Two kinds of voice disorders
Organic - involves structural deviation of the laryngeal mechanism which will in turn affect how the vocal folds vibrate. Primary treatment: medical, dental, surgical that may be followed by speech therapy. It involves respiration, phonation, resonation, and articulation.
Functional - no weakness, paralysis or other neurological disease of the vocal folds and no nodules, cysts, polyps. Treated with counseling or psychotherapy.