KUALA LUMPUR - MALAYSIAN Prime Minister Najib Razak, who was diagnosed last week with chickenpox, has been hospitalised with mild ulcers and gastritis, officials said on Friday.

Health Ministry director general Ismail Merican said Mr Najib was admitted late on Thursday for medical investigations after suffering abdominal discomfort.

An endoscopy revealed superficial ulcers and mild gastritis - an inflammation of the stomach lining - and he is expected to remain in hospital for a few days.

Mr Ismail said that chickenpox was sometimes associated with gastritis. 'It can occur,' he told AFP, describing Mr Najib's condition as 'stable'.

The health department chief told state news agency Bernama that the prime minister has been 'started on treatment and is recovering well'.

Mr Najib came down with chickenpox during an Asian summit in Vietnam last weekend. He missed meetings with US Secretary of State Hillary Clinton and Australia's Prime Minister Julia Gillard.

Najib hospitalised for gastritis