What causes hyponasal speech?

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

Hyponasal speech, also known as closed nasality, is characterized by decreased nasal resonance, which muffles the nasal sounds M, N, and Ng. The causes of this condition are categorized as follows:1

Organic Causes

These are the most common factors and typically involve obstructions of the nasal airway, including:
* Acute colds and hay fever.1
* Large adenoids.1
* Other nasal diseases that obstruct the airway.1

Functional Causes

These are less frequent and include:
* Rare, faulty speech habits.1
* Intellectual disability.1
* Severe language disability.1

In some cases, individuals may experience mixed nasality, which occurs when a cause of closed nasality (such as adenoid obstruction) is combined with a cause of open nasality (such as palatal paralysis or congenital deficiency). Because treatment requires balancing these complex factors, a thorough evaluation by a specialist is essential before considering any surgical intervention, such as the removal of tonsils or adenoids.1