{"id":8054,"date":"2026-07-17T16:57:44","date_gmt":"2026-07-17T14:57:44","guid":{"rendered":"https:\/\/blueportance.com\/knowledge-base\/expert-guides\/understanding-pain\/nervous-system-hypersensitization\/"},"modified":"2026-10-25T22:43:26","modified_gmt":"2026-10-25T21:43:26","slug":"nervous-system-hypersensitization","status":"publish","type":"page","link":"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/understanding-pain\/nervous-system-hypersensitization\/","title":{"rendered":"KB 3_Expert Guide_01_Understanding Pain_07_Nervous System Hypersensitization"},"content":{"rendered":"\n\n<style>\n    body{font-family:Arial,sans-serif;line-height:1.65;padding:20px;color:#333}\n    .bp-q-breadcrumb{font-size:.85rem;color:#6b7280;margin:0 0 20px}\n    .bp-q-breadcrumb a{color:#2a7fba;text-decoration:none}\n    h1{color:#0e2a47;font-size:1.8rem;line-height:1.25;margin:0 0 22px}\n    h2{color:#1a4d72;margin-top:42px;line-height:1.3}\n    h3{color:#0e2a47;margin-top:28px}\n   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.bp-bdc-dossier-subtitle{color:#3a6d8a;font-size:.94rem;font-style:italic;line-height:1.6;margin:10px 0 20px}\n    .bp-bdc-dossier-link{margin:0 0 26px;font-size:.9rem;color:#3a6d8a}\n    .bp-bdc-dossier-link a{color:#2a7fba;font-weight:600;text-decoration:none}\n    .bp-bdc-epistemic{margin:0 0 24px;padding:15px 18px;border-left:4px solid #d39b22;border-radius:6px;background:#fff8e1;color:#5a4a00;font-size:.9rem}\n    .bp-inline-ref{white-space:nowrap;font-size:.88em;color:#5f6f7d}\n    @media(max-width:640px){body{padding:16px}h1{font-size:1.5rem}table{display:block;overflow-x:auto}}\n    .bp-bdc-toc{background:#f8fbff;border:1px solid #dbeaf7;border-radius:9px;padding:18px 22px;margin:24px 0 32px}\n    .bp-bdc-toc h2{margin:0 0 10px;font-size:1rem;color:#1a4d72}\n    .bp-bdc-toc ul{margin:0;padding-left:20px;list-style:none}\n    .bp-bdc-toc li{margin-bottom:6px;font-size:.92rem}\n    .bp-bdc-toc a{color:#2a7fba;text-decoration:none}\n    .bp-bdc-toc a:hover{text-decoration:underline}\n  <\/style>\n<style>\n.bp-bdc-breadcrumb{max-width:900px;margin:0 auto;padding:20px 16px 0;font-size:.85rem;color:#6b7280;}\n.bp-bdc-breadcrumb a{color:#2a7fba;text-decoration:none;}\n.bp-bdc-breadcrumb a:hover{text-decoration:underline;}\n<\/style>\n\n<nav class=\"bp-bdc-breadcrumb\" aria-label=\"Breadcrumb\">\n<a href=\"\/en\/\">Blue Portance<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/\">Knowledge Base<\/a> \u2192 <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/understanding-pain\/\">Understanding Pain<\/a> \u2192 Nervous System Hypersensitization\n<\/nav>\n\n<div class=\"bp-bdc-header-card\">\n  <div class=\"bp-bdc-kicker\">Blue Portance Expert Guides<\/div>\n  <div class=\"bp-bdc-rule\"><\/div>\n  <div class=\"bp-bdc-dossier-title\">Understanding Pain<\/div>\n  <div class=\"bp-bdc-dossier-subtitle\">The biological, mechanical, and neurophysiological mechanisms of pain.<\/div>\n<\/div>\n\n<p class=\"bp-bdc-dossier-link\">\n  This article is part of the Expert Guide\n  <a href=\"https:\/\/blueportance.com\/en\/knowledge-base\/expert-guides\/understanding-pain\/\">\u201cUnderstanding Pain\u201d<\/a>.\n<\/p>\n\n<span class=\"bp-pillar-badge\">Reference article \u2014 Blue Portance Knowledge Base<\/span>\n\n<h1>Why Does Pain Persist When Everything Looks Normal? Nervous System Hypersensitization<\/h1>\n\n<div class=\"bp-bdc-epistemic\">\n  <strong>Epistemic note<\/strong> \u2014 This article distinguishes between central sensitization as described in the scientific literature, the role of fascia as a sensory organ, and the biomechanical interpretation proposed by Blue Portance. Central sensitization is an established biological mechanism; by contrast, the way everyday mechanical stresses sustain it in a given person is a working hypothesis, not a diagnosis. This content does not replace a medical evaluation.