While death due to hyperemesis is rare, morbidity can be significant if the condition is not properly managed, not to mention the psychological impact that prompts some women to consider termination of pregnancy. Wernicke encephalopathy is caused by vitamin B1 deficiency as a result of persistent vomiting leading to nutrition deprivation and has resulted in permanent neurological disability and death. As such, it is important that treatment, particularly on admission, include hydration and replacement of the B vitamin, thiamine, and attention to electrolyte balance. When replacing fluid care should be taken in overcorrection of severe and prolonged hyponatremia (