The 98-year-old has been taken to the hospital as a precaution for the treatment of an existing condition.
The Duke of Edinburgh has been admitted to the King Edward VII Hospital in London where he will remain under observation for a few days.
Prince Phillip is said to have walked into the hospital unaided and sources say this is part of a planned visit rather than a sudden admission.
This comes as the Queen arrived at Sandringham, where members of the royal family gather for Christmas every year.
US and Iran having 'very good discussions', Trump says
Projectile sinks Indian ship near Yemeni waters; all seafarers safe
Albanian firefighters battle blazes as southern and eastern Europe feels the heat
Russia kills 17 in heavy ballistic hit on Ukraine, destroys warehouses, logistics
Plane tyre bursts on landing at Cape Town airport, disrupting flights
