Definition

Spasmodic dysphonia is a voice disorder caused by the excessive tension in the laryngeal muscles. Individuals with spasmodic dysphonia have breaking voices and face difficulty to start and continue communication.

The number of people suffering spasmodic dysphonia of unknown origin in U.S. ranges from 50,000 to 100,000 based on the U.S .statistics. Korea has no accurate statistical data on spasmodic dysphonia, but the number is assumed to be from 5,000 to 10,000.

Spasmodic dysphonia is often classified according to the age the symptoms develop. When symptoms develop before the age of 20, it is called infant type. When symptoms develop after the age of 20, it is called adult type.

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