phonation disorders การใช้

• A "'phonation disorder "'is a problem with pitch, loudness, or intensity that originates in the vocal folds of the larynx.
• Phonation disorders may be " functional ", caused by continuous yelling or throat clearing, excessive smoking, or speaking at an abnormally low frequency or pitch.
• Phonation disorders may also be " organic ", due to viral growths, cancer, paralysis of laryngeal nerves, surgical intubation, or external traumas such as being hit in the throat with a baseball.