In a statement, the palace said she had been advised to avoid official visits and to only undertake "light, desk-based duties."
The queen would therefore be unable to attend a Festival of Remembrance honoring those who have served Britain and the Commonwealth scheduled to take place Nov. 13, the statement added.
However, it said, she had a "firm intention" to attend a national service of remembrance for military veterans the following day.
It comes just over a week after the queen, who at 95 is the world's longest reigning monarch, was forced to spend her first night in a hospital in years, at London’s King Edward VII private hospital.
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The queen stayed overnight after undergoing “preliminary investigations” for an unspecified ailment, which was not related to Covid-19.
Officials said Elizabeth was in good spirits following the visit, and she returned to light duties upon her return to Windsor Castle the next day.
Earlier this week, Buckingham Palace also announced that she would not attend the COP26 Climate Conference in Scotland due to medical advice to rest following her hospital stay.
Prior to the hospital visit, she had also been forced to cancel a trip to Northern Ireland.
The palace said she would be able to continue to hold "some virtual audiences."
She is set to mark her platinum jubilee, celebrating 70 years on the throne, next year and continues to keep a busy schedule of royal duties, even in the months after the death of her husband, Prince Philip, who died at the age of 99 in April.