The prince, 98, retired from royal duties in August 2017 after spending decades supporting Queen Elizabeth II, his wife of 72 years.
The Duke is expected to be in hospital for a few days and it has been confirmed that was not taken by ambulance, with his visit a previously planned admission.
"The admission is a precautionary measure, on the advice of His Royal Highness' Doctor", it said.
He had been at the Royal family's Sandringham estate in eastern England.
The Duke of Edinburgh has been taken to a London hospital from Norfolk. But, she had to let the world know that the Duke of Edinburgh has been her "strength and stay all these years".
The news comes after the Queen was spotted making her way to Sandringham to begin her Christmas break.
The Queen then caught the train from King's Cross to King's Lynn in Norfolk on Friday.
"The King Edward VII is the hospital that is always used by the royal family".
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In the past, Philip has received hospital treatment for bladder infections and was admitted to King Edward VII Hospital with this condition in June 2012.
The Imperial State Crown was placed on a cushion beside her as she delivered her speech, which outlines the government's plans for the coming year.
Her Majesty normally returns to her Norfolk home on a Thursday, a day after her annual pre-Christmas lunch with relatives who don't join her at Sandringham for the festive season.
Since 1952, The Duke of Edinburgh carried out thousands of appearances alongside Her Majesty.
Previous year he canceled his appearance at the Maundy church service at the very last minute, and he also skipped out on Easter Sunday services.
On Dec 23, 2011, while at Sandringham for Christmas, the royal patriarch suffered chest pains and spent four days in hospital for a successful coronary angioplasty and stenting.
Philip was forced to give up driving earlier this year, at the age of 97, after smashing into a auto while driving a Land Rover near Sandringham in January.