The Queen did not attend the Remembrance Sunday service at the Cenotaph in London today, Buckingham Palace has announced.
According to the palace the monarch has sprained her back and is thought to be "disappointed'' to miss the event.
In a statement, the palace said it was with "great regret" that the 95-year-old would be unable to attend the service.
The statement said: "The Queen, having sprained her back, has decided this morning with great regret that she will not be able to attend today's Remembrance Sunday service at the Cenotaph. Her Majesty is disappointed that she will miss the service.
"As in previous years, a wreath will be laid on Her Majesty's behalf by The Prince of Wales.
"His Royal Highness, along with the Duchess of Cornwall, the Duke and Duchess of Cambridge, the Earl and Countess of Wessex, the Princess Royal and Vice Admiral Sir Tim Laurence, the Duke and Duchess of Gloucester, the Duke of Kent and Princess Alexandra will be present at the Cenotaph today as planned."
It is understood it is a recent sprain and there were concerns over the impact of a car journey and a period of standing on her recovery.
The Queen is said to be deeply disappointed over her absence and she will remain at Windsor Castle.
Baroness Scotland, the Commonwealth secretary-general, said there would be "sadness" the Queen had to pull out of attending the Remembrance Sunday service.
The peer said "everyone will be wishing her well" after Buckingham Palace announced the 95-year-old had sprained her back.
Put to her on Sky News' Trevor Phillips On Sunday programme that it would be "disappointing" for many veterans not to have the monarch able to attend, Baroness Scotland said: "Absolutely.
"The Queen is adored, rightly. She has shown total commitment to the Commonwealth and she is much loved.
"So, an opportunity like this, to see her and to pay homage for what she herself also did, because people do forget that she was an engineer, she was making her contribution as well.
"I think there will be a lot of sadness but everyone will be wishing her well, everyone will want to see her again. She is the beating heart of most of the love that is in the Commonwealth, so we do wish her well."
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