During a recent Bernie Sanders speech at one of her rallies, Hillary Clinton is unable to stop shaking her head. At first glance, it looks like she’s shaking her head in agreement with Sanders, but after a few minutes of the same awkward head-shake movement, it becomes obvious that this shaking is involuntary.

Could this involuntary head movement be a symptom of Parkinson’s?

At times during the video she can be seen grabbing her chair with both hands, trying hard to stop shaking. Other times she’s seen taking a deep breath and concentrating on stopping the head movements.

Watch the video and judge for yourself.

In the above version, there’s no audio, and it’s been edited to only the parts of the head movement, which amount to about 10 minutes of shaking. If you’d like to take a look at the unedited version of Bernie Sander’s speech (Hillary Clinton Rally in Durham, New Hampshire (9/28/2016)), you can watch it here: https://youtu.be/6DDgUBFRbJo