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There are two main types of stammering: developmental or acquired stammering.
The former, developmental stammering, is the most common, which happens in early childhood when speech and language skills are developing quickly.
An acquired stammer is when a stammer occurs in older children or adulthood as a result of a head injury, stroke, or a progressive neurological condition.
“It can also be caused by certain drugs, medicines, or psychological or emotional trauma,” the NHS adds.
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