In this introduction to the Special Issue on Trauma and Idioms of Distress, we provide an overview of the concept and typology of idioms of distress, focusing particularly on their clinical utility. This includes the role of idioms as indicators of trauma exposure, of various types of psychopathology and of levels of distress, risk and functioning. It likewise includes the fact that idioms of distress may profoundly influence the personal meaning of having a trauma-related disorder, may shape the interpersonal course of the disorder and may pattern help-seeking and self-treatment.