Hillary Clinton is being treated for pneumonia and dehydration, her doctor said on Sunday, hours after she abruptly left a ceremony in New York honoring the 15th anniversary of the Sept. 11 attacks and had to be helped into a van by Secret Service agents.
The incident, which occurred after months of questions about her health from her Republican opponent, Donald J. Trump, and his campaign, is likely to increase pressure on Mrs. Clinton to address the issue and release detailed medical records, which she has so far declined to do.
Mrs. Clinton was taken from the morning event at ground zero to the Manhattan apartment of her daughter, Chelsea. About 90 minutes after arriving there, Mrs. Clinton emerged from the apartment in New York’s Flatiron district. She waved to onlookers and posed for pictures with a little girl on the sidewalk.
“I’m feeling great,” Mrs. Clinton said. “It’s a beautiful day in New York.”
Mrs. Clinton left in her motorcade without the group of reporters that is designated to travel with her in public. A campaign spokesman, Nick Merrill, indicated that she had returned to her Chappaqua, N.Y., residence sometime after 1 p.m., and Mrs. Clinton was not seen publicly the rest of the day.
Mr. Merrill initially described Mrs. Clinton, the Democratic presidential nominee, as feeling “overheated” at the commemoration ceremony.
But just after 5 p.m., a campaign official said Mrs. Clinton’s physician, Dr. Lisa R. Bardack, had examined the candidate at her home in Chappaqua, and Dr. Bardack said in a statement that Mrs. Clinton was “rehydrated and recovering nicely.”
“Secretary Clinton has been experiencing a cough related to allergies,” Dr. Bardack’s statement said, adding that on Friday morning, after a prolonged cough, Mrs. Clinton was given a diagnosis of pneumonia.
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“She was put on antibiotics, and advised to rest and modify her schedule,” Dr. Bardack added. “At this morning’s event, she became overheated and dehydrated.”
Dr. Bardack did not indicate what sort of pneumonia Mrs. Clinton had or elaborate on the nature of the examination last week, whether Mrs. Clinton had a fever today, or a host of other issues that could offer more precise insights about her condition.
Late Sunday night, Mrs. Clinton’s campaign said she was canceling her plans to travel to California on Monday for what had been a planned two-day trip there.
A video of Mrs. Clinton taken by an attendee at the ceremony captured what appeared to be her legs buckling as she struggled to steady herself and walk to her van. She required assistance from two Secret Service agents, who held her on either side, to move off a curb and into the van.
Hillary Clinton as she left her daughter Chelsea’s apartment in New York on Sunday. Credit Eric Thayer for The New York Times
Close-up images revealed that her feet were dragging as she was hoisted into the vehicle.
The episode thrust questions about Mrs. Clinton’s health and the transparency of her campaign squarely into the last two months of the race, which many polls show has grown tighter. For months Republicans have, with scarce evidence, questioned the stamina of Mrs. Clinton, 68, and claimed she is ill, often pointing to her repeated coughing bouts.
She has brushed off such claims. Mrs. Clinton and Mr. Trump, 70, have shared substantially less information about their health than some previous presidential candidates.
And Mrs. Clinton revealed that she had pneumonia and had been prescribed medication only after the startling video emerged of her being unable to walk under her own volition after the ceremony.
Her campaign initially did not offer any information about why she had left early or her whereabouts. Twice during the day, she abandoned the group of reporters assigned to cover her public movements. Campaign officials did not respond to multiple inquiries about whether Mrs. Clinton had been treated by a doctor or had taken any medications.
Even some members of Mrs. Clinton’s campaign staff had been unaware of her recent diagnosis. Huma Abedin, Mrs. Clinton’s long-time aide, sent an email to the full campaign staff on Sunday that included the doctor’s note, to share with them “the full picture.”
“Onward as H.R.C. would say,” Ms. Abedin wrote in the message, the contents of which were disclosed by a Clinton aide who requested anonymity to share an internal campaign email.
Temperatures were in the high 70s on Sunday morning in New York, and humidity was high. Mr. Trump also attended the ceremony, as did many other dignitaries.
Other attendees at the event said afterward that Mrs. Clinton had not appeared ill when she first arrived at the former site of the World Trade Center.
“She seemed fine,” said Representative Peter T. King of New York, a Republican, who recalled speaking briefly with Mrs. Clinton around 8:30 a.m.
But about an hour later there was a minor commotion, Mr. King said. A number of New York’s current and former elected officials had been standing in silence as the names of the victims of the attacks were read. Suddenly, Mrs. Clinton, a former New York senator, left her position.
Mrs. Clinton emerged last week from an August mostly focused on private fund-raisers with campaign events in Ohio, Illinois, Florida, North Carolina and Missouri. On Wednesday, she participated in an NBC forum on national security, and on Friday she attended a Manhattan fund-raiser where she characterized half of Mr. Trump’s supporters as a “basket of deplorables.”