Can ongoing nociceptive input from chronic musculoskeletal pain reinforce central sensitization?

Chronic musculoskeletal pain may involve both ongoing peripheral nociceptive signaling and amplified central processing. The strongest part of the claim is that central sensitization increases responsiveness within spinal and brain pain pathways; the proposed reinforcing role of persistent nociception is biologically credible but less directly demonstrated in prospective human studies.

Clinical and mechanistic evidence

• Central sensitization is increased responsiveness of central nociceptive neurons to normal or subthreshold input. It can contribute to hyperalgesia (exaggerated pain from painful stimuli) and allodynia (pain from normally non-painful stimuli).
• In chronic low-back pain, lower pressure-pain thresholds at sites remote from the painful region and enhanced temporal summation versus healthy controls are consistent with augmented central nociceptive processing.
• Alterations reported in pain-related brain regions and networks also fit experience-dependent plasticity across shared spinal and supraspinal pathways. These observations support a system-level mechanism rather than pain being determined solely by local tissue pathology.

Persistent nociception and amplification

• Ongoing input associated with inflammation, tissue injury, or nerve damage can plausibly sustain peripheral and spinal sensitization, helping reinforce heightened central responsiveness.
• This process likely interacts with altered descending inhibition, neuroimmune signaling, and plasticity in ascending and descending pain pathways. Thus, persistent pain can reflect a feedback-prone system in which peripheral input and central amplification coexist.

Interpretation for practice

• Quantitative sensory measures, including pressure-pain thresholds, temporal summation, and conditioned pain modulation, are indirect and heterogeneous; conditioned pain-modulation results in low-back pain are mixed.
• Group-level sensory or neuroimaging findings do not establish a specific causal abnormality, diagnostic biomarker, or dominant pain driver in an individual, including an older adult with chronic musculoskeletal pain.

Bottom line

• Central sensitization is well supported as a contributor to heightened spinal and brain pain-pathway responsiveness; persistent nociceptive input is a plausible, moderately supported factor that may reinforce it, rather than a proven sole cause.