"The Duke of Edinburgh travelled from Norfolk this morning to the King Edward VII Hospital in London for observation and treatment in relation to a pre-existing condition," read a statement from the palace.
Photos of a frail Prince Philip leaving hospital in London have emerged.
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The royal is expected to head straight to Sandringham to meet The Queen.
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"The admission is a precautionary measure, on the advice of His Royal Highness' Doctor."
The Daily Mail reports the prince had been "battling a flu-like illness for weeks" and suffered a fall before being rushed to hospital.
The Daily Mail reports the prince had been "battling a flu-like illness for weeks".
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"The Duke has had a bad turn recently and has been looking much frailer of late," one source told Daily Mail.
"He's a remarkable man who has always prided himself on how robust he is, but he is six months off his 99th birthday and age takes its toll."
With Philip home in time for Christmas Day, the palace is no doubt breathing a sigh of relief.
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With Philip home in time for Christmas Day, the palace is no doubt breathing a sigh of relief. After all, Queen Elizabeth had to cancel some of the family's other annual traditional holiday activities due to his illness.