\n<\/div>\n\n<section class=\"bp-summary\">\n  <p>\n    <strong>Summary<\/strong> \u2014 Chronic pain does not always signal active damage. It may instead reflect a nervous system that has become hypersensitive: it lowers its triggering threshold, amplifies signals, and spreads them beyond the initial area. This phenomenon, known as central sensitization, is a documented biological phenomenon and is potentially reversible. It does not, however, occur in a vacuum: fascia, which is richly innervated, continuously transmits mechanical information to the nervous system. When this information remains poor and repetitive, it may help sustain the hypersensitivity. Restoring mechanical variability is then one of the available levers, without being able, on its own, to address every situation.\n  <\/p>\n<\/section>\n\n<div class=\"bp-figure\">\n  <img decoding=\"async\" src=\"https:\/\/blueportance.com\/wp-content\/uploads\/VII.1.How-protective-pain-gradually-becomes-chronic-pain.png\" alt=\"Progressive transition from protective pain to persistent chronic pain through nervous system adaptation.\" loading=\"lazy\">\n<\/div>\n<p class=\"bp-figure-caption\">\n  <strong>Figure 1 \u2014 How protective pain gradually becomes chronic pain.<\/strong> The transition to chronic pain is not a sudden event but a gradual process of nervous system adaptation. A protective response that is initially useful can become excessive, then persistent, when painful stimulation continues over time.\n<\/p>\n\n<nav class=\"bp-bdc-toc\" aria-label=\"Table of contents\">\n  <h2>Table of Contents<\/h2>\n  <ul>\n      <li><a href=\"#1-une-douleur-sans-lesion-visible-n-est-pas-une-douleur-imaginaire\">1. Pain without visible damage is not imaginary pain<\/a><\/li>\n      <li><a href=\"#2-qu-appelle-t-on-sensibilisation-centrale\">2. What is central sensitization?<\/a><\/li>\n      <li><a href=\"#3-comment-ce-mecanisme-s-installe-t-il\">3. How does this mechanism become established?<\/a><\/li>\n      <li><a href=\"#4-le-role-des-fascias-dans-la-transmission-des-signaux-mecaniques\">4. The role of fascia in transmitting mechanical signals<\/a><\/li>\n      <li><a href=\"#lecture-proposee-par-le-modele-blue-portance\">The interpretation proposed by the Blue Portance model<\/a><\/li>\n      <li><a href=\"#5-la-peur-du-mouvement-peut-entretenir-la-boucle\">5. Fear of movement can sustain the loop<\/a><\/li>\n      <li><a href=\"#6-pourquoi-reintroduire-de-la-variabilite-mecanique\">6. Why reintroduce mechanical variability?<\/a><\/li>\n      <li><a href=\"#7-limites-et-controverses\">7. Limitations and controversies<\/a><\/li>\n      <li><a href=\"#8-consequences-pratiques-pour-comprendre-une-situation\">8. Practical implications for understanding a situation<\/a><\/li>\n      <li><a href=\"#a-retenir\">Key takeaways<\/a><\/li>\n      <li><a href=\"#questions-frequentes\">Frequently asked questions<\/a><\/li>\n      <li><a href=\"#vous-cherchez-a-comprendre-ce-qui-entretient-vos-douleurs-en-position-assise\">Trying to understand what keeps your sitting-related pain going?<\/a><\/li>\n      <li><a href=\"#references-scientifiques\">Scientific references<\/a><\/li>\n  <\/ul>\n<\/nav>\n\n<h2 id=\"1-une-douleur-sans-lesion-visible-n-est-pas-une-douleur-imaginaire\">1. Pain without visible damage is not imaginary pain<\/h2>\n\n<p>\n  The previous articles in this guide showed that pain can arise from established nerve damage or from a nociplastic mechanism involving altered nociception without damage sufficient to explain it <span class=\"bp-inline-ref\">(Kosek et&nbsp;al., 2016)<\/span>. A third level of interpretation concerns, more specifically, the way the nervous system itself processes and amplifies pain-related information.\n<\/p>\n\n<p>\n  A person can therefore experience intense pain even though imaging shows no structural abnormality. This does not mean the pain is \u201call in the head.\u201d Imaging detects structural lesions, not the functional state of the pain-processing system. Moreover, many abnormalities visible on MRI are found in people who are not in pain, while some very real pain is not accompanied by any identifiable abnormality.\n<\/p>\n\n<div class=\"bp-recognize\">\n  <h3>What this means in practice<\/h3>\n  <ul>\n    <li>pain can be biologically real without active tissue damage;<\/li>\n    <li>it can be measured with research methods (functional imaging, quantitative sensory testing), even though these tools are not used in routine clinical practice;<\/li>\n    <li>it is not proof of psychological fragility;<\/li>\n    <li>it is, at least partially, modifiable.