Etiology

Although the etiology of stuttering is not fully understood, there is strong evidence to suggest that it emerges from a combination of constitutional and environmental factors. Geneticists have found indications that a susceptibility to stuttering may be inherited and that it is most likely to occur in boys.1,2,3 Further support for inheritance comes from twin studies that have demonstrated a higher concordance for stuttering among both members of identical twin pairs than fraternal twin pairs.4,5 Congenital brain damage is also suspected to be a predisposing factor in some cases.1 For a large number of children who stutter, however, there is neither family history of the disorder nor clear evidence of brain damage.

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