Interpersonal Trauma and Substance Use Severity: The Serial Mediation of Emotional Intolerance and Emotional Dysregulation.

Substance use is highly prevalent in those with trauma histories, especially in women, which may be in part explained by high rates of interpersonal trauma in this population. Research examining the potential mechanisms underlying the relationship between co-occurring interpersonal trauma histories and substance use disorders (SUDs) is in its infancy. The current study examined whether the relationship between interpersonal trauma and SUD severity could be understood via the sequential ordering of two transdiagnostic emotional vulnerability factors: 1) emotional intolerance (anxiety sensitivity, distress intolerance), and 2) emotional dysregulation (negative urgency, lack of clarity, nonacceptance, limited strategies, difficulties with goal-directed behavior). A sample of 130 adult community-based women self-identifying as experiencing substance use problems completed the online survey. Mediation analyses suggest that as women's lifetime interpersonal trauma increases, so does their SUD severity by way of emotional intolerance and subsequent difficulties regulating their emotions. The findings suggests that transdiagnostic interventions targeting tolerance of aversive emotions may facilitate the ability to learn and employ healthy emotion regulation strategies among women with interpersonal trauma histories and SUDs.