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Hyperemesis gravidarum is a rare pregnancy complication characterized by severe nausea and vomiting. It can lead to dehydration, electrolyte imbalances, and weight loss. In severe cases, it can be fatal. Charlotte Brontë is one of the most famous people to have died from hyperemesis gravidarum. She suffered from the condition during her first pregnancy and died at the age of 30 from complications related to it.