Why Social Stress Is the Most Biologically Damaging Form of Stress

The TSST, the Trier Social Stress Test, reliably induces a cortisol response in laboratory conditions by asking participants to give a speech in front of an evaluative audience and complete mental arithmetic under observation. It is one of the most robust laboratory stress paradigms precisely because social evaluation stress produces some of the largest and most reliable HPA axis responses of any psychological stressor. The reason, from an evolutionary perspective, is that being rejected or excluded from a social group was historically a survival threat. The body still treats it that way.

The Unique Inflammatory Signature of Social Stress

George Slavich at UCLA has documented that social threat stressors, including rejection, exclusion, and social evaluation, produce a specific pattern of pro-inflammatory gene expression, characterised by upregulation of NF-kappaB target genes, that is larger and more persistent than that produced by non-social stressors of comparable subjective intensity. The inflammatory response to social stress appears to be mediated in part by the same neural circuits that process physical pain, with overlapping activity in the anterior cingulate cortex.

Practical Implications

For adults managing chronic stress, identifying whether a significant component is socially-driven, whether from difficult relationships, workplace dynamics, perceived social comparison, or loneliness, is clinically relevant. Social stress that is ongoing and unresolved is disproportionately biologically damaging compared to environmental, financial, or workload stressors. Interventions that specifically address the social component of chronic stress, including social skills development, relationship quality improvement, and community connection, have a biological rationale that goes beyond the psychological.

Sources

• Slavich, G.M., & Irwin, M.R. (2014). From stress to inflammation and major depressive disorder: a social signal transduction theory of depression. Psychological Bulletin, 140(3), 774-815.
• Kemeny, M.E. (2009). Psychobiological responses to social threat: evolution of a psychological model in psychoneuroimmunology. Brain, Behavior, and Immunity, 23(1), 1-9.
• Eisenberger, N.I., et al. (2007). An experimental study of shared sensitivity to physical pain and social rejection. Pain, 126(1-3), 132-138.