If you’ve ever been told your hormone levels are “normal”… but you still feel exhausted, foggy, anxious, or wired at night — you’re not alone.
Many people begin exploring functional medicine because something feels off — especially when symptoms of hormone imbalance or adrenal fatigue don’t seem to match their lab results. Stress feels harder to handle. Sleep isn’t restorative. Energy crashes mid-day. And often, the question becomes:
Is this my adrenals? My cortisol? My thyroid?
Hormones are powerful chemical messengers that regulate energy, mood, sleep, metabolism, and your response to stress. But here’s something that isn’t talked about enough: they don’t work in isolation.
They respond to signals from your brain, to inflammation in the body, to how well blood and oxygen circulate — and even to whether your nervous system feels safe or under threat.
At Michigan Health and Wellness Center in Traverse City, we often explain it this way: before asking how to “fix” a hormone, we need to ask whether the systems that regulate hormones are supported.
That’s where Hyperbaric Oxygen Therapy (HBOT) enters the conversation.
HBOT is not a hormone replacement therapy. It does not directly add cortisol, thyroid hormone, or estrogen to the body. Instead, it works upstream — at the level of oxygen delivery, blood flow, inflammation, and cellular signaling.
Emerging research shows that hyperbaric oxygen therapy can influence blood flow, inflammation, and cellular signaling pathways — systems that play an important role in regulating stress hormones.
So the better question may not be: “Can HBOT replace hormones?”
But rather: “Can improving oxygen and circulation help hormones function more effectively?”
Let’s break that down.
Understanding the HPA Axis: Your Body’s Stress Command Center
When people talk about “adrenal fatigue,” what they’re usually describing isn’t just an adrenal gland problem. It’s a stress system problem.
Your body has a built-in communication network called the HPA axis. That stands for:
- Hypothalamus (a control center in your brain)
- Pituitary gland (another small but powerful gland in the brain)
- Adrenal glands (which sit on top of your kidneys)
Think of it as your body’s stress command center. It constantly adjusts cortisol and other stress hormones in response to what your brain senses in your environment.
When you experience stress — emotional, physical, inflammatory, or even from lack of sleep — your brain signals your adrenal glands to release cortisol and other stress hormones to help you adapt.
In the short term, this system is incredibly helpful. It keeps you alert. It helps regulate blood sugar. It supports blood pressure. It allows you to respond to challenges.
But when stress becomes constant, the signaling can become dysregulated.
Instead of a smooth daily rhythm — with cortisol rising in the morning and tapering at night — the system may become:
- Overactive (feeling wired, anxious, restless)
- Under-responsive (feeling fatigued, flat, unmotivated)
- Or simply poorly timed (tired all morning, alert at night)
In conventional endocrinology, true adrenal failure is rare. What many people call “adrenal fatigue” is often better understood as dysregulation of the HPA axis — the body’s stress communication system. In other words, the adrenals themselves are usually not failing. The communication system regulating them is under strain.
Here’s something many people don’t realize: this system depends on more than hormones alone.
It depends on:
- Healthy blood flow
- Adequate oxygen delivery
- Balanced inflammation
- A regulated nervous system
If those foundational systems are struggling, your stress-response system may struggle, too.
This is where we begin to see why therapies that support circulation and cellular oxygen — like hyperbaric oxygen therapy — may be worth exploring as part of a larger resilience plan.
Not to replace hormones. But to support the environment in which they function.
Where Blood Flow Fits Into the Hormone Conversation
When most people think about hormones, they think about glands — the thyroid, the adrenals, the ovaries, the pancreas.
But there’s something just as important that often gets overlooked: Hormones must travel.
They travel through the bloodstream to tissues throughout the body. If circulation is impaired, communication between organs becomes less efficient.
This is where the health of your endothelium comes in. The endothelium is the thin inner lining of your blood vessels. It plays a powerful role in regulating:
- Blood flow
- Vessel dilation and constriction
- Inflammation levels
- Nitric oxide production (a natural compound that helps blood vessels relax and widen so blood can flow more easily)
Chronic stress has been shown to affect endothelial function. When the stress response stays activated for too long, inflammation and oxidative stress can increase. Over time, that can influence how well blood vessels respond and how efficiently oxygen and nutrients are delivered to tissues.
