Hillary Clinton undergoing treatment for pneumonia

Hillary Clinton

NEW YORK (UPI) — Hillary Clinton has been suffering from pneumonia, her doctor said Sunday, hours after the Democratic nominee abruptly left a 9/11 memorial service because she “felt overheated.”

On Friday, Clinton was diagnosed with pneumonia, and “put on antibiotics, and advised to rest and modify her schedule,” Dr. Lisa Bardack said in a statement.

“While at this morning’s event, she became overheated and dehydrated. I have just examined her and she is now re-hydrated and recovering nicely,” said Bardack, chairman of internal medicine at the Mount Kisco Medical Group.

Earlier, her campaign said Clinton was overcome attending a September 11th Commemoration Ceremony in New York for 90 minutes. “During the ceremony, she felt overheated so departed to go to her daughter’s apartment, and is feeling much better,” Clinton campaign spokesman Nick Merrill said in a statement.

A senior law enforcement official told CNN that Clinton came to the ceremony not feeling well, but said she wanted to be there to pay her respects to the victims and families of the 9/11 terrorist attacks.

A video of Clinton’s departure from the event around 9:30 a.m., posted by Twitter user Zdenek Gazda, appears to show her stumbling and being helped into a waiting van.

Clinton left her daughter’s apartment before noon, saying “I’m feeling great, it’s a beautiful day in New York.”

Clinton then went to her home in Chappaqua, N.Y., where she was attended to by Bardack.

In Cleveland last week, Clinton suffered a two-minute coughing fit last week, which she blamed on allergies.

Rep. Joe Crowley, D-N.Y., who stood next to Clinton during the ceremony, told NBC, “It was very hot and stifling, very tight, inches from each other … like typically would be at a ceremony like this.”

The high in lower Manhattan was expected to reach 83 degrees Sunday, according to toThe Weather Channel.

Clinton and her campaign have dismissed recent rumors of ill health. Trump issued her a challenge, in an August tweet, to release her medical records. Trump made no mention of Clinton’s medical situation on Twitter.

The commemoration ceremony at the 9/11 Memorial did not include any public officials speaking. Before the ceremony, however, Clinton spoke, saying “We’ll never forget the horror of September 11, 2001. Let’s honor the lives and the tremendous spirit of the victims and responders.”