Lowery was the keynote speaker at a service to mark Ebenezer's 123rd anniversary. Called "America's Freedom Church," the Rev. Martin Luther King Jr. preached there from 1960 until his death in 1968.
The 88-year-old had preached for about 40 minutes, said the Rev. Raphael G. Warnock, senior pastor at Ebenezer.
"He was shaking hands and he just became a little weak and lost his balance," Warnock said. "Within moments, he was able to respond to questions."
Warnock said doctors in the congregation took a look at Lowery before the paramedics were called as a precaution. Warnock accompanied Lowery to the hospital and said he was doing fine Sunday evening.
"I think he just overdid it," Warnock said. "By 5 p.m., he was sitting there talking to me, eating Mary Mac's Southern cooking."
Lowery's condition was not immediately available, but Warnock said he was expected to be released from the hospital today.