The Queen is under medical supervision at Balmoral Castle in Scotland, after doctors became concerned for her health, Buckingham Palace has said.
All of her four children, and Prince William are in Scotland to be with her.
"Following further evaluation this morning, the Queen’s doctors are concerned for Her Majesty’s health and have recommended she remain under medical supervision," a statement said.
The Queen is "comfortable", it added.
It is very unusual for Buckingham Palace to put out a statement like this – it is usually unwilling to provide a commentary on the 96-year-old monarch’s medical matters, which are seen as private.
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