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aphonia
Aphonia is the inability to produce voice. It is considered more severe than dysphonia. A primary cause of aphonia is bilateral disruption of the recurrent laryngeal nerve, which supplies nearly all the muscles in the larynx. Damage to the nerve may be the result of surgery (e.g., thyroidectomy) or a tumor.
Aphonia means "no sound." In other words, a person with this disorder has lost his/her voice.
==Psychogenic aphonia==
Psychogenic aphonia is often seen in patients with underlying psychological problems. Laryngeal examination will show usually bowed vocal folds that fail to adduct to the midline during phonation. However, the vocal folds will adduct when the patient is asked to cough. Treatment should involve consultation and counseling with a speech pathologist and, if necessary, a psychologist.
In this case, the patient's history and the observed unilateral immobility rules out functional aphonia.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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