Kennedy, 69, previously revealed he was diagnosed in his early 40s with a rare neurological condition called spasmodic dysphonia. What is spasmodic dysphonia? Spasmodic dysphonia is a neurological disorder that causes involuntary spasms in the muscles of the voice box, also known as the larynx, according to John Hopkins Medicine. Spasmodic dysphonia may also be inherited, but a specific gene for the disorder has not yet been identified. Other notable people with spasmodic dysphonia include "Hellboy" actress Selma Blair, CBS News correspondent Jeff Pegues, and journalist Diane Rehm.

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Persons: Robert F, Kennedy Jr, spasmodic, John F, Kennedy, favorability, Oprah Winfrey, John Hopkins, Spasmodic, Winfrey, NewsNation, Selma Blair, Jeff Pegues, Diane Rehm Organizations: spasmodic dysphonia, Service, Democratic, John Hopkins Medicine, Cleveland Clinic, Michigan Medicine, University of Michigan, National, University of Pennsylvania Health, Penn Medicine, Neuroscience, CBS Locations: Wall, Silicon