<\/li>\n  <\/ul>\n<\/div>\n\n<p>\n  A point of terminology should also be clarified: hypersensitization is not a fourth pain mechanism to be added to nociceptive, neuropathic, and nociplastic pain. On the contrary, it can accompany each of these three mechanisms, as an acquired property of the nervous system.\n<\/p>\n\n<div class=\"bp-figure\">\n  <img decoding=\"async\" src=\"https:\/\/blueportance.com\/wp-content\/uploads\/VII.3.Hypersensitization-is-not-a-fourth-mechanism.png\" alt=\"Diagram showing hypersensitization as a possible feature of nociceptive, neuropathic and nociplastic pain.\" loading=\"lazy\">\n<\/div>\n<p class=\"bp-figure-caption\">\n  <strong>Figure 2 \u2014 Hypersensitization is not a fourth mechanism.<\/strong> It is a possible development of nociceptive, neuropathic, or nociplastic pain. It is an acquired property of the nervous system, not a new category of pain \u2014 two people with the same cause may evolve differently depending on their degree of hypersensitization.\n<\/p>\n\n<p>\n  What remains is to understand precisely what this amplification mechanism involves.\n<\/p>\n\n<h2 id=\"2-qu-appelle-t-on-sensibilisation-centrale\">2. What is central sensitization?<\/h2>\n\n<div class=\"bp-definition\">\n  <strong class=\"bp-def-source\">Reference definition<\/strong>\n  <p>\n    Central sensitization refers to a prolonged but reversible increase in the excitability and synaptic efficacy of neurons in central nociceptive pathways, following repeated or intense nociceptive activity <span class=\"bp-inline-ref\">(Woolf, 2011)<\/span>.\n  <\/p>\n<\/div>\n\n<p>\n  In concrete terms, this mechanism shows up in three main ways. First, allodynia: a normally non-painful contact, such as clothing rubbing against the skin, becomes painful. Second, hyperalgesia: a mildly painful stimulus triggers a disproportionate response. Finally, spreading: the pain extends beyond the area initially affected <span class=\"bp-inline-ref\">(Woolf, 2011; Latremoliere &amp; Woolf, 2009)<\/span>.\n<\/p>\n\n<p>\n  These changes result from enhanced synaptic efficacy and reduced inhibitory mechanisms in the spinal cord and in the brain structures involved in pain processing. They can also be demonstrated experimentally with sensory testing and imaging techniques <span class=\"bp-inline-ref\">(Woolf, 2011)<\/span>.\n<\/p>\n\n<div class=\"bp-figure\">\n  <img decoding=\"async\" src=\"https:\/\/blueportance.com\/wp-content\/uploads\/VII.2.Why-does-the-nervous-system-react-more-and-more-quickly.png\" alt=\"Comparison of normal and hypersensitive nervous systems showing a lowered pain-trigger threshold.\" loading=\"lazy\">\n<\/div>\n<p class=\"bp-figure-caption\">\n  <strong>Figure 3 \u2014 Why does the nervous system react faster and faster?<\/strong> Over time, the pain-triggering threshold can drop. Stimuli that were previously well tolerated gradually become painful, and responses are amplified.\n<\/p>\n\n<p>\n  This definition remains abstract, however, until we understand how a normal nervous system comes to settle into this state.\n<\/p>\n\n<h2 id=\"3-comment-ce-mecanisme-s-installe-t-il\">3. How does this mechanism become established?<\/h2>\n\n<h3>A system that learns to respond more strongly<\/h3>\n\n<p>\n  The central nervous system displays synaptic plasticity that is comparable, at the molecular level, to the plasticity underlying certain memory processes. Signaling pathways shared by central sensitization and long-term potentiation have been identified, which partly explains why repeated pain can leave a lasting trace in the nervous system <span class=\"bp-inline-ref\">(Ji et&nbsp;al., 2003; Latremoliere &amp; Woolf, 2009)<\/span>.\n<\/p>\n\n<h3>The role of the limbic system<\/h3>\n\n<p>\n  Corticolimbic circuits, particularly those linking the medial prefrontal cortex, the amygdala, and the nucleus accumbens, also contribute to the persistence of pain. Longitudinal studies have shown that the anatomical characteristics of these circuits, measured early after an episode of low back pain, are associated with the later risk of transition to chronic pain <span class=\"bp-inline-ref\">(Vachon-Presseau et&nbsp;al., 2016)<\/span>. A genuine emotional component is therefore added to the sensory component, without the pain ceasing to be biological.