Former First Lady Barbara Bush was hospitalized on Tuesday after complaining of what a family spokesman called “a little bit of” stomach pain.

Mrs. Bush, 83, went to Methodist Hospital as a precaution, family spokesman Jim McGrath said. On Tuesday, she complained of stomach pain and called her husband, former President George W. Bush, at his office urging him to take her to the hospital. Former President Bush accompanied his wife to the hospital. The couple’s Secret Service detail rushed both to Methodist Hospital. Jim McGrath said all the results for tests she had undergone had been negative. As a precaution, she was being kept overnight.

Barbara Bush told the public that she suffered from Graves disease, an affection of the thyroid. The disease causes teary eyes and double vision. George H.W. Bush came down with Graves disease not long after his wife.

Mrs. Bush was expected to be released Wednesday.

Barbara Pierce met the future president as teenagers during a dance over Christmas vacation. The two became engaged before he went off to World War II as a Navy torpedo bomber pilot. They married on January 6, 1945, after he returned from the war.

As wife of the Vice President and then President, Barbara Bush supported the cause of universal literacy. She called it “the most important issue we have.”

Currently, Mrs. Bush serves on the Boards of AmeriCares and the Mayo Clinic, and heads the Barbara Bush Foundation for Family Literacy.