Updated — Dec. 30, 12:35 p.m. ET
The former president's post-White House spokesperson and speechwriter tweeted the news this afternoon, adding that Mr. and Mrs. Bush "wish to thank everyone for their good wishes and prayers."
Updated — Dec. 29, 4:06 p.m. ET
The 41st president of the United States was taken by ambulance to the Methodist Hospital in Houston on Dec. 23. Spokesperson Jim McGrath said in a statement that the former president was transported "as a precaution" after experiencing shortness of breath earlier that evening.
On Monday, McGrath said that Bush's breathing had returned to normal, but he would remain at the hospital overnight pending final approval from his doctors to go home.
Bush and his wife, Barbara, "wish to thank everyone for their good wishes and prayers," McGrath tweeted.
Shortly after the former president was hospitalized, Bush's office said his prognosis was "positive" and was in good spirits. The statement added that his wife, son Neil, and daughter-in-law Maria Bush visited him on Christmas Day and that he "received well wishes from family, friends, and fellow citizens."
The former president and his wife watched the Houston Texans football game Sunday from the hospital and sent their congratulations to coach Bill O'Brien for a winning season.
In 1991, Bush went to the hospital for health problems related to his irregular heartbeat. Doctors diagnosed the condition as Graves' disease, which is an autoimmune disorder that impacts the thyroid.
He again went to the hospital in February 2000 for a recurrence of the irregular heartbeat. He was released after one night.
Two years ago, Bush spent two months in Methodist Hospital in Houston for bronchitis and a chronic cough. The hospital discharged him in January 2013.
His family revealed publicly that he is no longer able to walk unassisted, which has been a great frustration for him, as he loved outdoor activities.
In June, he celebrated his 90th birthday by jumping out of a plane with a red, white, and blue parachute near his summer home in Maine.
President Obama and First Lady Michelle sent "their good wishes" to Bush after learning he had been hospitalized.
"The President has been made aware that President Bush was admitted to the hospital," the White House said in a statement. "President Obama and the First Lady send their good wishes to the former President and the entire Bush family during this holiday season."
This is a developing story. Check back for updates and follow BuzzFeed News on Twitter.
Michelle Broder Van Dyke is a reporter and night editor for BuzzFeed News and is based in Hawaii.
Contact Michelle Broder Van Dyke at email@example.com.
Jason Wells is deputy news director for BuzzFeed News and is based in Los Angeles.
Contact Jason Wells at firstname.lastname@example.org.
Got a confidential tip? Submit it here.