Answer
Hyperemesis gravidarum is a rare complication of pregnancy that can cause severe nausea and vomiting. It is believed to be caused by changes in hormones during pregnancy. Symptoms can range from mild to severe and can lead to dehydration, electrolyte imbalance, and weight loss. In severe cases, hyperemesis gravidarum can be fatal. Charlotte's symptoms of severe nausea and vomiting are consistent with hyperemesis gravidarum.