Hyperbaric Oxygen Therapy for Fibromyalgia: Can HBOT Help with Chronic Pain?

Imagine waking up every morning feeling like you ran a marathon in your sleep. Your muscles ache, your joints burn, and no amount of rest makes it better. For roughly 4 million Americans living with fibromyalgia, that is not a bad day — it is every day.

Standard treatments — antidepressants, anticonvulsants, physical therapy — help some people, but many patients still struggle with debilitating pain, fatigue, and brain fog. That gap between what medicine offers and what patients actually need has driven researchers to explore alternatives. One of the most promising: hyperbaric oxygen therapy.

Clinical trials now suggest that breathing pure oxygen under pressure may reduce fibromyalgia tender points by half and triple pain thresholds. But how strong is the evidence? And is this something your doctor would actually recommend?

Here is what the research shows, what treatment looks like, and how to decide if it is worth exploring.

What is fibromyalgia?

Fibromyalgia is a chronic pain condition characterized by widespread musculoskeletal pain, fatigue, sleep disturbances, and cognitive difficulties often called "fibro fog." It affects roughly 2% of the adult population, with women diagnosed at significantly higher rates than men.

What makes fibromyalgia particularly frustrating is that there is no definitive diagnostic test. Doctors diagnose it based on symptom patterns — widespread pain lasting at least three months with no other underlying condition to explain it.

The root cause remains debated. Current research points to central sensitization — the brain and spinal cord amplify pain signals, essentially turning up the volume on sensations that would not normally hurt. Brain imaging studies consistently show abnormal activity in pain-processing regions of fibromyalgia patients.

This is where hyperbaric oxygen therapy enters the picture. If fibromyalgia involves dysfunctional brain activity and impaired oxygen metabolism, could delivering concentrated oxygen directly to those tissues make a difference?

How hyperbaric oxygen therapy may help fibromyalgia

Hyperbaric oxygen therapy works by placing patients inside a pressurized chamber and having them breathe 100% pure oxygen at pressures typically between 1.5 and 2.4 ATA (atmospheres absolute). At these pressures, oxygen dissolves directly into blood plasma at levels 10 to 15 times higher than normal breathing.

For fibromyalgia specifically, researchers believe HBOT may help through several mechanisms:

Neuroplasticity and brain repair. The most compelling theory involves HBOT's effect on the brain itself. A landmark 2015 study published in PLOS ONE used SPECT brain imaging and found that HBOT induced beneficial changes in brain activity within regions previously associated with abnormal activity in fibromyalgia patients. In other words, the oxygen therapy appeared to help rewire dysfunctional pain-processing circuits.

Reduced inflammation. Fibromyalgia involves chronic low-grade neuroinflammation. Hyperbaric oxygen has well-documented anti-inflammatory properties, reducing inflammatory markers and oxidative stress that contribute to pain amplification.

Improved oxygen delivery to tissues. Fibromyalgia patients often show signs of impaired oxygen metabolism in muscle tissue. By flooding the body with dissolved oxygen, HBOT may address this deficit directly — reaching tissue that compromised blood flow cannot adequately supply.

Pain signal modulation. Studies suggest that repeated HBOT sessions can reduce central sensitization — the very mechanism believed to drive fibromyalgia pain. By calming overactive pain pathways, patients may experience lasting relief even after treatment ends.

If you are new to how this therapy works, our guide on hyperbaric chamber benefits covers the fundamentals. Ready to see what clinics near you offer? Browse hyperbaric oxygen therapy clinics on FindHBOT.

What the research shows: clinical trials and meta-analyses

The evidence for HBOT and fibromyalgia has grown substantially over the past decade. Here are the key studies.

The landmark 2015 trial: tender points cut in half

The most cited study is a 2015 prospective clinical trial published in PLOS ONE by Efrati et al. Researchers enrolled 60 women with fibromyalgia and divided them into a treatment group and a crossover control group.

The results were striking:

• Tender points dropped by a factor of 2 in the treatment group and by a factor of 3 in the crossover group
• Pain threshold tripled after treatment, measured by dolorimeter testing
• Fibromyalgia Impact Questionnaire (FIQ) scores improved significantly across pain, fatigue, morning tiredness, stiffness, anxiety, and depression
• SPECT brain imaging confirmed beneficial changes in brain activity patterns

The protocol: 40 sessions at 2.0 ATA, breathing 100% oxygen for 90 minutes per session, five days per week over eight weeks.

What makes this study particularly noteworthy is the brain imaging component. It did not just show patients felt better — it showed measurable changes in the brain regions responsible for their pain.

2023 systematic review and meta-analysis

A 2023 systematic review published in Rheumatology International analyzed the cumulative evidence for HBOT in fibromyalgia. The review confirmed that HBOT demonstrated significant improvements in pain outcomes and quality of life measures, while maintaining a favorable safety profile.

Meta-analysis of randomized controlled trials

A separate 2023 meta-analysis in Healthcare pooled data from four randomized controlled trials involving 163 participants. Key findings:

• Significant improvement in Fibromyalgia Impact Questionnaire scores at end of treatment
• Significant reduction in Tender Points Count
• The authors concluded that HBOT "could benefit fibromyalgia" based on the pooled evidence

While 163 participants across four trials is not a massive evidence base, the consistency of positive results across independent research groups is encouraging.