And remember — your adrenal glands, thyroid gland, and brain are tissues, too. They rely on steady oxygen delivery and healthy microcirculation to function well.
In a clinical study of patients with impaired blood vessel function, researchers reported that hyperbaric oxygen therapy was associated with improvements in flow-mediated dilation (FMD), along with favorable changes in nitric oxide and inflammatory markers.
This doesn’t mean HBOT “fixes hormones.” But it suggests that improving oxygen delivery and vascular health may support how hormone signals are carried throughout the body.
Instead of focusing only on hormone levels, it can be helpful to ask: Is the system delivering those hormones effectively?
Because resilient stress physiology isn’t just about what your body produces — it’s also about how efficiently it communicates. And this is where oxygen delivery becomes central to the conversation.
What Hyperbaric Oxygen Therapy Actually Does
To understand how hyperbaric oxygen therapy (HBOT) might support hormone balance, we first need to understand what it actually does.
During HBOT, you sit or lie comfortably inside a pressurized chamber while breathing concentrated oxygen. The increased pressure allows oxygen to dissolve directly into your blood plasma — not just attach to red blood cells.
Why does that matter?
Because dissolved oxygen can travel farther into tissues, including areas with reduced circulation or inflammation. This temporarily increases oxygen availability at the cellular level.
But oxygen isn’t just fuel for your cells — it also acts as a signal that can influence how your body repairs and adapts.
Research has shown that hyperbaric oxygen exposure can influence:
- Inflammatory pathways
- Oxidative stress signaling
- Angiogenesis (the formation of new blood vessels)
- Cellular repair mechanisms
In other words, HBOT doesn’t simply “add oxygen.” It can stimulate adaptive responses in the body — sometimes described as controlled, therapeutic stress that activates healing pathways.
This becomes especially important when we talk about stress physiology and hormone regulation. Chronic stress can increase inflammation and disrupt the body’s balance between damage and repair. Over time, this may affect how resilient your nervous system and endocrine system feel. Research suggests that hyperbaric oxygen may influence biological pathways involved in stress signaling and metabolic regulation.
It’s important to say clearly: HBOT is not a hormone therapy. It does not directly increase or replace cortisol, thyroid hormone, estrogen, or testosterone.
Instead, it may help support the terrain — oxygen delivery, circulation, inflammatory balance, and cellular repair — that allows hormone signaling systems to function more efficiently.
When we shift the focus from “fixing hormones” to supporting the systems that regulate them, the conversation becomes much more powerful.
HBOT and Stress Physiology: What the Research Suggests
If the HPA axis is your body’s stress command center, and blood flow helps carry its signals, the next logical question is: Can improving oxygen delivery influence how the stress system functions?
This is where the research is still developing — but promising. Most human studies on HBOT focus on blood vessel and metabolic health. These studies show changes in circulation and inflammation, which are closely connected to the body’s stress-response system.
There is also growing research exploring HBOT’s influence on metabolic health. A recent review of studies on hyperbaric oxygen therapy and insulin resistance — a condition linked to stress and metabolic health — reported changes in inflammatory markers and signs of improved vascular function in certain groups.
Why does that matter?
Because chronic stress does more than make us feel overwhelmed. It can influence blood sugar regulation, inflammation levels, sleep quality, and nervous system tone. All of these factors feed back into the HPA axis.
What we can responsibly say is this: hyperbaric oxygen therapy appears to influence several upstream systems — circulation, inflammation, oxidative signaling, and metabolic pathways — that interact with the body’s stress-response network. What we cannot say is that HBOT directly “resets” the HPA axis or corrects hormone levels.
For individuals experiencing chronic stress, slow recovery, or signs of nervous system overload, HBOT may serve as one supportive tool within a broader functional medicine plan focused on resilience.
The keyword is supportive.
Recovery from chronic stress usually requires more than one approach. It involves improving how your brain, glands, blood vessels, and nervous system communicate. When oxygen delivery improves, when inflammation is better regulated, and when circulation is supported, the body is often better equipped to respond to stress in a balanced way.
