What is collective trauma?

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Collective trauma is trauma experienced by a group of people — a community, culture, ethnic group, or nation — through shared events of violence, oppression, displacement, or catastrophe, the effects of which persist across generations through biological inheritance, cultural transmission, family systems, and the ongoing presence of the conditions that caused the original harm. Dr. Resmaa Menakem, licensed therapist and author of My Grandmother's Hands, argues that collective trauma — particularly the trauma of slavery, genocide, and colonization — is stored in the bodies of entire peoples and transmitted through generations as nervous system patterns, hypervigilance, chronic stress activation, and relational dysregulation. The Adverse Childhood Experiences (ACEs) research, originally conducted by Dr. Vincent Felitti and Dr. Robert Anda through the CDC and Kaiser Permanente, demonstrated that chronic stress — including poverty, discrimination, and systemic violence — produces the same physiological and psychological effects as individual trauma, and that these effects are cumulative. Dr. Arline Geronimus at the University of Michigan introduced the concept of "weathering" to describe how sustained exposure to systemic racism produces early biological aging and health deterioration in Black Americans — demonstrating that collective and systemic stress has measurable bodily consequences. Healing collective trauma requires both individual work — addressing how systemic conditions have shaped one's own nervous system and relational patterns — and collective action that addresses the systemic conditions themselves. Neither alone is sufficient.