What causes mixed nasality in speech?

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functional areas of the human brain — speech disorder Functional areas of the human brain.

Mixed nasality is not a single condition but rather a complex speech disorder that results from the simultaneous presence of both open nasality (hypernasality) and closed nasality (hyponasality).1

This condition occurs when an individual experiences one cause of open nasality—such as palatal paralysis, congenital malformation, or injury—in combination with a separate cause of closed nasality, such as an obstruction of the nasopharynx caused by [adenoids]. These underlying factors can be a mix of organic and functional origins.1

The resulting speech pattern is characterized by nasal sounds that appear muffled or subdued, while oral sounds simultaneously exhibit signs of open nasality. Because treating only one component can exacerbate the other, it is essential that a tonsil and adenoid evaluation be conducted by a specialist, such as an otolaryngologist or phoniatrist, to carefully balance the patient's overall health and speech needs.1