Her doctors have advised the queen to rest for at least two weeks.
This means the 95-year-old monarch will not make any official visits in the near future, Buckingham Palace said.
But she may be allowed to continue with some light desk chores, including video virtual appearances from her home at Windsor Castle.
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The Queen was due to attend the Feast of Remembrance on Saturday, November 13th, but will no longer appear.
But it is their “firm intention” to attend the National Memorial Service on Memorial Sunday, November 14th.
In a statement, Buckingham Palace said: “Following her recent advice that the Queen should rest for a few days, Her Majesty’s doctors have recommended that she should continue to rest for at least the next two weeks.
“Doctors have indicated that Her Majesty may continue to perform light desk duties during this time, including some virtual audiences, but no official visits.
“Her Majesty regrets that she will not be able to attend the commemoration on Saturday November 13th.
“However, it remains the Queen’s firm intention to attend the National Memorial Service on Memorial Sunday, November 14th.”
The queen is believed to remain in a good mood and medical advice is considered a sensible precaution.