Oropharyngeal cancer includes cancers of the tonsils, base of the tongue and other parts of the throat. It’s usually caused by the human papillomavirus (HPV). People who have successfully completed treatment for HPV-related oropharyngeal cancer often have a good prognosis and are able to return to their daily lives.

But survivors may go on to develop voice and speech symptoms years after treatment. Moderate to severe voice symptoms...