A voice disorder is the difference in quality, pitch, or loudness from others of the same age, sex, cultural background, and geographic location. Different types of voice disorders include:
- Vocal Fold Nodules and Polyps
- Vocal Fold Paralysis
- Paradoxical Vocal Fold Movement
- Spasmodic Dysphonia
Source:http://www.asha.org/public/speech/disorders/voice.htm