The Nervous System & Stress: How Stress Affects Our Bodies and Fascia

Have you ever noticed how your body feels after a particularly stressful day?

Maybe your shoulders are sitting a little closer to your ears, your jaw feels tight, or there's a familiar ache developing between your shoulder blades. You might not have done anything particularly strenuous, yet your body feels as though it's been working all day.

I think this is one of the most interesting things about the relationship between our minds and bodies. We can experience something emotionally, but the effects aren't necessarily limited to our thoughts.

Stress is a physiological experience, too.

Our nervous system communicates with tissues throughout the body, influencing everything from muscle activity and circulation to immune responses and pain perception. And one area that I find particularly fascinating is how these processes may influence our connective tissues, especially the fascia.

But to understand that relationship, we first need to explore what actually happens when we experience stress.

What Happens in the Nervous System When We're Stressed?

Our nervous system is constantly gathering information about what's happening within us and around us. It helps coordinate how we respond to our environment, including situations that require us to pay attention, take action, or protect ourselves.

When we encounter something stressful, several physiological systems begin working together.

One of these is the sympathetic branch of the autonomic nervous system, which helps prepare the body for activity. You might recognize this as part of the familiar fight-or-flight response.

Our heart rate may increase, breathing patterns can change, and blood flow is redistributed to support the body's immediate needs. Muscles may become more active as we prepare to respond.

At the same time, the hypothalamic-pituitary-adrenal axis, often called the HPA axis, helps coordinate hormonal responses to stress, including the release of cortisol.

These responses aren't inherently bad. They're important adaptations that help us respond to challenges.

The difficulty can arise when stress is persistent, recovery is limited, or our physiological responses become difficult to manage.

Think about how you might feel after spending an entire day rushing between responsibilities, dealing with difficult conversations, and worrying about everything you still need to accomplish.

Even when you finally sit down, you might notice that your body hasn't quite settled.

Your shoulders are still tense. Your breathing may feel shallow. Perhaps you're exhausted but having a difficult time relaxing.

Your body has been participating in those experiences all along.

Why Stress Can Make Our Muscles Feel Tight

One of the more recognizable physical responses to stress is an increase in muscle tension.

When we're preparing to respond to something challenging, our nervous system can influence how our muscles activate. We might brace our shoulders, tighten our jaw, or hold tension through our abdomen without consciously deciding to do so.

If these patterns happen frequently, they can contribute to feelings of fatigue, stiffness, or discomfort.

But I think there's an important distinction to make here.

A muscle feeling tight doesn't necessarily mean the tissue has physically shortened or become permanently restricted.

Sometimes the sensation of tightness reflects muscle activity. Other times, it may be influenced by pain sensitivity, fatigue, movement habits, or other physiological factors.

Our experience of tension is more complicated than simply identifying a muscle that needs to be stretched.

This becomes particularly relevant when we consider fascia, because muscles and connective tissues work together rather than functioning as completely separate structures.

What Is Fascia, and Why Does It Matter?

Fascia is a connective tissue system found throughout the body. It surrounds, supports, separates, and connects different anatomical structures, including muscles, nerves, blood vessels, and organs.

Depending on the region, fascia contains varying arrangements of collagen, elastin, water, and other components of the extracellular matrix.

I like to think about fascia as part of the body's interconnected support system. It helps transmit mechanical forces, allows tissues to move in relation to one another, and contributes to our experience of movement and sensation.

But fascia isn't simply passive wrapping around our muscles.

Research has demonstrated that many fascial tissues contain sensory nerve fibers, including receptors involved in detecting mechanical information and potentially harmful stimuli.

A systematic review of fascial innervation found evidence of sensory and pain-related nerve fibers within different fascial structures, supporting the idea that fascia can contribute to both body awareness and pain (Fede et al., 2022).

This means fascia is not only influenced by mechanical forces. It is also connected to the nervous system through sensory signaling.

