The Queen is known for her strong constitution and no-fuss approach to her infrequent illnesses. A sprained back has caused her to miss the Remembrance Sunday event at the Cenotaph on Sunday, to her "great regret", according to Buckingham Palace.
It would have been her first in-person appearance since a reception for business leaders at Windsor Castle on October 19, after which she cancelled a trip to Northern Ireland on medical advice and spent a night in hospital.
Her doctors last month recommended she rest for two weeks following the 95-year-old monarch's overnight stay at King Edward VII's Hospital, which was her first in eight years.
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