Why Do Some People Never Fully Recover? Understanding the Interstitial Inflammatory Stasis Hypothesis
Dysautonomia.
Long COVID.
Chronic pain.
Post-concussion syndrome.
Fibromyalgia.
Chronic fatigue.
PTSD.
Autoimmune disease.
At first glance, these appear to be completely different conditions. Different symptoms. Different specialists. Different treatment approaches.
Yet many patients tell remarkably similar stories.
An infection came and went, but they never fully recovered.
The injury healed, but the pain remained.
The concussion resolved, but the brain fog persisted.
The trauma ended, but the nervous system never returned to normal.
Their lab work improved.
Their hormones improved.
Their diet improved.
And yet they still didn’t feel like themselves.
Why?
What if many of these seemingly unrelated conditions share a common physiological mechanism?
To understand IIS, however, we first need to understand fascia.
When most people hear the word fascia, they think of myofascia, the connective tissue surrounding muscles. But fascia is much more than that.
Every tissue in the body has fascia.
Fascia surrounds muscles, bones, nerves, blood vessels, organs, and even individual groups of cells. It separates structures from one another while simultaneously connecting them into a unified whole.
Modern fascial researchers increasingly describe fascia not as a single tissue, but as a body-wide continuum of connective tissues that support, separate, protect, nourish, and integrate every structure in the body.
In other words, fascia is not merely the tissue around muscles.
It is the organizational framework of the human body.
If you could somehow remove every organ, muscle, bone, blood vessel, and nerve while leaving only the fascial network intact, you would still see a recognizable three-dimensional outline of a human being.
For most of modern medical history, fascia was largely ignored. Anatomists often viewed it as little more than packing material. During dissections it was routinely cut away to expose the structures considered important: muscles, nerves, arteries, veins, and organs.
Today, that perspective is changing rapidly.
In many ways, fascia is where adipose tissue was twenty years ago.
Fat was once considered little more than a storage depot for excess calories. We now recognize adipose tissue as a dynamic endocrine organ involved in metabolism, inflammation, hormone regulation, and immune signaling.
Fascia appears to be undergoing a similar transformation.
Research increasingly suggests that fascia is one of the body’s largest sensory and communication networks. It contains mechanoreceptors, proprioceptors, nociceptors, immune cells, fibroblasts, blood vessels, lymphatic pathways, and extensive neurological connections.
Rather than being passive packaging material, fascia appears to function as a body-wide system that links movement, circulation, immunity, and nervous system regulation.
This emerging understanding helps explain why so many patients continue to struggle despite doing everything “right.”
Many of the patients who arrive in my office have already optimized their hormones. They are taking supplements. They have cleaned up their diets. They have improved their sleep. Some have worked with chiropractors, physical therapists, massage therapists, personal trainers, or functional medicine practitioners.
Yet they still have chronic pain.
They still have fatigue.
They still have brain fog.
They still have autonomic dysfunction, digestive issues, headaches, dizziness, or symptoms that seem to defy explanation.
The question becomes:
What are we missing?
One of the most compelling explanations may is the phenomenon known as Interstitial Inflammatory Stasis, or IIS.
When tissues are injured, infected, strained, compressed, or inflamed, inflammatory mediators are released into the extracellular environment. Under ideal circumstances, blood flow and lymphatic drainage remove these substances, allowing the tissue to heal and return to normal function.
But what if the inflammatory event itself affects the body’s ability to clear inflammation?
This is where the Interstitial Inflammatory Stasis hypothesis becomes particularly interesting.
Whether the initiating event is an infection, physical injury, repetitive strain, surgery, toxin exposure, autoimmune activation, or even chronic psychological stress, the body’s response is remarkably similar.
Inflammatory cytokines are released into the affected tissues as part of the normal healing process.
Under healthy circumstances, those inflammatory mediators help coordinate repair and are eventually cleared through the vascular and lymphatic systems.
The IIS model proposes that the very cytokines responsible for initiating healing can also interfere with the mechanisms responsible for clearing inflammation.
