Democratic presidential nominee Hillary Clinton said she was feeling "great" as she greeted the press after emerging from her daughter's apartment building.
Earlier on Sunday Clinton became "overheated" at a Sept. 11 memorial ceremony in New York City and departed the event early, according to a campaign spokesman.
She left around 90 minutes into the ceremony.
Her Republican rival Donald Trump repeatedly has raised questions about Clinton's health and whether she had the energy to serve as president.
In December 2012, Clinton, 68, suffered a concussion and shortly afterward had a blood clot.