Book excerpt: Emotion in Posttraumatic Stress Disorder provides an up-to-date review of the empirical research on the relevance of emotions, such as fear, anxiety, shame, guilt, and disgust to posttraumatic stress disorder (PTSD). It also covers emerging research on the psychophysiology and neurobiological underpinnings of emotion in PTSD, as well as the role of emotion in the behavioral, cognitive, and affective difficulties experienced by individuals with PTSD. It concludes with a review of evidence-based treatment approaches for PTSD and their ability to mitigate emotion dysfunction in PTSD, including prolonged exposure, cognitive processing therapy, and acceptance-based behavioral therapy. - Identifies how emotions are central to understanding PTSD. - Explore the neurobiology of emotion in PTSD. - Discusses emotion-related difficulties in relation to PTSD, such as impulsivity and emotion dysregulation. - Provides a review of evidence-based PTSD treatments that focus on emotion.