Former President Joseph R. Biden Jr. spent last Friday at a hospital in Philadelphia after a “small nodule” was discovered on his prostate that required “further evaluation,” according to a spokesman.

It is common for a man of Mr. Biden’s age — he is 82 — to experience prostate issues, and his spokesman declined to elaborate on any additional details about his care.

Mr. Biden left office as the oldest serving president in American history. He was dogged throughout his presidency by concerns about his age and his health, which ultimately led him to abandon his re-election campaign.

In February 2024, when Mr. Biden was still president, his longtime doctor declared him “fit to serve” after he underwent a routine physical at Walter Reed National Military Medical Center.

Mr. Biden has kept a relatively low profile since leaving office in January, but he sat for two interviews last week after Mr. Trump’s first 100 days in office. The day before Mr. Biden was at the hospital in Philadelphia, he and the former first lady, Jill Biden, were in Manhattan for a joint interview on “The View.” Mr. Biden defended his record as president and his mental acuity.

“They are wrong,” Mr. Biden said of reports that he had declined in his final year in office. “There’s nothing to sustain that.”