Physicians at Massachusetts General Hospital have determined that seizure-like symptoms suffered by Teresa Heinz Kerry were not caused by a heart attack, stroke, or brain tumor, according to a statement released today by the office of Secretary of State John F. Kerry.

Heinz Kerry, a leading philanthropist and wife of the former Massachusetts senator, remains in fair condition at Mass. General, the statement from Kerry spokesman Glen Johnson said. She “continues to improve,” Johnson said.

The 74-year-old Heinz Kerry was stricken with symptoms Sunday while vacationing with her husband in Nantucket. Initially, she was ferried to Nantucket Cottage Hospital, where she was stabilized before being transported via private plane to the Boston teaching hospital.

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The secretary of state was expected to travel to Washington today for long-planned meetings on US-China relations.

This is the full text of the statement from Johnson:

“Teresa Heinz Kerry continues to improve and remains in fair condition at Massachusetts General Hospital, while doctors seek the cause of seizure-like symptoms she experienced on Sunday.

“As evaluations continue, she, Secretary of State John Kerry, and their family are deeply grateful that physicians have ruled out a variety of possible triggers or other ailments, including heart attack, stroke, or a brain tumor.

“The family does not anticipate making any further statements until Mrs. Heinz Kerry is discharged from the hospital.

“However, the secretary, his wife, their children, grandchildren, and extended family want to say a profound thank-you to everyone who has reached out and offered their best wishes.

“The well-wishes have been humbling and overwhelming, including tweets and Facebook postings; flower arrangements and offers of food; and messages of comfort from other MGH patients, former staff, Senate and House colleagues, and members of the executive branch, as well as many dear and longtime friends and the secretary’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.

“With his wife’s condition stable and improving, the secretary will briefly travel to Washington today to open the long-planned US-China Strategic & Economic Dialogue. Members of the family will remain at the hospital before the secretary’s return to Boston.”