Research suggests that cytokines such as IL-1β, IL-6, and TNF-α may impair normal lymphatic pump function while simultaneously increasing sympathetic nervous system activity and reducing local microcirculation. At the same time, inflammatory signaling can stimulate fibroblasts to transform into contractile myofibroblasts, increasing fascial tension and potentially restricting fluid movement through pre-lymphatic and lymphatic pathways.
Chronic stress may contribute to this process as well. Elevated stress hormones and inflammatory cytokines such as IL-6 have been associated with prolonged stress states, creating another pathway through which the body can become trapped in chronic dysfunction.
The result is a feed-forward cycle.
Inflammation reduces drainage.
Reduced drainage allows inflammatory mediators to accumulate.
Accumulated inflammatory mediators create additional inflammation.
The body becomes trapped in a self-perpetuating state of altered physiology long after the original event has resolved.
This creates what has been described as Interstitial Inflammatory Stasis.
One reason the IIS model is so intriguing is that it attempts to answer questions that many existing pain models struggle to explain.
Traditional biomechanical models often focus on weakness, posture, mobility restrictions, movement dysfunction, stretching, stability, or joint mechanics.
More recent pain science has emphasized central sensitization, neuroplasticity, and changes within the nervous system itself.
Each of these models contributes valuable insights, but none fully explains why symptoms can persist for years after the original injury, infection, surgery, or inflammatory event has resolved.
What makes the IIS model particularly compelling is its explanatory power.
It potentially links chronic pain, autonomic dysfunction, post-infectious syndromes, visceral dysfunction, vascular disturbances, fatigue, and many idiopathic conditions through a common physiological mechanism rather than treating them as unrelated phenomena.
As a naturopathic doctor, this framework is particularly interesting because it integrates many of the factors we already know influence inflammation.
Hormones affect immune function.
Nutritional deficiencies affect tissue repair.
Sleep influences cytokine production.
Metabolic dysfunction alters inflammatory signaling.
Gut dysfunction can influence systemic immune activation.
Mitochondrial dysfunction can impair recovery.
These factors matter enormously and often need to be addressed.
However, the IIS model suggests that even after the original drivers of inflammation have been improved, residual regions of inflammatory stasis may persist.
In other words, correcting hormones, optimizing nutrition, reducing inflammatory triggers, improving mitochondrial function, and supporting metabolism may reduce the amount of inflammation entering the system, but patients may still struggle if inflammatory mediators have become trapped within dysfunctional fascial and interstitial pathways.
This may explain why some patients improve dramatically with hormone optimization, dietary changes, or supplementation, while others plateau despite doing everything correctly.
The biochemistry may have improved, but the physiology has not fully normalized.
Another framework that may complement the IIS model is Dr. Robert Naviaux’s Cell Danger Response.
According to Naviaux, when cells encounter threats such as infection, toxins, physical injury, metabolic dysfunction, or chronic stress, they can shift into a protective survival state.
In this state, cellular resources are redirected away from growth, repair, and normal communication and toward defense and survival.
From the perspective of the Cell Danger Response, many chronic illnesses may represent situations in which the body has successfully survived the original threat but has difficulty fully returning to a normal healing state.
The IIS model provides a tissue-level explanation for how that process is maintained.
If inflammatory mediators become trapped within regions of impaired circulation, lymphatic drainage, and fascial restriction, those tissues may continue generating danger signals long after the original trigger has resolved.
The cells within those regions may continue receiving biochemical messages that suggest a threat is still present, even when the initiating event is gone.
Viewed together, these models suggest a fascinating possibility:
The Cell Danger Response may describe what is happening inside the cell, while Interstitial Inflammatory Stasis may help explain what is happening in the tissue environment surrounding the cell.
This may be one reason why some patients continue experiencing fatigue, pain, autonomic dysfunction, cognitive symptoms, and impaired recovery despite addressing infections, hormones, nutrition, and other upstream contributors.
The original trigger may have improved, but the physiological signals maintaining the danger response may still be present.
Whether these models ultimately prove to be fully correct remains to be seen.
However, both point toward the same fundamental idea:
Chronic illness may not simply be the result of damaged tissues.