\n<\/p>\n\n<h3>Possible, but not systematic, cortical reorganization<\/h3>\n\n<p>\n  In addition, in amputees with phantom limb pain, reorganization of the cortical representation of the missing limb has been associated with the intensity of the pain experienced <span class=\"bp-inline-ref\">(Flor et&nbsp;al., 1995)<\/span>. This work, carried out in the very specific context of deafferentation, illustrates the capacity of the somatosensory cortex to remodel itself; it does not, however, support the claim that identical reorganization applies to all chronic pain.\n<\/p>\n\n<p>\n  Once established, these central mechanisms do not operate in isolation. They are part of a continuous flow of information coming from peripheral tissues, particularly fascia.\n<\/p>\n\n<h2 id=\"4-le-role-des-fascias-dans-la-transmission-des-signaux-mecaniques\">4. The role of fascia in transmitting mechanical signals<\/h2>\n\n<p>\n  Fascia, the connective tissue that envelops muscles, bones, and organs, is richly innervated. According to some authors, it constitutes a genuine sensory organ capable of continuously transmitting information about tissue tension, pressure, and deformation <span class=\"bp-inline-ref\">(Schleip et&nbsp;al., 2012)<\/span>. One hypothesis proposed in the literature is that this connective network may function as a body-wide signaling system, although this hypothesis remains, at this stage, less firmly established than the mechanisms of central sensitization themselves <span class=\"bp-inline-ref\">(Langevin, 2006)<\/span>.\n<\/p>\n\n<p>\n  When the stresses applied to fascia remain continuous, localized, and poorly varied, for example during prolonged static posture, gliding between tissue layers may decrease. The sensory receptors in the area concerned are then stimulated repetitively rather than in varied ways. It is not necessarily the signal itself that is the problem, but its repetition and the little information it carries for the nervous system.\n<\/p>\n\n<p>\n  Taken in isolation, this observation describes a peripheral phenomenon. Combined with an already sensitized nervous system, however, it can feed a self-sustaining loop \u2014 one that, moreover, is not limited to the mechanical dimension alone.\n<\/p>\n\n<div class=\"bp-model\">\n  <h2 id=\"lecture-proposee-par-le-modele-blue-portance\">The interpretation proposed by the Blue Portance model<\/h2>\n  <p>\n    Central sensitization, fascial signaling, and the role of avoidance behaviors are documented separately in the literature. The integrative Blue Portance model proposes connecting them around a simple principle: hypersensitization does not result from a single cause, but from the interaction of several mutually reinforcing factors. This interpretation helps organize reasoning; it is not, as such, the subject of an established scientific consensus.\n  <\/p>\n  <ol>\n    <li><strong>Mechanical stresses:<\/strong> localized and prolonged pressure, lack of micro-movements and variability, repetitive or sustained postures, loss of tissue gliding.<\/li>\n    <li><strong>Pain history:<\/strong> recurring or poorly resolved pain, previous pain experiences, negative anticipation, reinforcement of pain circuits.<\/li>\n    <li><strong>Behaviors, emotions, and cognitions:<\/strong> chronic stress, anxiety, fears and catastrophizing, movement avoidance and deconditioning.<\/li>\n    <li><strong>Lack of variability and recovery:<\/strong> activities with little variety or that are repetitive, insufficient sleep and recovery, imbalance between protection and recovery.<\/li>\n  <\/ol>\n  <p>\n    These four factors interact and reinforce one another, forming a cycle that can become self-sustaining. Their consequences overlap with the manifestations described above: lowered threshold, amplification, spreading beyond the initial area, persistence, and progressive entrenchment if nothing restores the balance. In this interpretation, amplified pain nevertheless remains distinct from pain that has become spontaneous and autonomous, independent of any trigger, which is covered in another article in this guide. This interpretation thus helps guide the analysis; it does not replace a medical evaluation.