A voice disorder is usually caused by misuse of the voice or even a neurological disorder such as Parkinson's disease Speech therapy can help Parkinson's patients with problems such as soft or hoarse voice, mumbled or monotone speech, and swallowing difficulties that start early in the disease process and progressively diminish quality of life Any condition that affects the performance of the voice-producing organ, the larynx, can cause a voice disorder. Voice disorders or pathologies occur in approximately 7.5 million individuals. William serves patients experiencing voice problems as a result of phonotraumatic behaviors, gastro-espohageal reflux/laryngeal pharyngeal reflux, and vocal fold pathologies (e.g., nodules, cysts, polyps, gramulomas).