The Duke of Edinburgh has been taken to hospital as a "precautionary measure", Buckingham Palace has said.
Prince Philip was taken to Aberdeen Royal Infirmary this afternoon, the palace said.
The nature of his illness was not disclosed.
It comes after he spent five nights in hospital with a bladder infection following the Diamond Jubilee Pageant on the River Thames.
He was discharged from London's King Edward VII just in time for his 91st birthday in June, but his treatment meant the Queen spent some of her jubilee celebrations without him by her side.
In the past year he has also been treated for a blocked coronary artery following chest pains.
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