Washington  - Former first lady Barbara Bush, 83, underwent tests at hospital after she complained of stomach pains, CNN reported late Tuesday.

Bush, who is also the mother of the current US President George W Bush, was hospitalized in Houston, Texas, Tuesday night, the broadcaster reported, quoting a family spokeswoman.

Jim McGrath, a spokesman for Bush's husband, former President George HW Bush, told CNN that the tests were negative and she was due to be released later Tuesday or Wednesday. (dpa)