The announcement that Kate Middleton, Duchess of Cambridge (and, despite our title, not a princess, like Diana was, for arcane reasons that only experts in Teutonic monarchy understand) is expecting her first child is bringing attention to a little-known pregnancy condition known as hyperemesis gravidarum (HG), a severe form of nausea and vomiting in pregnancy that can be debilitating because it causes serious dehydration and malnutrition. 

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