with mental retardation and learning difficulties in children. Some forms of hyperthyroidism put a fetus at risk of growing slowly and being at risk for stillbirth. Treatment for hyperthyroidism needs to be monitored carefully to decrease the risk of the fetus developing hypothyroidism. Impact of Pregnancy on Thyroid Metabolism changes in pregnancy sometimes cause a need to change the dose of thyroid medications. The blood tests used to evaluate thyroid function normally change during a pregnancy and need special interpretations.
Some thyroid problems can get worse in the postpartum period.