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Speech disorders are a type of communication disorders where 'normal' speech
is disrupted. This can mean stuttering, lisps, stammering, vocal dysphonia
etc. Many of these types of disorders can be treated by speech therapy, but
others require medical attention by a doctor in phoniatrics.
Classifying speech into normal and disodered is more problematic than it
first seems. By a strict classification, only 5% to 10% of the population
have a completely normal (with respect to all parameters) and healthy voice,
all others suffer from one disorder or another. Dysphonia, that is,
incomplete functionality of the vocal folds, is one of the most common and
can be observed as, for example, an unusual roughness of the voice.
Stuttering is also quite common, about 7% of the population suffer from it
at some point in life.