And that’s where another important piece of the puzzle comes in: training the nervous system itself.
Training the Stress Response: Where Biofeedback Fits In
Supporting oxygen delivery and circulation is one piece of the puzzle. But stress resilience isn’t only about chemistry. It’s also about patterns.
Your nervous system learns how to respond to stress over time. If it has been in “fight or flight” mode for months — or even years — that pattern can become automatic. Heart rate may stay elevated. Breathing may become shallow. Muscles may remain tense. Sleep may feel light and restless.
Even if hormone levels look normal on paper, the nervous system may still be operating in a heightened state. This is where biofeedback therapy can play an important role.
Biofeedback uses real-time measurements — such as heart rate variability (HRV), breathing patterns, or nervous system signals — to help you see how your body responds to stress. With guidance and practice, you can learn to shift those patterns.
Over time, this kind of training can improve:
- Heart rate variability (a marker of nervous system flexibility)
- Stress tolerance
- Emotional regulation
- Sleep quality
Why does this matter for hormones? Because the HPA axis is closely connected to the autonomic nervous system. When the nervous system is constantly activated, it continues to send stress signals downstream. When it learns to regulate more efficiently, that signaling can become more balanced.
This is where pairing therapies thoughtfully becomes powerful.
Hyperbaric oxygen therapy may support the biological terrain — oxygenation, circulation, and inflammatory balance.
Biofeedback helps retrain the control system — the brain and nervous system that initiate the stress response.
One supports the biological environment. The other supports the behavioral pattern. Together, they aim to improve resilience — not by forcing hormones to change, but by strengthening the systems that influence them.
Supporting the System — Not Replacing It
If you’ve been struggling with fatigue, poor stress tolerance, sleep disruption, or feeling “off” despite normal lab work, it can be frustrating. It’s natural to look for something that will fix the problem quickly.
But when it comes to the stress response system and hormone balance, quick fixes rarely lead to lasting change.
The HPA axis is a communication network. It depends on:
- Healthy nervous system regulation
- Efficient blood flow
- Adequate oxygen delivery
- Balanced inflammation
- Restorative sleep
- Nourishing lifestyle habits
Hyperbaric oxygen therapy is not a replacement for hormones. It is not a shortcut around foundational health practices. And it is not a cure-all.
What it may offer is support. By increasing oxygen availability and influencing circulation and cellular signaling pathways, HBOT may help create a more supportive internal environment — one in which your stress-response system can function more efficiently.
When combined with tools like biofeedback, nutrition, sleep optimization, and personalized functional medicine care, the goal shifts from “forcing hormones to change” to strengthening the body’s resilience.
That’s an important difference.
True adrenal recovery isn’t about pushing the system harder. It’s about helping the system communicate better.
If you’re curious whether hyperbaric oxygen therapy or biofeedback could be appropriate for your goals, the best first step is a thoughtful, individualized evaluation. Every stress pattern is different. Every recovery journey is personal.
The goal is not to override your hormones. It’s to help your body respond to stress with more balance and resilience. If you’d like to explore whether this approach fits your goals, our team is here to help you think through your options.
Resources
American Journal of Medicine. (2025). HPA axis dysfunction and stress-related disorders. The American Journal of Medicine. https://www.amjmed.com/article/S0002-9343(25)00353-5/fulltext
Frontiers in Medicine. (2025). Hyperbaric oxygen therapy and insulin resistance: A scoping review. Frontiers in Medicine. https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2025.1679615/full
Gündüz, A., et al. (2018). The effect of hyperbaric oxygen therapy on endothelial function in patients with slow coronary flow. Cardiology Journal, 25(2), 191–197. https://pubmed.ncbi.nlm.nih.gov/29512098/
Hadanny, A., & Efrati, S. (2020). The hyperoxic-hypoxic paradox. Biomolecules, 10(6), 958. https://pubmed.ncbi.nlm.nih.gov/32630465/
Harvard Health Publishing. (2023). Hyperbaric oxygen therapy: Evidence-based uses and unproven claims. Harvard Medical School. https://www.health.harvard.edu/staying-healthy/hyperbaric-oxygen-therapy-evidence-based-uses-and-unproven-claims