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Voice Disorders. A voice disorder is when the voice has a problem with pitch, volume, tone, and other qualities. These problems occur when the vocal cords don't vibrate normally. Your voice is the sound that air makes when it is forced out of your lungs and passes over your vocal cords.
Dysphonia is the medical term for a speech disturbance (phonation), usually resulting in a hoarse voice or whispering voice, due to problems with the larynx (voice box). Spasmodic dysphonia is a form of dystonia where there is involuntary spasms of the vocal cords.This causes interruptions in speech, or the voice may appear to be strained. The most common cause of dysphonia is laryngitis and this causes a temporary disturbance in phonation (sound production).his causes interruptions in speech, or the voice may appear to be strained. The most common cause of dysphonia is laryngitis and this causes a temporary disturbance in phonation (sound production).