Understanding Spasmodic Dysphonia – Dysphonia International

January 27, 2025

Spasmodic dysphonia is a task-specific, focal dystonia, meaning that the muscles spasm only when they are used for particular actions and not when they are at rest. When a person with SD attempts to speak, involuntary spasms in the tiny muscles of the larynx cause the voice to break up, or sound strained, tight, strangled, breathy, or whispery.

https://dysphonia.org/voice-conditions/spasmodic-dysphonia/

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