Former US first lady in hospital
Former president George H.W. Bush said in a statement that she had been admitted to Houston Methodist Hospital on Monday.
The statement said the 88-year-old, who is the mother of former president George W. Bush, was "in great spirits".
Barbara Bush had heart surgery in March 2009 for a severe narrowing of the main heart valve.
She also had an operation on a perforated ulcer in November 2008.