E2 ModerateModerate confidencePEM not requiredCross-SectionalPeer-reviewedMachine draft
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Altered Pain Perception and Modulation in Individuals With Post-COVID-Condition: Insights From Quantitative Sensory Testing.
Lange, Hannah, Reichert, Julian, Vock, Stephanie et al. · European journal of pain (London, England) · 2026 · DOI
Quick Summary
This study tested how people with long COVID perceive and respond to pain compared to healthy people. Researchers applied pressure to participants' legs and measured when they first felt pain and when pain became unbearable. People with long COVID felt pain at lower pressure levels and their pain got worse more quickly than healthy controls, suggesting their nervous systems process pain differently.
Why It Matters
This study provides objective psychophysical evidence that long COVID involves altered central pain processing (nociplastic pain), which may explain why many patients experience widespread or disproportionate pain. Understanding these mechanisms is crucial for developing targeted pain management therapies for the post-COVID population and validates that pain abnormalities in long COVID have measurable neurobiological underpinnings.
Observed Findings
Individuals with PCC had significantly lower pain detection thresholds (PDT) and pain tolerance thresholds (PTT) compared to healthy controls.
Temporal summation of pain (pain amplification over repeated stimuli) was increased in PCC participants.
Spatial summation of pain at the tolerance threshold was decreased in PCC compared to controls.
A higher proportion of healthy controls showed inhibitory conditioned pain modulation (pain suppression by competing stimuli) compared to PCC participants.
Pain perception abnormalities were more pronounced in PCC participants with comorbid chronic pain and severe symptomatology.
Inferred Conclusions
Individuals with post-COVID condition demonstrate evidence of central sensitization—a heightened and dysregulated pain processing state in the nervous system.
The altered pain perception pattern suggests nociplastic pain (pain caused by altered nociceptive processing) rather than nociceptive or neuropathic pain alone.
Chronically painful long COVID may benefit from targeted interventions addressing central pain amplification mechanisms.
Further research into pain modulation therapies is warranted for this patient population.
Remaining Questions
What This Study Does Not Prove
This cross-sectional design cannot establish causation or whether altered pain perception precedes long COVID or develops as a consequence of the illness. The study does not identify the specific mechanisms driving central sensitization or whether these pain processing changes are reversible with treatment. Additionally, findings in a post-COVID population may not fully generalize to ME/CFS patients, though overlap in chronic pain symptoms suggests relevance.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →