What causes spasmodic dysphonia?
Symptoms come from more than one source. Some people appear to have nervous system changes that produce an organic tremor of the vocal cords. Others may have dystonia, another kind of neurologic disorder that creates abnormal muscle tone. In rare cases, people can have spasmodic dysphonia symptoms because of acute or chronic life stress.
When not used for talking, the vocal cords of people with spasmodic dysphonia are normal in appearance and function. However, when the vocal cords are brought together for talking, their movement is uncontrolled.
How common is spasmodic dysphonia?
ASHA has prepared a report, Incidence and Prevalence of Speech, Voice, and Language Disorders in Adults in the United States that includes information about how many people experience voice disorders.
See also:
Spasmodic Dysphonia
Spasmodic Dysphonia: Benefits of Speech-Language Pathology Services
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