King Harald V of Norway was taken to the hospital following an infection, the country's royal household said Tuesday.
The 87-year-old monarch is on a private trip to the South East Asian country.
"His majesty the king has fallen ill during his holiday stay in Malaysia, and is hospitalised there, with an infection. The king receives good care from both Malaysian and Norwegian medical personnel," the royal household said in a statement.
The oldest ruling monarch in Europe, who turned 87 in February, needs crutches to get around and has suffered from a series of ailments and illnesses in recent years, including heart surgery and various respiratory problems and infections.
In late January, Norway's king went on sick leave due to a respiratory infection.
A week before he had dismissed speculation that he might abdicate, following the lead of distant cousin Queen Margrethe II in Denmark.
After repeatedly insisting that she would never step down, Margrethe stunned Danes when she announced in her New Year's Eve address that she would abdicate in favor of her eldest son Frederik.
"I stick by what I've always said, that I swore an oath to the Storting (parliament) and it is for life," said Harald, quoted by Norwegian media.
In his absence, Crown Prince Haakon, 50, steps in as regent.
