The prince was driven from Windsor to King Edward VII Hospital.
Prince Philip, Duke of Edinburgh, was admitted to a London hospital, Buckingham Palace announced on Wednesday.
Queen Elizabeth’s 99-year-old husband was driven from Windsor, England, to King Edward VII Hospital in London on Tuesday night, the palace said.
“Admitting the duke is a precautionary measure, on the advice of His Royal Highness’s doctor, after feeling bad,” the palace said in a statement. “The duke must remain in the hospital for a few days of observation and rest.”
Prince Philip’s hospitalization was not an emergency admission and he entered the hospital unaided, a real source told ABC News.
The disease is not related to COVID-19 and staying in the hospital is purely preventive. Philip had not been feeling well for a short time and the doctor was called, according to the real source.
Prince Philip and Queen Elizabeth, 94, received their first COVID-19 vaccinations in January.
While Philip is hospitalized in London, Queen Elizabeth remains at Windsor Castle, where she has been with her husband during most of the coronavirus pandemic.
The queen and Filipe celebrated their 73rd wedding anniversary in November.
“There can be no doubt that the queen and family will be concerned, but the palace is saying that this is a precautionary measure and it is not the first time that he has been hospitalized in recent years in a similar way,” said ABC News royal contributor Victoria Murphy.
Prince Philip was last hospitalized in December 2019, when he was taken to King Edward VII Hospital for “observation and treatment for a pre-existing condition,” the palace said in a statement at the time.
He retired from official royal duties in 2017.
He had completed 22,220 solo engagements since 1952, given 5,496 speeches on his travels to more than 76 countries, wrote 14 books, served as a patron for 785 organizations and made 637 solo visits abroad, according to Buckingham Palace.