Morning sickness of pregnancy: more than meets the eye.

Wernicke's encephalopathy (WE) is a rare life-threatening complication following severe hyperemesis gravidarum. Early recognition of this condition and prompt thiamine administration is the key to preventing devastating sequelae. We report a successful delivery of a small-for-gestational-age (SGA) baby by a patient with WE and thyrotoxicosis in pregnancy.