Updated

Sen. Ted Kennedy left Washington Hospital Center Wednesday morning as expected, one day after he suffered a series of seizures during President Obama's inaugural luncheon.

Kennedy's spirits are good and doctors want him to get some rest, a Kennedy spokeswoman said. She did not say whether the Democrat was headed back home to Massachusetts to rest or is staying in his Washington home.

Doctors blamed fatigue for the seizure. Kennedy has been under treatment for a brain tumor diagnosed last May. He has been treated with surgery, radiation and chemotherapy.

Kennedy's seizure at the inaugural lunch was witnessed by fellow senators. Longtime friend Sen. Chris Dodd, D-Conn., quoted Kennedy as saying, "I'll be OK, I'll see you later" as he was put into an ambulance on Tuesday.

Kennedy had appeared in good health and spirits a few hours earlier when he stepped out of the Capitol and onto the inauguration platform where Obama took the oath of office. At the luncheon, Obama told lawmakers his prayers were with the senator and his family.

Kennedy has pledged to forge a breakthrough on health care reform working with Obama and Democrats who control Congress. Kennedy has been a leading champion of health care reform for decades.

A doctor not connected with the senator's care, Dr. Matthew Ewend, neurosurgery chief at the University of North Carolina, said it's not unusual for patients recovering from brain tumors to suffer seizures.

FOX News' Trish Turner and The Associated Press contributed to this report.