Why Pain Needs a Systems Framework

Pain is not just pain. The classical nociceptive model: tissue damage, receptor activation, perceived signal: fails to capture the full complexity of how pain arises and persists. Peripheral sensitization, central sensitization through synaptic remodelling, and neuroimmune crosstalk collectively produce phenotypes that no longer map onto tissue injury alone: pain at rest, pain without structural correlate, pain that is mechanistically a different entity. These processes operate across multiple scales simultaneously, and their interactions are not captured by studying any single pathway in isolation. No existing resource represents these cross-scale mechanisms in a computable, disease-contextualizable format. The APM was built to close that gap.

What APM Contains

The APM is organized into five mechanistic modules: tissue and inflammatory inputs, peripheral sensitization, neuroimmune amplification, central sensitization, and descending modulation. All interactions are manually curated, annotated with primary literature references, and bridge-linked to the Atlas of Inflammation.

Clinical pain scoring tools are integrated as interactive entry points within the platform. Selecting a score highlights the associated pain phenotype profile, brings the most relevant modules to the foreground, and suggests mechanistically matched submaps for further exploration, connecting clinical assessment directly to the underlying molecular landscape.

Built to Scale

The APM is designed to grow, through completion of all five modules, extension to further disease contexts, and integration of multi-omics data with clinical phenotype layers, toward a resource that connects a patient's pain profile not just to a score, but to the biology driving it.