An analysis of pregnant women with subclinical hypothyroidism suggests that the disorder puts mothers-to-be at increased risk for severe preeclampsia when compared with those who did not have a thyroid disorder. The authors also found that the overall incidence of hypertension was 6.2% in women with subclinical hyperthyroidism, 8.5% in women with no thyroid disorder, and 10.9% in women with subclinical hypothyroidism.

Abstract: Obstetrics & Gynecology, February 2012.