What is known about former first lady Barbara Bush's health

Former first lady Barbara Bush is receiving "comfort care" at her family's home in Houston after deciding she wanted no further medical treatment for unspecified health problems.

The 92-year-old has suffered from congestive heart failure and chronic obstructive pulmonary disease in recent years, and had surgery in 2009 for severe narrowing of her main heart valve. She also has been treated for decades for a thyroid condition called Graves' disease, and had surgery on a perforated ulcer in 2008.

A family spokesman did not elaborate on whether there were other health problems.

President Donald J. Trump on Flying the Flag at Half-Staff for the Passing of Barbara Bush

On this solemn day, we mourn the loss of Barbara Bush, an outstanding and memorable woman of character. As a wife, mother, grandmother, great-grandmother, military spouse, and former First Lady, Mrs. Bush was an advocate of the American family. Mrs. Bush lived a life that reminds us always to cherish our relationships with friends, family, and all acquaintances. In the spirit of the memory of Mrs. Bush, may we always remember to be kind to one another and to put the care of others first.

As a mark of respect for the memory of Barbara Bush, I hereby order, by the authority vested in me by the Constitution and the laws of the United States of America, that the flag of the United States shall be flown at half-staff at the White House and upon all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions until sunset, on the day of interment. I also direct that the flag shall be flown at half-staff for the same period at all United States embassies, legations, consular offices, and other facilities abroad, including all military facilities and naval vessels and stations.