Hillary Clinton abruptly left a 9/11 commemoration ceremony early Sunday morning, but not before video showed her unsteady on her feet, fueling conspiracy theorists who have been speculating wildly on the Democratic presidential nominee's overall physical condition for weeks.

A spokesman initially said she felt "overheated," but by Sunday afternoon, Clinton's doctor released a statement confirming that Clinton was diagnosed with pneumonia, The New York Times reported.

Clinton's doctor said that Clinton was prescribed antibiotics on Friday.

AP Photo/Andrew Harnik - apimages.com

By then, video of Clinton's departure had circulated widely on Twitter.

Before Clinton's diagnosis was confirmed, Clinton spokesman Nick Merrill said in a statement that she was "overheated," NBC News reported.

"Secretary Clinton attended the Sept. 11th Commemoration Ceremony for just an hour and 30 minutes this morning to pay her respects and greet some of the families of the fallen," Merrill said. "During the ceremony, she felt overheated, so [she] departed to go to her daughter's apartment and is feeling much better."

Shortly thereafter, Clinton cheerfully exited her daughter Chelsea's apartment, commented on the temperate weather and added that she was "feeling great."

Nevertheless, various right-wing Clinton watchers and news sites were quick to jump on the events with grotesque — and, in many cases, outright false — stories.

The pages, which have trafficked in conspiratorial murmurs about Clinton's health in recent months, used the moment to congratulate themselves.

Conspiracists have fixated on Clinton's health throughout the election cycle, using images of her sitting on stools and using pillows to suggest that she is covering up some sort of terrible illness, claims that both she and her physician have strongly denied.

Clinton was also verbally accosted by Martin Shrkeli.

Republican presidential nominee Donald Trump, for his part, said he didn't know anything about Clinton's condition.

The Mayo Clinic reported that pneumonia can cause fatigue and is typically cured with a regimen of antibiotics.