LONDON, ENGLAND - DECEMBER 21: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit homeless charity 'Centrepoint' at its Camberwell Foyer on December 21, 2011 in London, England. (Photo by Chris Jackson/Getty Images)
The good news for the Royal Family is that Kate Middleton is pregnant. The bad news? She's in the hospital with a very severe form of morning sickness called Hyperemesis Gravidarum.
It's marked by nausea and vomiting, but on a more extreme scale than regular morning sickness . . . to the point where it can lead to dehydration, malnutrition, weight loss and other problems.
It's estimated that at most, only 2% of pregnant women get it. Some estimates say the number is as low as three-tenths of a percent. For most women, the issue resolves itself by about the 20th week of pregnancy.
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