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Stuttering, also known as stammering, is a speech disorder in which the flow of speech is disrupted by involuntary repetitions and prolongations of sounds, syllables, words or phrases as well as involuntary silent pauses or blocks in which the person who stutters is unable to produce sounds. The exact cause of stuttering is unknown but it is believed to be neurological and possibly genetic. There are a number of different treatment options available for stuttering including speech therapy, medication and surgery.