Hillary Clinton’s health has been an issue in the campaign, at least since her bout of pneumonia two weeks ago. But in the first few minutes of Monday night’s debate, Donald Trump was audibly sniffing in the middle of his answers — sometimes several times in a sentence.

And the candidate who mocked his primary opponent Marco Rubio for his thirst during debates ducked out of camera range briefly to reach for a glass of water.

Donald Trump takes a drink of water during the presidential debate on Monday at Hofstra University in Hempstead, N.Y. (Photo: Joe Raedle/Getty Images)

What does it mean? Probably nothing — but there was no shortage of commentary on Twitter.

Trump is sniffling because he's allergic to the Constitution — Colin Jost (@ColinJost) September 27, 2016





Based on information I've read on https://t.co/Bha7mo8FRV, sniffling is a sign of Parkinson's and autism, which Trump definitely has. — Ben Collins (@oneunderscore__) September 27, 2016





Sniffling is the new sighing. #debatenight — Brian Fallon (@brianefallon) September 27, 2016









Trump keeps sniffling and sounds like he has a cold. Many people are saying he's sick. — (((Yair Rosenberg))) (@Yair_Rosenberg) September 27, 2016





Why does Trump keep sniffling? Some people say it's Zika. I don't know, but some people say, is all I'm saying. — Michael Weiss (@michaeldweiss) September 27, 2016