\n  <\/p>\n<\/div>\n\n<div class=\"bp-figure\">\n  <img decoding=\"async\" src=\"https:\/\/blueportance.com\/wp-content\/uploads\/VII.4.Why-does-this-hypersensitivity-persist.png\" alt=\"Integrative Blue Portance model of factors that may sustain nervous system hypersensitivity.\" loading=\"lazy\">\n<\/div>\n<p class=\"bp-figure-caption\">\n  <strong>Figure 4 \u2014 Why does this hypersensitivity persist?<\/strong> Hypersensitization rarely results from a single cause, but from the interaction between mechanical stresses, painful experiences, emotions, behaviors, insufficient recovery, and lack of variability.\n<\/p>\n\n<p>\n  Understanding this loop raises a practical question: can fear of movement, fueled by the pain itself, become one of its drivers?\n<\/p>\n\n<h2 id=\"5-la-peur-du-mouvement-peut-entretenir-la-boucle\">5. Fear of movement can sustain the loop<\/h2>\n\n<p>\n  The <em>fear-avoidance<\/em> model describes how a catastrophic interpretation of pain can lead a person to avoid it rather than gradually confront it. This avoidance, in turn, promotes deconditioning, stiffness, and reduced exposure to varied movement <span class=\"bp-inline-ref\">(Vlaeyen &amp; Linton, 2000)<\/span>.\n<\/p>\n\n<p>\n  Education about pain mechanisms can change this trajectory. A controlled trial showed that a single educational session, with no accompanying physical exercise, could already change certain beliefs and certain aspects of physical performance in people with chronic low back pain <span class=\"bp-inline-ref\">(Moseley, 2004)<\/span>. This suggests that the cognitive component of pain cannot be separated from its mechanical component, and that acting on one can influence the other.\n<\/p>\n\n<div class=\"bp-controversy\">\n  <h3>What should not be claimed too quickly<\/h3>\n  <ul>\n    <li><strong>\u201cUnderstanding the mechanism is enough to make the pain go away\u201d:<\/strong> education changes beliefs and behaviors, not necessarily all the biological processes involved.<\/li>\n    <li><strong>\u201cCentral sensitization explains all chronic pain\u201d:<\/strong> it often coexists with identifiable nociceptive or neuropathic mechanisms, which should not be ignored.<\/li>\n    <li><strong>\u201cMoving more, no matter how, solves the problem\u201d:<\/strong> what matters is the variability and gradual progression of movement, not just its quantity.<\/li>\n  <\/ul>\n<\/div>\n\n<p>\n  If fear of movement can feed the loop, the opposite question naturally arises: how can movement variability help ease it?\n<\/p>\n\n<h2 id=\"6-pourquoi-reintroduire-de-la-variabilite-mecanique\">6. Why reintroduce mechanical variability?<\/h2>\n\n<p>\n  Viewed more broadly, hypersensitization can be understood as a lasting imbalance between the nervous system\u2019s protective mechanisms and its recovery mechanisms. As long as the two remain in balance, a protective response stays useful and temporary. When signals perceived as threatening keep recurring and recovery becomes insufficient, however, the system can remain on alert longer than necessary \u2014 to the point of settling into chronic overprotection, even in the absence of any current threat.\n<\/p>\n\n<div class=\"bp-figure\">\n  <img decoding=\"async\" src=\"https:\/\/blueportance.com\/wp-content\/uploads\/VII.5.When-the-system-protects-more-than-it-recovers.png\" alt=\"Protection\u2013recovery balance progressing from healthy regulation to chronic overprotection.\" loading=\"lazy\">\n<\/div>\n<p class=\"bp-figure-caption\">\n  <strong>Figure 5 \u2014 When the system protects more than it recovers.<\/strong> Chronic pain appears when protective mechanisms remain activated over the long term while recovery mechanisms become insufficient to restore the balance.\n<\/p>\n\n<p>\n  Restoring this balance therefore does not rely on a single lever: mechanical variability, better-quality recovery, reduced hypervigilance, and a gradual return to activities all contribute together. Blue Portance focuses specifically on the first of these levers, mechanical variability, without claiming to cover the others in place of qualified professionals.\n<\/p>\n\n<p>\n  Reducing hypersensitization through this mechanical lever is not simply a matter of increasing the volume of activity. Above all, it involves diversifying the mechanical information transmitted to the nervous system, through gentle, frequent, and progressive movements rather than through a one-off, intense effort.