Deputy Prime Minister John Prescott has been admitted to hospital with a suspected chest infection.
Mr Prescott, 69, is undergoing tests after feeling unwell. His illness is not thought to be life-threatening.
A statement from Mr Prescott's office said: "He has been admitted to hospital. He is undergoing tests as a result of a suspected chest infection."
In May Mr Prescott announced he would step down as Labour's deputy leader and the contest to replace him continues.