Prince William at King Edward VII Hospital (Getty Images)
LONDON (WUSA) -- Tuesday, Britain's Prince William visited his wife Catherine in the hospital.
Catherine, the Duchess of Cambridge, is in the King Edward VII Hospital suffering from Hyperemesis Gravidarum, an acute morning sickness which causes severe nausea and vomiting. Treatment requires supplementary hydration and nutrients.
The sickness sometimes indicates an expectant mother is carrying twins.
Catherine is expected to be in the hospital for a few more days.
The prince's spokesman said on Monday that she was less than 12 weeks pregnant.