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It seems the world is buzzing with the news that Prince William and Kate Middleton are expecting. but what's really drawing attention is that Kate has been in the hospital for the last couple days with a severe form of morning sickness.

Tuesday we were questioning why she was in the hospital, for something that's so common among pregnant womenbut this isn't your average morning sickness we're talking about.

Cleveland Clinic's Dr. Amy Merlino talks about hyperemesis gravidarum, extreme morning sickness that affects one in 300 pregnant women. It's acomplete intolerance of food or drink.