Methodist Hospital said in a statement announcing the Wednesday release that Bush might have had a mild relapse of Graves disease, a thyroid condition for which she was treated in 1989. Her doctors have adjusted her medication.
The 84-year-old wife of former President George H.W. Bush was hospitalized Saturday after not feeling well for about a week. She was described as not being in any pain or danger.
Mrs. Bush had heart surgery in March 2009 for a severe narrowing of the main heart valve. She also was hospitalized in November 2008, when she underwent surgery for a perforated ulcer.