Doctors for Queen Elizabeth II, 96, are "concerned" about her condition and "have recommended that she be placed under medical supervision" at her Balmoral Castle in Scotland, Buckingham Palace said on Thursday.
"Following a further assessment this morning, the Queen's doctors are concerned for Her Majesty's health and have recommended that she remains under medical supervision.
The Queen continues to feel comfortable and at Balmoral,” the palace said in a brief statement.