The Palace confirmed Prince Philip, 98, had been residing at the Royal Family's Sandringham estate, and left on Friday morning without Her Majesty.
The Duke of Edinburgh is expected to stay in hospital for a few more days while receiving treatment relating to a "pre-existing condition".
The Duke of Edinburgh has travelled from Norfolk to the King Edward VII Hospital in London as a "precautionary measure", Buckingham Palace has said.
It is not clear if Philip will be released in time to join the rest of the royal family for Christmas at Sandringham, the queen's country estate in Norfolk.
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"The admission is a precautionary measure, on the advice of His Royal Highness' doctor", a palace statement read. Prince Philip is expected to remain in hospital for a number of days. "It was a deliberate admission, and he walked into the hospital unaided", the supply mentioned.
Since retiring from official solo royal duties in 2017, the duke has appeared in public alongside the Queen and other members of the Royal Family at events and church services.
Pictured: The Queen, Prince Philip during the wedding ceremony of Britain's Prince Harry, Duke of Sussex and United States actress Meghan Markle in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018.
However, it is claimed that the Queen's husband was taken by helicopter after struggling with health problems in recent weeks. Philip additionally skipped Easter Sunday providers final 12 months forward of the announcement that he underwent hip substitute surgical procedure.
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The queen has not altered her holiday routine and went to church on Sunday as normal.
The Queen knows that if her husband stays near her and in the center of the royal life, he will be obliged to get involve and that will defeat the goal of his retirement. Sign up for our newsletter to get the latest updates on Kate Middleton, Meghan Markle and more!
It is thought festivities will include the family's traditional Christmas Day church service held at St Mary Magdalene Church.
The desserts will be centerpieces at the Legion Christmas get-togethers in 2020, as part of their new Together at Christmas initiative to provide extra support to the Armed Forces community around the holidays.
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