How will my thyroid problem affect my milk supply?
The thyroid is a gland in the front of the neck that produces important hormones. Diseases of the thyroid, such as postpartum thyroiditis, which develops after delivering a baby, can cause abnormal hormone levels. Low thyroid levels have been shown to decrease milk supply, but once a mother receives treatment, the milk supply may increase. A breastfeeding mother who is newly diagnosed with postpartum thyroiditis or other thyroid diseases and has a baby who is growing normally should not see any decrease in milk supply if treatment is started with ongoing monitoring. Mothers with stable, long-standing thyroid problems that are monitored should not expect their condition to impact breastfeeding. While rare, it is possible for high levels of thyroid hormones to cause a large milk supply. While medication used to treat thyroid problems can be safely used by breastfeeding mothers, mothers should not breastfeed if receiving treatment with certain radioactive agents.