The Link Between Stress and Autoimmune Disease: What Your Nervous System Is Trying to Tell You
Stress isn’t just “in your head”—it’s also in your bloodstream, your immune system, and your daily functioning. In recent years, science has drawn a bold line connecting chronic stress to the onset and progression of autoimmune diseases. This article explores how the nervous system, especially the vagus nerve, influences immune regulation, how stress disturbs this balance, and what you can do to protect your health. If you’ve ever suspected that your stress is making you sick, you’re probably right—and there’s something you can do about it.
The Nervous System and the Immune System: A Constant Conversation
If there’s a throughline in the story of modern biology, it’s this: everything is more connected than we thought. Nowhere is that more true than in the relationship between the nervous system and the immune system.
Let’s begin with the vagus nerve. Think of it as the body’s broadband network—running from the brainstem to the heart, lungs, and gut. It’s a key player in the parasympathetic nervous system, often referred to as “rest and digest.” When the vagus nerve is active, the body is calm, the heart rate slows, and inflammation tends to decrease. But when it’s underactive—often the case during chronic stress—the balance tips in the opposite direction.
This is not metaphorical. The vagus nerve helps regulate inflammation through what researchers call the “cholinergic anti-inflammatory pathway.” When vagal tone (a measure of its functioning) is strong, it sends calming signals to organs and to immune cells, telling them to chill out. When that tone is weak, the body is more likely to experience immune dysregulation, a state in which the immune system misfires or overreacts. And this misfiring isn’t benign—it lays the groundwork for stress-induced autoimmune disease.
This matters because the nervous and immune systems are not separate actors—they’re co-authors of the story of your physical and mental health. The more the nervous system stays in fight-or-flight, the more likely the immune system is to become reactive, misidentifying the body’s own tissue as a threat.
How Chronic Stress Shapes the Immune Response
Stress isn’t just a feeling. It’s a cascade of physiological events. When your body perceives a threat—real or imagined—it releases hormones like cortisol and adrenaline. These chemicals temporarily ramp up immune activity, prepping you to run from a lion or finish your taxes.
But chronic stress—say, the low-grade, ever-present strain of work deadlines, generalized anxiety, caregiving responsibilities, or unresolved trauma—keeps those systems on constant alert. Over time, the immune system stops responding as effectively. Some parts become hyperactive, others sluggish. This is immune dysregulation in action, and it sets the stage for a host of issues: persistent inflammation, higher susceptibility to illness, and in many cases, stress-induced autoimmune disease.
Why does this happen? One theory is that chronic stress interferes with regulatory T cells, the immune cells that normally suppress overactive immune responses. Another is that stress hormones alter the gut microbiome, weakening the gut barrier and increasing systemic inflammation, a known contributor to autoimmune disease and stress cycles.
This isn’t just an academic point. Conditions like lupus, rheumatoid arthritis, and multiple sclerosis are all impacted—if not outright triggered—by prolonged psychological stress. So if you’re experiencing a flare in symptoms around high-stress periods, it’s not in your head. It’s in your nervous system, which is in your immune system, which is in your joints, your skin, and your thyroid.
The Landmark Study Linking Trauma to Autoimmunity
In 2018, a research team led by Dr. Huan Song and colleagues at Harvard and the Karolinska Institute published a groundbreaking study in JAMA that made this mind-body connection clear.
They analyzed over 100,000 people in Sweden diagnosed with stress-related disorders (like PTSD and acute stress reactions) and compared them to over one million individuals without such diagnoses. Their findings? People with stress-related disorders had a 36% higher risk of developing an autoimmune condition. Even more striking, those with PTSD had up to a 46% higher risk.
Even more compelling was the fact that this association held strong even when comparing individuals to their own siblings, controlling for genetics and early environment. And here’s where it gets hopeful: individuals who received consistent treatment for trauma during the first year after diagnosis had a significantly reduced risk of developing autoimmune diseases.
Other studies have since echoed these results. Chronic stress doesn’t just make autoimmune diseases worse—it may actually cause them. In short: stress and autoimmune disease are not separate domains. They are overlapping Venn diagrams, with trauma and anxiety often sitting squarely in the center.
Caring for the Nervous System: More Than Self-Care
If this all sounds bleak, take a breath—literally. You have more power to intervene in this process than you might think. Here are five strategies to support your nervous system and reduce the risks of stress-induced autoimmune disease:
- Strengthen Vagal Tone – Breathing exercises, especially slow diaphragmatic breathing (inhale 4 counts, exhale 6 counts), stimulate the vagus nerve. Put your hand on your stomach and work to make your belly expand with the breath. Cold water exposure and humming or chanting can also help. A stronger vagus response means better regulation of both mood and immune function—think of it as daily maintenance for avoiding immune dysregulation.
- Make Movement Predictable – Regular exercise, particularly rhythmic aerobic activity like walking, swimming, or cycling, regulates cortisol levels and reduces systemic inflammation. Bonus: movement also boosts levels of brain-derived neurotrophic factor (BDNF), which supports neuroplasticity and better stress resilience.
- Prioritize Restorative Sleep – Sleep is when your immune system performs surveillance and repair. Disrupted sleep is associated with increased inflammation and worsened autoimmune disease and stress outcomes. Sleep isn’t just rest; it’s regulation.
- Gut Health as Immune Health – The gut microbiome heavily influences both immunity and mood. Functional medicine doctors often recommend diets high in fiber, fermented foods, and polyphenols that help stabilize immune responses, preventing the very cascades that lead to stress-induced autoimmune disease.
- Individual Therapy for Stress and Anxiety – This is where therapy becomes more than a coping mechanism—it’s a health intervention. Therapy helps you retrain your nervous system, understand your stress patterns, and build sustainable resilience. In therapy, you’re not just talking about your problems—you’re rewiring the circuitry that drives immune dysregulation.
As a therapist in Chicago who regularly sees clients managing both emotional distress and physical symptoms, I’ve watched therapy help regulate not just mood, but physical health. People report fewer flare-ups, reduced fatigue, and improved sleep—signs that the loop between autoimmune disease and stress is loosening. And it’s not just talk therapy anymore; somatic therapies, IFS, and ACT are all proving effective at calming the nervous system and preventing long-term immune wear and tear.
Why This Matters Now
The link between anxiety, stress, and autoimmune disease is not fringe science anymore. It’s a growing body of research, a public health issue, and—perhaps most importantly—a personal call to action. We live in a world that taxes the nervous system constantly, where rest is optional and hypervigilance is often rewarded.
But what if therapy were part of your preventive care? Not just something to do when you’re breaking down, but a tool for sustaining physical and emotional equilibrium?
Here in Chicago, we’re no strangers to stress—whether it’s the winter wind tunnels downtown or navigating the red line transfer at Belmont during rush hour. But just as the pedway system connects the city below the surface, there’s a deeper system in you that connects mind and body.
And you can care for it. Not alone, not perfectly, but intentionally. Individual therapy for stress and anxiety isn’t a luxury—it’s a frontline defense against stress-induced autoimmune disease, a strategy to prevent immune dysregulation, and one of the most powerful investments you can make in your long-term health.
If you’re ready to explore therapy for stress, anxiety, or chronic health concerns, reach out. Your nervous system is ready for a new conversation!
This blog is made for informational and educational purposes only. It is not medical advice. The information in this blog is not intended to (1) replace a one-on-one relationship with a qualified licensed health care provider, (2) create or establish a provider-patient relationship, or (3) create a duty for us to follow up with you.
