Teresa Heinz Kerry, 74, has been moved to a Boston hospital from the Nantucket Cottage Hospital, where she was initially admitted on Sunday.
Heinz Kerry grabbed headlines at the start of the convention after telling a reporter to "shove it" when he questioned her about a speech she had given.
John Kerry, the veteran American politician and 2004 presidential candidate, has been sworn in as the United States secretary of state, replacing Hillary Clinton.
