Robert F. Kennedy Jr. started developing symptoms of the condition in 1996. Spasmodic dysphonia is a neurological condition that causes certain muscles in the “voice box,” or larynx, to spasm, often making the voice sound raspy, strained or breathy.

Ever wondered why Robert Kennedy Jr.'s voice sounds unusual? He was diagnosed with a neurological disorder that impacts vocal cords. What to know.

Robert F. Kennedy Jr. has a disorder called spasmodic dysphonia that makes it sound like his voice is shaking. He has said the neurological disease began to affect him when he was 42. “I have a tremble in my

The neurological condition can cause people like Robert F. Kennedy Jr. to have voices that break and can sound “strangled.”

Kennedy Jr., known to the world as RFK Jr. for short, suffers from "spasmodic dysphonia, a specific form of an involuntary movement disorder called dystonia that affects only the voice box," ABC News has reported.

RFK Jr.'s raspy voice is due to spasmodic dysphonia. The neurological disorder produces muscle spasms in the voice box.

Spasmodic dysphonia impacts about 50,000 people in North America. Here's what to know about what causes spasmodic dysphonia and how it's treated.

Robert F. Kennedy, Jr. has struggled for decades with a rare disorder affecting his speech, causing his voice to sound strained and raspy when he speaks.

Robert F. Kennedy Jr. explains why his voice sounds raspy and strained, causing difficulty when he speaks. Here's more about spasmodic dyshphonia