Thyroid storm: hyperemesis and second trimester miscarriage.

Thyroid storm is a rare and life-threatening endocrine emergency. This complication is typically seen in women with a history of thyroid disorders triggered by a stressor such as surgery, trauma or severe illness. In pregnancy, there is significant fetal morbidity including preterm birth or fetal death. We present a case of thyroid storm in the second trimester precipitated by hyperemesis gravidarum and gestational transient thyrotoxicosis which was complicated by maternal collapse, miscarriage and cardiomyopathy.