If you've listened to any of Robert F. Kennedy Jr.'s public appearances, you may have noticed a quiver in his voice when he speaks. That's the result of a rare neurological condition known as ...

The health secretary has previously shared how spasmodic dysphonia, a neurological voice disorder, impacts his speech and causes a "tremble." ...

If you pay attention to the news, you've likely heard Robert F. Kennedy Jr. speaking and wonder what the story was, well, science has an answer.