\n<\/p>\n\n<p>\n  Postural micro-adjustments, shifts in weight-bearing, or small tilting movements can thus help restore a better distribution of stresses and promote fascial gliding. As a result, the signals transmitted to the nervous system become less repetitive and, potentially, less likely to be interpreted as a persistent threat.\n<\/p>\n\n<p>\n  This approach also fits alongside rehabilitation techniques based on graded exposure to movement and with therapeutic education about pain mechanisms, without replacing either one.\n<\/p>\n\n<div class=\"bp-recognize\">\n  <h3>Clues suggesting an active hypersensitization component<\/h3>\n  <ul>\n    <li>pain that is disproportionate to the apparent trigger;<\/li>\n    <li>pain that gradually spreads beyond its initial area;<\/li>\n    <li>increased sensitivity to light touch or to contact that is usually non-painful;<\/li>\n    <li>worsening associated with anticipation or fear of movement.<\/li>\n  <\/ul>\n<\/div>\n\n<p>\n  In the Blue Portance reading, an improvement when positions and weight-bearing become more varied is a biomechanical observation worth noting; it is not, however, a recognized sign of central sensitization.\n<\/p>\n\n<h3>A system capable of recalibrating<\/h3>\n\n<p>\n  This imbalance is not fixed, however. The same plasticity mechanism that allows the nervous system to become more reactive also allows it, gradually, to return to more balanced functioning when reassuring, varied, and repeated experiences come to replace the signals perceived as threatening.\n<\/p>\n\n<div class=\"bp-figure\">\n  <img decoding=\"async\" src=\"https:\/\/blueportance.com\/wp-content\/uploads\/VII.6.The-nervous-system-can-regain-balance.png\" alt=\"Progressive nervous system recalibration through variability, recovery, reassuring experiences and neuroplasticity.\" loading=\"lazy\">\n<\/div>\n<p class=\"bp-figure-caption\">\n  <strong>Figure 6 \u2014 The nervous system can regain its balance.<\/strong> Hypersensitization is not irreversible. Thanks to the plasticity of the nervous system, reassuring experiences, recovery, and variability allow the protective mechanisms to recalibrate progressively.\n<\/p>\n\n<p>\n  This recalibration nevertheless remains gradual and specific to each person: it depends on the regularity of the changes introduced, not on an isolated one-off effort. Nor does it remove the need for a medical evaluation when the situation warrants it.\n<\/p>\n\n<p>\n  This understanding does, however, have limitations that should be spelled out.\n<\/p>\n\n<h2 id=\"7-limites-et-controverses\">7. Limitations and controversies<\/h2>\n\n<p>\n  The mechanisms presented here are documented separately in the scientific literature, but how they fit together precisely in a given person remains difficult to establish clinically. No routine test can currently measure a patient\u2019s degree of central sensitization directly, and attributing pain to this mechanism remains, for the most part, a process of exclusion and of converging evidence rather than direct proof.\n<\/p>\n\n<p>\n  Furthermore, the hypothesis that the fascial network plays a role as a body-wide signaling system remains debated and less firmly established than the mechanisms of central sensitization themselves. It is a useful avenue for understanding, not a scientific certainty.\n<\/p>\n\n<p>\n  Once these limitations have been stated, they do not prevent concrete practical implications from being drawn.\n<\/p>\n\n<h2 id=\"8-consequences-pratiques-pour-comprendre-une-situation\">8. Practical implications for understanding a situation<\/h2>\n\n<ul>\n  <li><strong>Trigger:<\/strong> is the pain still associated with identifiable situations (position, movement, exertion), even if the response seems excessive?<\/li>\n  <li><strong>Distribution:<\/strong> has the pain spread beyond the area where it first appeared?<\/li>\n  <li><strong>Sensitivity:<\/strong> have light or usually non-painful contacts become sensitive?<\/li>\n  <li><strong>Variability:<\/strong> does the pain vary depending on the diversity of positions and weight-bearing?