Long before it became an issue in the 2016 campaign, the health of Democratic presidential nominee Hillary Clinton concerned two senior staffers, emails just released by Wikileaks reveal.

Clinton campaign chairman John Podesta asked in a September 26, 2015 e-mail, “How bad is her head?” The question was the only thing he asked campaign spokesperson Jennifer Palmieri in the message, which had the subject line, “Any sense of whether and when she wants to talk?”

Palmieri responded: “Don’t know. Huma left here about an hour ago. I just pinged again to ask about prep, haven’t heard back. She leaves at 6 pm for DC.”

That exchange was preceded by more than five months by an e-mail from close Clinton aide Huma Abedin. In a lengthy exchange about a Super PAC used by soon-to-be Republican presidential candidate Jeb Bush and how the campaign should talk about “dark money in politics,” Abedin told Podesta, Palmieri, campaign manager Robby Mook and others, “She’s going to stick to notes a little closer this am, still not perfect in her head.”

Clinton’s only official event that day, according to the campaign’s website, was a roundtable event in New Hampshire.

It is unclear what spurred Abedin’s comment. She may have meant only that Clinton did not have had her notes memorized or was tired —or she may have been expressing a larger concern with Clinton’s health.

The health of both elderly candidates has been an undercurrent of the 2016 presidential season. Trump is 70, and has released relatively little information about his health. A year younger, Clinton has fallen on multiple occasions in the last seven years, including a very public collapse in September that her campaign attributed to pneumonia and exhaustion. Clinton also had a concussion in 2012, and broke fractured her arm in 2009.

Clinton has been targeted by Wikileaks for some time, including a release this week that showed her staffers were concerned that President Barack Obama may have lied when he said in early 2015 that he found out from the news that his former Secretary of State was improperly and illegally using a private server. Obama had exchanged e-mails with Clinton on the server before making the comments.

The Clinton campaign has steadfastly refused to address the information revealed by the many Wikileaks releases, declaring them untrustworthy because they were illegally procured and possibly tied to the Russian government.