Functional voice disorder is the commonest cause of dysphonia as it leads to the development of vocal fold nodules. They develop because of voice misuse, overuse and/or abuse. An otorhinolaryngologist (a phoniatrician – if possible), a clinical speech and language therapist, and a clinical psychologist should be involved in the diagnostics of vocal fold nodules. All three professionals also cooperate during their treatment, but the speech and language thera­pist has the principal role. Surgical treatment is taken into consideration only when voice therapy has been unsuccessful. Preventive programs that are included in educational cur­riculums for occupations involving voice strain may decrease the incidence of voice prob­lems among voice professionals.