The new Prime Minister Liz Truss and leader of the opposition Sir Keir Starmer left the House of Commons abruptly after they were handed notes about the Queen.
A palace spokesperson confirmed Queen Elizabeth is under medical supervision, with doctors concerned for her health shortly after lunchtime on Thursday (September 8).
It comes as the Prince of Wales, Duke of Cambridge and the Duchess of Cornwall made their way to Balmoral in Scotland - where the Queen is currently residing.