Teresa Heinz Kerry, hospitalized Sunday in Boston, continues to improve while doctors try to determine what caused her to suffer symptoms consistent with a seizure while vacationing at her Nantucket home.
Glen Johnson, spokesman for her husband, U.S. Secretary of State John Kerry, said Tuesday that doctors at Massachusetts General Hospital have ruled out possible seizure triggers or other ailments, including a heart attack, stroke or brain tumor.
Her condition was upgraded from serious to fair Monday.
Mrs. Kerry, 74, was hospitalized Sunday afternoon on Nantucket while there with her husband. After being stabilized, she was flown to Boston for further testing.
A medical source told NBC News that Mrs. Kerry suffered a grand mal seizure, a generalized seizure that affects the entire brain, and has been placed on a respirator. Such seizures can be prompted by a stroke or any number of underlying medical conditions.
Mr. Johnson would not address media reports but said only that Mrs. Kerry suffered "seizure-like symptoms."
The family doesn't plan on making any more statements until Mrs. Kerry is released from the hospital.
Mr. Johnson said the outpouring of support for Mrs. Kerry has been "overwhelming" and includes tweets and Facebook postings, flower arrangements, food and messages of comfort from other hospital patients, former staff members, Senate and House colleagues and Mr. Kerry's 2004 presidential campaign team.
"The family has also been touched by messages and phone calls from leaders in foreign governments who know and have worked with the Secretary and Mrs. Heinz Kerry," he said in an email.
Mr. Kerry planned to be in Washington on Tuesday to open a previously scheduled economic and strategy meeting between China and the U.S. and then return to Boston.
Torsten Ove: firstname.lastname@example.org or 412-263-1510.