<\/li>\n  <li><strong>Behavior:<\/strong> has movement avoidance set in, and since when?<\/li>\n  <li><strong>Course:<\/strong> is the pain still linked to a trigger, or does it now appear spontaneously and at rest?<\/li>\n<\/ul>\n\n<p>\n  Pain that becomes spontaneous, migrates without an identifiable trigger, or persists at rest warrants reassessment, as it may signal a shift toward more self-sustaining pain \u2014 a situation addressed specifically in another article in this guide.\n<\/p>\n\n<div class=\"bp-takeaway\">\n  <h2 id=\"a-retenir\">Key takeaways<\/h2>\n  <ul>\n    <li>Pain without visible damage is not imaginary pain: it may reflect a nervous system that has become hypersensitive.<\/li>\n    <li>Hypersensitization is not a fourth pain mechanism: it can accompany nociceptive, neuropathic, or nociplastic pain.<\/li>\n    <li>Central sensitization lowers the pain-triggering threshold, amplifies the response, and can spread it beyond the initial area.<\/li>\n    <li>It rarely results from a single cause: mechanical stresses, pain history, behaviors-emotions-cognitions, and lack of recovery interact and reinforce one another.<\/li>\n    <li>It corresponds to a lasting imbalance between protection and recovery, rather than to an inevitable fate.<\/li>\n    <li>Mechanical variability, recovery, and reduced hypervigilance are among the levers available to gradually recalibrate the system.<\/li>\n    <li>This mechanism remains distinct from pain that has become spontaneous and autonomous, which is covered in another article in the guide.<\/li>\n  <\/ul>\n<\/div>\n\n<section class=\"bp-faq\">\n  <h2 id=\"questions-frequentes\">Frequently asked questions<\/h2>\n\n  <details>\n    <summary>What is central sensitization?<\/summary>\n    <div class=\"faq-content\">\n      It is a prolonged but reversible increase in the excitability of neurons in the pain pathways, following repeated or intense nociceptive activity. In concrete terms, it shows up as a lower triggering threshold, an amplified response, and possible spreading of the pain.\n    <\/div>\n  <\/details>\n\n  <details>\n    <summary>Why do I hurt when my MRI is normal?<\/summary>\n    <div class=\"faq-content\">\n      An MRI detects structural lesions, not the functional state of the pain-processing system. Pain can therefore be biologically real and intense without any structural abnormality being visible on imaging.\n    <\/div>\n  <\/details>\n\n  <details>\n    <summary>What is the link between fascia and chronic pain?<\/summary>\n    <div class=\"faq-content\">\n      Fascia is richly innervated and continuously transmits mechanical information to the nervous system. When the stresses acting on it remain continuous, localized, and poorly varied, the signals transmitted can therefore become more repetitive, which may help sustain hypersensitization that is already established.\n    <\/div>\n  <\/details>\n\n  <details>\n    <summary>Why can micro-movements reduce pain?<\/summary>\n    <div class=\"faq-content\">\n      They reintroduce variability into mechanical stresses, promote fascial gliding, and diversify the signals transmitted to the nervous system, which can gradually reduce the system\u2019s hypervigilance.\n    <\/div>\n  <\/details>\n\n  <details>\n    <summary>How can amplification of a real signal be distinguished from pain that has become autonomous?<\/summary>\n    <div class=\"faq-content\">\n      When the pain remains linked to identifiable triggers, even if disproportionately amplified, it corresponds to the mechanism described in this article. When it appears without a clear trigger, migrates, or persists at rest, it reflects a different situation, covered in another article in this guide.\n    <\/div>\n  <\/details>\n\n  <details>\n    <summary>Is nervous system hypersensitization reversible?<\/summary>\n    <div class=\"faq-content\">\n      It is partially reversible in many people, thanks to the plasticity of the nervous system. Recalibration nevertheless remains gradual and depends on the regularity of the reassuring experiences reintroduced, not on an isolated one-off effort.\n    <\/div>\n  <\/details>\n<\/section>\n\n<div class=\"bp-cta\">\n  <h2 id=\"vous-cherchez-a-comprendre-ce-qui-entretient-vos-douleurs-en-position-assise\">Trying to understand what keeps your sitting-related pain going?