Diagnostics Beyond Structural Imaging

This study published in 2026 emphasizes what many people suffering from chronic pain already know too well: normal imaging and lab tests do not always mean nothing is wrong. Pain is tied to a structural paradigm. But normal imaging does not imply normal biology. 

Chronic pain is estimated to affect roughly one in three Americans. 

Nociception: The neural process required for pain. 

Nociception is necessary for pain and underlies all painful states. As we now understand it, nociception is not just a process confined to tissue damage or the activation of nerve endings (nociceptors). It spans peripheral nociceptors, dorsal root ganglia, spinal circuits, and supraspinal networks, meaning it is distributed throughout the whole body but remains functionally unified (much like our central nervous system). It works alongside our central nervous system and our immune system: 

Peripheral input drives central processing. 

Central circuits modulate peripheral sensitivity. 

So disruption at one level disrupts the others. 

Nociception operates through molecular, cellular, and network-level mechanisms within peripheral nociceptors, dorsal root ganglia, spinal circuits, and supraspinal networks. However , these mechanisms operate at a scale that conventional diagnostics were never designed to detect. 

How can we reliably diagnose through nociceptive biology?

There are existing tools (some still undergoing trials) that can detect physiologic nociceptive pathology. 

Many research studies can already demonstrate microstructural, neuroimmune, electrophysiological, and metabolic abnormalities in people with chronic pain whose imaging and laboratory results appear normal. Though the authors say much of this research is still discovery-stage. 

These techniques are promising evidence that previously invisible mechanisms can be measured, but that does not yet mean most are validated clinical tests that can reliably diagnose the cause of an individual patient’s pain. Some remain primarily research tools.

Emerging diagnostic processes

CEST MRI

• A more sophisticated type of MRI that looks at the chemistry inside tissues, rather than mainly their shape and structure.

• A spinal disc may look normal on a regular MRI but have chemical changes—such as altered acidity—that suggest it could be generating pain.

AI / radiomics of ordinary MRI

• Software analyzes an MRI pixel-by-pixel for subtle patterns the human eye can’t reliably recognize. It can use the same MRI images patients already receive.

• Tiny changes in the quality or composition of muscles around the spine that may correlate with how much pain someone experiences.

PET imaging of activated microglia

• A special brain/body scan uses a tracer to highlight immune cells that become activated during inflammation in the nervous system.

• Neuroinflammation in the brain or spinal cord that wouldn’t necessarily appear on a conventional MRI or routine blood test.

MEG (magnetoencephalography)

• Measures extremely small magnetic signals produced by brain activity—essentially watching how brain networks communicate in real time.

• In fibromyalgia, abnormal timing or rhythms in pain-related brain circuits even though the brain looks structurally normal.

Advanced blood immune profiling

• Instead of asking whether a few standard inflammation markers are high, researchers measure many immune signals simultaneously and look for patterns.

• Subgroups of people whose immune systems appear unusually activated even though routine bloodwork says everything is normal.

Microneurography

• A very fine electrode is placed next to an individual peripheral nerve so researchers can listen directly to pain-sensing nerve fibers firing.

• Pain fibers firing spontaneously when they shouldn’t be, providing direct evidence of abnormal nerve activity even though there is no visible injury.

CSF cytokine testing

• Researchers examine inflammatory molecules in cerebrospinal fluid, the fluid surrounding the brain and spinal cord, rather than relying only on blood tests.

• Inflammation occurring specifically inside the nervous system that may never show up as elevated inflammation in the bloodstream.

Targeted neurophysiology / ganglion imaging

• Instead of doing another general body scan, clinicians investigate particular nerves, nerve clusters, or pathways suspected of malfunctioning.

• Localized nerve abnormalities that routine systemic testing could miss.

Pain is real when biology is altered—even if imaging is normal. Diagnostics must evolve from the structural paradigm to reflect the true biology of nociception. Pain is not “all in your head” just because your labs or imaging are normal. In fact, it is all throughout your body in ways we are constantly learning to detect. Hopefully diagnostics will catch up to research models soon enough.