Stress-Induced Pain Modulation Mechanisms

Stress alters pain perception through a dynamic interplay of neural, endocrine and immune pathways. Acute stress often triggers an analgesic response, mediated by endogenous opioids and activation of descending inhibitory circuits that project from the periaqueductal grey and rostroventral medulla to the spinal dorsal horn. Conversely, persistent or excessive stress can provoke hyperalgesia or allodynia by sensitising peripheral nociceptors and enhancing central sensitisation within spinal and supraspinal networks. Glucocorticoid release via the hypothalamic–pituitary–adrenal axis exerts both anti-inflammatory and pronociceptive effects, depending on timing and receptor context. Proinflammatory cytokines and stress-induced release of excitatory neurotransmitters further remodel synaptic connections in limbic and prefrontal regions, reinforcing maladaptive pain memories and emotional distress. Adaptive responses to short-term stress may protect against injury, whereas chronic stress drives neural plasticity that sustains persistent pain and amplifies affective disturbances. Recent advances highlight the role of neuroendocrine–immune cross-talk, epigenetic regulation of stress-responsive genes and bidirectional brain–body signalling as central to understanding and intervening in stress-induced pain modulation.

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Stress-Induced Pain Modulation Mechanisms publication trend

The graph below shows the total number of articles in stress-induced pain modulation mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Hypothalamic–Pituitary–Adrenal (HPA) axis: The endocrine system that governs stress responses via the sequential release of corticotrophin-releasing hormone, adrenocorticotropic hormone and glucocorticoids.

Descending pain modulation: Neural circuits originating in brainstem nuclei that regulate incoming nociceptive signals at the spinal cord level, either inhibiting or facilitating pain transmission.

Stress-induced analgesia: A transient reduction in pain perception triggered by acute stress, often mediated by endogenous opioids and noradrenergic pathways.

Stress-induced hyperalgesia/allodynia: Enhanced pain sensitivity or pain in response to normally non-painful stimuli following prolonged or intense stress, driven by peripheral and central sensitisation.

Kynurenine pathway: The metabolic cascade converting tryptophan into several bioactive metabolites, some of which modulate neuronal excitability and immune signalling in pain states.

Central sensitisation: A heightened responsiveness of central nociceptive neurons due to repeated or sustained peripheral input, leading to amplified pain perception.

References

1. Glucocorticoid Hormones as Modulators of the Kynurenine Pathway in Chronic Pain Conditions. Cells (2023).
2. Preventive Roles of Rice-koji Extracts and Ergothioneine on Anxiety- and Pain-like Responses under Psychophysical Stress Conditions in Male Mice. Nutrients (2023).
3. Effects of stress on pain in females using a mobile health app in the Russia-Ukraine conflict. npj Mental Health Research (2024).