Earlier, she had received steroids to treat the condition, though her doctor later pulled her off the medication. Long-term use of steroids, too, has been linked to the development of stomach ulcers.
Fortunately, Peters says that now that her perforation has been repaired, it is unlikely that it will recur in that particular spot. And he says that the news that she is resting comfortably is a good omen.
"If 12 to 24 hours out the patient is doing well, the chances are he or she will recuperate just fine."
UPDATE (Thursday 1:37p.m.ET): Mrs. Bush was just moved out of intensive care and into a regular private room. Gina Sunseri and Radha Chitale contributed to this report.