Presidential candidate Sen. Elizabeth Warren sought to boost striking school workers in Chicago today, but her performance may leave some to wonder if she has an undisclosed ailment.

While addressing teachers and support staff on the picket line at Oscar DePriest Elementary School on the city’s West Side, Warren’s hand was seen repeatedly shaking.

Watch:

“Thank you for all you do every single day,” she told the strikers as her hand began to quiver during the brief remarks. The 70-year-old politician quickly steadied it with her left hand.

Moments later, Warren said, “Our nation looks to you to show how people who fight from the heart, people who are told, ‘Quit now, give up,’ don’t give up, they stay in the fight for what they believe,” she continued, her hand shaking uncontrollably.

“Are you going to fight for our children?” she shouted as her hand once again began to quake.

“And our fight for America’s future. Are you ready to fight for America’s future,” she said, pulling the microphone away from her mouth too early.

“Then we will win and America’s children will win!” she concluded, her hand trembling before she quickly switched hands, holding the mic with the other.

“Thank you!” she ended with a hearty wave.