Voice therapy has been demonstrated to be effective for dysphonia across the lifespan from children to older adults. Voice therapy is the first line of treatment for vocal fold lesions like vocal nodules, polyps, or cysts. These lesions often occur in people with vocally intense occupations like teachers, attorneys, or clergy. Another possible cause of these lesions is vocal overdoing often seen in sports enthusiasts; in socially active, aggressive, or loud children; or in high energy adults who often speak loudly. Voice therapy, specifically the Lee Silverman Voice Therapy method, has been demonstrated to be the most effective method of treating the lower volume, lower energy, and rapid-rate voice/speech of individuals with Parkinson’s disease.

Voice therapy has been used to treat dysphonia concurrently with other medical therapies like botulinum toxin injections for spasmodic dysphonia and/or tremor.