Nasal voice
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A nasal voice is a type of speaking voice characterized by speech with a "nasal" quality.[clarification needed] It can also occur naturally because of genetic variation.
Nasal speech can be divided into hypo-nasal and hyper-nasal.
Hyponasal speech, denasalization, or rhinolalia clausa is a lack of appropriate nasal airflow during speech,[1] such as when a person has nasal congestion.
Some causes of hyponasal speech are adenoid hypertrophy, allergic rhinitis, deviated septum, sinusitis, myasthenia gravis, and turbinate hypertrophy.