And that relationship becomes especially interesting when we begin exploring stress.

How Stress May Influence Fascia

When we talk about stress affecting fascia, I think it's important to separate what we know from what we're still learning.

We know that stress influences muscle activity, hormonal signaling, and immune function. We also know that fascia contains living cells that respond to mechanical and biochemical signals.

Some of those cells are called fibroblasts.

Fibroblasts help produce and maintain components of the extracellular matrix, including collagen. They're involved in normal tissue maintenance and repair.

Researchers have begun exploring how stress-related hormones, inflammatory signaling, and nervous system activity might influence fibroblast behavior and connective tissue function.

In a review examining stress, immunity, and fascia, Barsotti and colleagues (2021) describe possible relationships between neuroendocrine signaling, immune activity, fibroblasts, and myofibroblasts.

Myofibroblasts are specialized cells that can generate contractile forces and play important roles in tissue repair and fibrosis.

This raises some fascinating questions.

Could prolonged physiological stress influence connective tissue remodeling? Could changes in inflammatory signaling affect how certain tissues respond to mechanical forces? Might these processes contribute to some experiences of stiffness or discomfort?

These are reasonable questions to investigate.

However, we don't yet have strong clinical evidence demonstrating that everyday psychological stress directly causes fascia to become permanently tight through a single, predictable mechanism.

It's also important to remember that connective tissue responds to many influences, including movement, injury, inflammation, mechanical loading, and underlying health conditions.

Stress may be one part of that picture, but it isn't the whole story.

Stress, Inflammation, and Tissue Recovery

Another important connection between stress and our tissues involves the immune system.

Our immune system helps coordinate inflammation, tissue repair, and responses to injury. Stress-related hormonal and nervous system activity can influence these processes.

One area where this relationship has been studied is wound healing.

A systematic review and meta-analysis by Walburn and colleagues (2009) found that psychological stress was associated with poorer wound-healing outcomes across the studies examined.

This is particularly interesting because tissue healing depends on communication between immune cells, blood vessels, and connective tissue cells.

It demonstrates that our psychological experiences can be associated with measurable differences in physical recovery.

But we need to be careful about how we interpret that information.

Research showing that stress is associated with delayed wound healing doesn't automatically prove that stress creates fascial adhesions or causes chronic myofascial pain.

Different tissues, conditions, and physiological processes may respond differently.

What this research does help us understand is that our bodies aren't divided into completely separate physical and emotional systems.

Our nervous, endocrine, and immune systems communicate with one another, and that communication can influence how our tissues function.

The Relationship Between Stress and Chronic Pain

I think one of the most important things to understand about pain is that it isn't simply a measurement of how damaged or restricted a tissue is.

Pain is a complex experience influenced by information from the body, the nervous system, and the context in which we're experiencing it.

For someone living with chronic pain, stress may influence muscle guarding, sleep, emotional well-being, and how sensitive the nervous system becomes to certain sensations.

Sometimes an already painful area may feel more uncomfortable during a stressful period, even when there hasn't been a new injury.

That doesn't mean the pain is imaginary.

It means pain is influenced by more than tissue structure alone.

And while fascia can be a source of sensory information and pain, we can't assume that every uncomfortable sensation comes from fascial restriction.

This is particularly important for massage therapists and other bodyworkers.

If someone comes into our treatment room experiencing chronic tension, our job isn't necessarily to find the tissue that's holding their stress and force it to release.

Instead, we can begin considering the many factors that might be contributing to their experience.

[Internal link: What Is Somatic Awareness? → published TMI somatic awareness article]

What Does This Mean for Massage Therapy?

As bodyworkers, we're often taught to identify restrictions, release tension, and restore movement.

And while hands-on techniques can be valuable, I think understanding the nervous system encourages us to approach those goals with a little more curiosity.

Imagine working with someone who has persistent tension through their neck and shoulders.

You might notice that the area feels firm or that certain movements are uncomfortable. But those observations don't tell us everything about why the client is experiencing pain.

