Pathophysiology of pain - non-nociceptive

Definition

Non-nociceptive pain is a broader category encompassing pain not explained by straightforward nociceptor activation from ongoing tissue damage - including neuropathic pain specifically, but also pain with a significant psychological, social, or existential contribution ("total pain")
Recognising a non-nociceptive contribution is common in advanced illness, where physical, psychological, social, and spiritual distress frequently interact and amplify one another rather than existing independently

The "total pain" concept (Cicely Saunders) recognises that a patient's pain experience integrates physical nociception with psychological distress (anxiety, depression, fear), social concerns (financial stress, family relationships, unfinished business), and spiritual/existential distress (meaning, mortality) - each dimension can amplify the perceived intensity of physical pain, independent of the degree of actual tissue pathology

Pain that responds poorly to appropriately titrated analgesia, or that seems disproportionate to the apparent degree of tissue pathology, should prompt assessment of these non-nociceptive contributors rather than simply continuing to escalate analgesic dose
A comprehensive psychological/social/spiritual assessment (see assessment of psychological, cultural and spiritual needs) is the appropriate diagnostic approach here, rather than further analgesic titration or additional physical investigation alone

Addressing the underlying psychological, social, or spiritual distress directly (psychology/counselling input, social work, pastoral/spiritual care) alongside, not instead of, appropriate physical analgesia - treating only the physical component while ignoring a significant non-nociceptive contributor will produce persistently unsatisfactory pain control
Multidisciplinary team involvement is often necessary given the multiple domains potentially contributing

Total pain (Cicely Saunders), psychological/existential distress assessment, treatment-refractory pain requiring multidisciplinary reassessment

Persistently poor pain control despite an adequately titrated, mechanism-appropriate analgesic regimen should prompt reassessment for a significant non-nociceptive (psychological/social/spiritual) contributor, rather than simply continuing to escalate opioid dose with diminishing benefit and increasing side-effect burden

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