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Causes of Spasmodic Dysphonia
What Causes Spasmodic Dysphonia?
The exact cause of spasmodic dysphonia is not known. Most cases are believed to be caused by a nervous system disorder, and may occur with other movement disorders.
Spasmodic dysphonia may be a genetic disorder, or may begin following an upper respiratory infection, injury to the larynx, a long period of voice use, or stress.