Hillary Clinton appears on Jimmy Kimmel on ABC on Monday, August 22, 2016. (RANDY HOLMES/ABC )

Hillary Clinton had a few late night laughs at the expense of conspiracy theorists who have been pushing rumors about her health in right-wing circles on the Internet.

Appearing on "Jimmy Kimmel Live!" on Monday night, Clinton jokingly demonstrated her strength and good health, asking Kimmel to take her pulse and opening a pickle jar on set.

"Take my pulse while I'm talking to you — make sure I'm alive," Clinton joked.

"Oh my God, there's nothing there!" Kimmel said.

The theories began online but have trickled up to Donald Trump and his allies on the campaign trail.

Trump regularly suggests that Clinton does not have the "mental and physical stamina" to be president. And former New York mayor Rudy Giuliani, a Trump adviser, said this week that he believes that Clinton has "several signs of illness."

"Back in October the National Enquirer said I'd be dead in six months. So with every breath I take I feel like it's a repudiation," Clinton said. "I don't know why they are saying this. On the one hand it's part of the wacky strategy—just say all these crazy things and maybe you can get some people to believe you. On the other hand it just absolutely makes no sense.

"I don't go around questioning Donald Trump's health; as far as I can tell he's healthy as a horse," Clinton said.