<\/h2>\n  <p>\n    The analysis is based on location, stresses, mechanical variability, and the mechanisms likely to combine.\n  <\/p>\n  <a href=\"https:\/\/blueportance.com\/en\/personalized-pain-analysis\/\">Analyze my situation \u2192<\/a>\n<\/div>\n\n<p class=\"bp-note\">\n  <strong>Note:<\/strong> this content explains general mechanisms. It cannot be used to diagnose a state of central sensitization remotely or to choose a treatment. Pain that persists, worsens, or changes in character should be discussed with a healthcare professional.\n<\/p>\n\n<section class=\"bp-references\">\n  <h2 id=\"references-scientifiques\">Scientific references<\/h2>\n  <h3>Central sensitization and neural plasticity<\/h3>\n  <ol>\n    <li>Woolf CJ. <em>Central sensitization: implications for the diagnosis and treatment of pain.<\/em> Pain. 2011;152(3 Suppl):S2\u2013S15. doi:10.1016\/j.pain.2010.09.030.<\/li>\n    <li>Latremoliere A, Woolf CJ. <em>Central sensitization: a generator of pain hypersensitivity by central neural plasticity.<\/em> Journal of Pain. 2009;10(9):895\u2013926.<\/li>\n    <li>Ji RR, Kohno T, Moore KA, Woolf CJ. <em>Central sensitization and LTP: do pain and memory share similar mechanisms?<\/em> Trends in Neurosciences. 2003;26(12):696\u2013705.<\/li>\n    <li>Vachon-Presseau E, Centeno MV, Ren W, et al. <em>The emotional brain as a predictor and amplifier of chronic pain.<\/em> Journal of Dental Research. 2016;95(6):605\u2013612.<\/li>\n    <li>Flor H, Elbert T, Knecht S, et al. <em>Phantom-limb pain as a perceptual correlate of cortical reorganization following arm amputation.<\/em> Nature. 1995;375(6531):482\u2013484.<\/li>\n    <li>Kosek E, Cohen M, Baron R, et al. <em>Do we need a third mechanistic descriptor for chronic pain states?<\/em> Pain. 2016;157(7):1382\u20131386.<\/li>\n  <\/ol>\n  <h3>Fascia and mechanical signaling<\/h3>\n  <ol start=\"7\">\n    <li>Schleip R, Findley TW, Chaitow L, Huijing PA (eds). <em>Fascia as a sensory organ.<\/em> In: <em>Fascia: The Tensional Network of the Human Body.<\/em> Churchill Livingstone\/Elsevier. 2012.<\/li>\n    <li>Langevin HM. <em>Connective tissue: a body-wide signaling network?<\/em> Medical Hypotheses. 2006;66(6):1074\u20131077.<\/li>\n  <\/ol>\n  <h3>Fear of movement, therapeutic education, and epidemiology<\/h3>\n  <ol start=\"9\">\n    <li>Vlaeyen JWS, Linton SJ. <em>Fear-avoidance and its consequences in chronic musculoskeletal pain: a state of the art.<\/em> Pain. 2000;85(3):317\u2013332.<\/li>\n    <li>Moseley GL. <em>Evidence for a direct relationship between cognitive and physical change during an education intervention in people with chronic low back pain.<\/em> European Journal of Pain. 2004;8(1):39\u201345.<\/li>\n<\/ol>\n  <h3>Further reading<\/h3>\n  <ul>\n    <li>Moseley GL. <em>Reconceptualising pain according to modern pain science.<\/em> Physical Therapy Reviews. 2007;12(3):169\u2013178.<\/li>\n    <li>Kabat-Zinn J, Lipworth L, Burney R. <em>The clinical use of mindfulness meditation for the self-regulation of chronic pain.<\/em> Journal of Behavioral Medicine. 1985;8(2):163\u2013190.<\/li>\n    <li>Bouhassira D, Lant\u00e9ri-Minet M, Attal N, Laurent B, Touboul C. <em>Prevalence of chronic pain with neuropathic characteristics in the general population.<\/em> Pain. 2008;136(3):380\u2013387.<\/li>\n  <\/ul>\n<\/section>\n\n<p class=\"bp-copyright\">\n  \u00a9 Gil Ayache. The concepts, diagrams, terminology, and principles presented on this page constitute a work protected by copyright. They are made available to Blue Portance under an intellectual property license agreement, without transfer of economic rights or of authorship.\n<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>Blue Portance \u2192 Knowledge Base \u2192 Understanding Pain \u2192 Nervous System Hypersensitization Blue Portance Expert Guides Understanding Pain The biological, mechanical, and neurophysiological mechanisms of pain. This article is part of the Expert Guide \u201cUnderstanding Pain\u201d. Reference article \u2014 Blue Portance Knowledge Base Why Does Pain Persist When Everything Looks Normal? 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