Buckingham Palace announced on February 5 that King Charles III, 75, was suffering from a “form of cancer”.
The nature of the latter has not been specified, but is not linked to the benign operation he underwent for an enlarged prostate last week.
The sovereign was released on January 29 from the London Clinic, where Kate Middleton was also hospitalized.
To discover
George Clooney: tormented childhood, great love and secret ambitions
Download the Le Figaro Cuisine app for tasty and authentic recipes
Leadership, balance, career, money... A business coaching program for women
The palace says the king, who resides at his Sandringham estate, remains in charge of state affairs.
British Prime Minister Rishi Sunak said he “wishes Her Majesty a speedy and full recovery”: “I have no doubt that he will be back to full fitness very soon, and I know that the country everyone wishes him well.”