Perhaps they're experiencing muscle guarding. Maybe their sleep has been poor, or they've been under significant stress. There could also be an underlying musculoskeletal condition contributing to their symptoms.

Rather than assuming the tissue needs increasingly aggressive pressure, we can consider how to create a treatment experience that feels supportive.

That might include slower touch, comfortable positioning, collaborative communication, movement, or allowing the client to guide the amount of pressure being used.

We can also help clients become more aware of their physical experiences without insisting that they immediately change them.

This is where somatic awareness becomes particularly useful.

When we encourage clients to notice what they're experiencing, we're giving them an opportunity to participate in their care rather than simply receiving treatment.

Of course, massage isn't a substitute for medical assessment when symptoms suggest an underlying condition. And no particular massage technique can guarantee changes in stress hormones, fascial structure, or nervous system regulation.

But we can approach the treatment room with a broader understanding of the person we're working with.

Working With the Body, Not Against It

At The Myosomatic Institute, our foundational philosophy is to work with the body, not against it.

And I think understanding the relationship between stress and our tissues helps explain why this matters.

When we encounter tension, pain, or discomfort, it's tempting to view those experiences as problems that need to be eliminated as quickly as possible.

But what if we began by becoming curious about the experience instead?

What if we recognized that the sensation of tightness might involve muscle activity, sensory processing, mechanical factors, or several different influences happening together?

Rather than assuming that more pressure will create more progress, we can begin considering what the individual in front of us actually needs.

This connects directly with the four pillars of the Myosomatic Method: Observe, Regulate, Rewrite, and Integrate.

[Internal link: Myosomatic Method → published TMI Method page, if available]

We begin by observing the experience. We explore ways to support regulation when appropriate. We work toward changing patterns or responses that may no longer be helpful, and we practice integrating those changes into everyday life.

Not every uncomfortable sensation needs to be fought against.

Sometimes understanding what we're experiencing gives us more options for how to respond.

Your Body Is More Than the Sum of Its Tissues

One of the things I love about studying the body is realizing just how interconnected everything is.

Our muscles don't function independently of our nervous system. Our connective tissues aren't isolated from immune signaling. And our experiences of stress, movement, and pain involve multiple systems working together.

We're still learning exactly how these relationships influence fascia and chronic pain.

But I think the research already gives us a valuable reason to move beyond the idea that every physical symptom must have a purely mechanical explanation.

It also reminds us that stress isn't a personal failure, and experiencing tension doesn't mean we're doing something wrong.

Our bodies are constantly responding to the demands placed upon them.

Sometimes those responses are helpful. Sometimes they become uncomfortable. And sometimes we need additional support to understand what's happening.

Rather than approaching our bodies as something we need to fight, we can begin learning how to work with them.

Because understanding the body isn't just about learning how to change it. Sometimes it's about learning how to listen.

If you'd like to explore that idea further, I invite you to read [Internal link: What Does Being Grounded Mean? → published TMI grounding article]. It explores how reconnecting with the present moment can help us develop greater awareness of our experiences without requiring ourselves to feel completely calm or relaxed.

References

Barsotti, N., Chiera, M., Lanaro, D., & Fioranelli, M. (2021). Impact of stress, immunity, and signals from endocrine and nervous system on fascia. Frontiers in Bioscience (Elite Edition), 13(1), 1–36. https://doi.org/10.2741/870

Fede, C., et al. (2022). Fascial innervation: A systematic review of the literature. International Journal of Molecular Sciences, 23(10), 5674. https://doi.org/10.3390/ijms23105674

Walburn, J., Vedhara, K., Hankins, M., Rixon, L., & Weinman, J. (2009). Psychological stress and wound healing in humans: A systematic review and meta-analysis. Journal of Psychosomatic Research, 67(3), 253–271. https://doi.org/10.1016/j.jpsychores.2009.04.002