At minimum, 27 million Americans have thyroid disease. Despite being the majority of thyroid sufferers, women rarely know that thyroid problems increase their risk of pregnancy complications, including infertility, preeclampsia, miscarriage, premature delivery, and low birth weight. This awareness gap affects patients and doctors, who know little about the ramifications of an undiagnosed or under-treated thyroid condition on a mother and her unborn baby.

Founder of HypothyroidMom.com Dana Trentini and thyroid health advocate and bestselling author Mary Shomon have both endured challenges...