It may be the result of biological systems becoming trapped in protective states that they are unable to fully exit.
This framework also provides an interesting lens through which to view traditional healing systems.
Ancient Chinese medicine described channels of altered flow through the body using the concept of qi.
While the philosophical framework differs from modern physiology, these clinicians were observing real patterns of dysfunction involving connective tissue, fluid movement, autonomic regulation, and inflammation.
Today, emerging anatomy and physiology may allow us to describe these observations with greater precision. Rather than dismissing historical healing traditions, modern research may help us better understand the biological processes they were attempting to describe.
Throughout history, different cultures developed different languages for describing health, vitality, and dysfunction. While the underlying explanations often differed, many were attempting to understand the same reality: that the human body functions as an integrated whole rather than a collection of isolated parts.
Modern physiology does not necessarily replace these older observations. In many ways, it provides a more detailed map of the mechanisms through which they may operate.
What excites me most is where this is leading.
Medicine has spent centuries mapping anatomy.
We know the major arteries of the brain, including the middle cerebral artery, anterior cerebral artery, and posterior cerebral artery.
We know the major venous drainage pathways such as the superior sagittal sinus, transverse sinus, and internal jugular veins.
We know the spinal cord tracts, peripheral nerves, organs, and vascular systems with remarkable precision.
And yet anatomy alone does not tell us which tissues are irritated, inflamed, or dysfunctional in the live patient in front of us.
What is becoming increasingly interesting is that the nervous system appears to provide another kind of map.
Through the neurological principle of convergence, sensory information from muscles, fascia, blood vessels, organs, lymphatic tissues, and nerves enters the spinal cord and brainstem through shared neurological pathways.
This means inflammation arising from a deeper structure can create predictable changes in superficial tissues.
Internal dysfunction can become visible on the surface of the body.
In other words, the body may already be showing us where inflammation has altered physiology, circulation, lymphatic drainage, and nervous system function.
We simply have not known how to read the map.
This is the central insight that drew me to Fascial Counterstrain.
If convergence is real, then tenderness and tissue changes on the surface of the body are not random findings.
They represent a neurological and physiological map pointing toward deeper tissues that are struggling to recover.
This concept has profound implications.
Instead of relying exclusively on imaging studies, laboratory values, or symptom descriptions, clinicians may be able to identify specific regions of inflammatory stasis through predictable changes in tissue tension, tenderness, autonomic responses, fascial texture, and movement patterns.
At the same time, anatomy itself continues to evolve.
Recent discoveries such as the subarachnoid lymphatic membrane (SLYM) remind us that even now we are still identifying previously undescribed structures within the human body.
Researchers are also beginning to better understand the interstitial system, fascial continuities, lymphatic pathways, neuroimmune interactions, and the communication networks that exist between tissues.
These systems may ultimately help explain chronic pain, post-infectious syndromes, autonomic dysfunction, and many of the complex conditions that challenge modern healthcare.
For clinicians who enjoy solving difficult problems, it is an incredibly exciting time.
We are not discovering a new body.
We are uncovering deeper layers of order within one that has been there all along.
Each new discovery reveals a little more of the remarkable complexity, integration, and coherence that characterize living systems.
And increasingly, we are realizing that fascia is the tissue revealing where the problem is.
For those of us working with Fascial Counterstrain (Developed by Brian Tuckey, offered by the Jones Institute), this is what makes the work so fascinating.
The goal is not simply to treat symptoms.
The goal is to restore the conditions that allow the body’s natural processes of healing, regulation, and integration to resume.
The map is still being drawn.
But for the first time, we may finally be learning how to read it in real time, helping us move beyond simply managing symptoms and toward restoring the conditions that allow healing to occur.
And that may change the way we understand chronic illness for generations to come.
Dr Evan
References
Tuckey B, Srbely J, Rigney G, Vythilingam M, Shah J. “Impaired Lymphatic Drainage and Interstitial Inflammatory Stasis in Chronic Musculoskeletal and Idiopathic Pain Syndromes: Exploring a Novel Mechanism.” Frontiers in Pain Research. 2021. https://doi.org/10.3389/fpain.2021.691740