HBOT versus medication after traumatic brain injury

A 2023 randomized controlled trial compared HBOT directly against standard pharmacological treatment in fibromyalgia patients who had also suffered traumatic brain injury. HBOT showed favorable outcomes compared to medication alone, suggesting it may address the neurological underpinnings of fibromyalgia in ways that drugs cannot.

Low-pressure HBOT and quality of life

A 2024 study published in Therapeutic Advances in Musculoskeletal Disease examined the effects of low-pressure hyperbaric oxygen therapy on psychological well-being and quality of life in women with fibromyalgia. The results showed significant improvements in pain-related psychological constructs, adding to evidence that HBOT benefits extend beyond just physical pain reduction.

What treatment looks like: protocols and what to expect

If you are considering hyperbaric oxygen therapy for fibromyalgia, here is what a typical treatment protocol involves.

Number of sessions. Most clinical trials used 40 sessions as the standard protocol. Some patients report improvement after 15 to 20 sessions, but the full protocol appears necessary for maximum and lasting benefit.

Pressure levels. The most studied protocol uses 2.0 ATA with 100% oxygen. Some clinics offer low-pressure protocols (1.3 to 1.5 ATA), but the strongest evidence comes from standard-pressure treatments in medical-grade hard-shell chambers.

Session duration. Each session typically lasts 60 to 90 minutes of oxygen breathing time, plus time for pressurization and depressurization.

Frequency. Clinical trials used five sessions per week over eight weeks. In practice, many clinics offer three to five sessions per week depending on scheduling.

What it feels like. You will lie in a pressurized chamber — either a monoplace chamber (single person) or a multiplace chamber (several patients). You may feel pressure in your ears during pressurization, similar to an airplane descent. Most patients read, watch something on a device, or simply rest during the session.

If you have never been in a hyperbaric chamber, our guide on what to expect at your first session walks through the entire experience.

Side effects. HBOT for fibromyalgia uses the same pressures as other approved conditions. Common side effects include temporary ear pressure, mild fatigue after sessions, and rare instances of temporary vision changes. For a complete rundown, see our guide on hyperbaric oxygen therapy side effects.

Is hyperbaric oxygen therapy FDA-approved for fibromyalgia?

No. Fibromyalgia is not one of the 15 FDA-approved indications for hyperbaric oxygen therapy. This means HBOT for fibromyalgia is considered off-label use.

What does that mean in practice?

• Insurance typically will not cover it. Since fibromyalgia is not an approved indication, most insurance plans — including Medicare — will not reimburse HBOT for this condition. You should expect to pay out of pocket.
• Cost ranges from $150 to $400 per session depending on your location, clinic type, and chamber used. A full 40-session protocol could cost $6,000 to $16,000 out of pocket. Some clinics offer package discounts. For detailed pricing information, see our complete HBOT cost guide.
• Off-label does not mean unsupported. Many effective medical treatments are used off-label. The research supporting HBOT for fibromyalgia — including multiple RCTs and meta-analyses — is stronger than the evidence for several currently FDA-approved indications.
• Talk to your doctor. A physician familiar with hyperbaric medicine can help you evaluate whether the evidence supports trying HBOT for your specific situation, and can monitor your treatment.

Finding a clinic that treats fibromyalgia

Not all hyperbaric oxygen therapy clinics treat fibromyalgia. When searching for a provider, consider these factors:

Chamber type matters. The strongest research used medical-grade hard-shell chambers at 2.0 ATA. Soft-shell chambers typically operate at only 1.3 ATA — well below the pressures used in the landmark clinical trials. If you are pursuing HBOT based on the research described above, look for a clinic with hard-shell chambers.

Physician oversight. Look for clinics with a physician experienced in hyperbaric medicine who can evaluate your condition, adjust protocols, and monitor progress.

Experience with fibromyalgia. Ask whether the clinic has treated fibromyalgia patients before and what outcomes they have observed.

FindHBOT lists 93 clinics across the United States that specifically treat fibromyalgia with hyperbaric oxygen therapy. You can browse fibromyalgia treatment clinics to find providers near you, filtered by location and chamber type.

Frequently asked questions

How many HBOT sessions do you need for fibromyalgia?

Most clinical trials used 40 sessions as the standard protocol, delivered five times per week over eight weeks. Some patients report symptom improvement after 15 to 20 sessions, but the full 40-session protocol produced the most significant and lasting results in published research.

Does insurance cover HBOT for fibromyalgia?

Generally, no. Fibromyalgia is not an FDA-approved indication for hyperbaric oxygen therapy, so most insurance plans will not cover it. Patients typically pay $150 to $400 per session out of pocket. Some clinics offer package pricing for multi-session commitments.

How long do the benefits of HBOT for fibromyalgia last?

The 2015 Efrati trial showed improvements that persisted at follow-up assessments. However, fibromyalgia is a chronic condition, and some patients may benefit from periodic maintenance sessions. The optimal long-term protocol has not been definitively established in clinical research.

Is HBOT safe for fibromyalgia patients?

Yes, the meta-analyses reviewed found a favorable safety profile for HBOT in fibromyalgia treatment. Side effects are generally mild — temporary ear pressure, occasional fatigue, and rare transient vision changes. The pressures used (2.0 ATA) are the same as those used for FDA-approved conditions with decades of safety data.

Can you use a home hyperbaric chamber for fibromyalgia?

Home hyperbaric chambers are typically soft-shell units that operate at 1.3 ATA — significantly below the 2.0 ATA used in fibromyalgia research. While some patients report benefits from low-pressure protocols, the strongest clinical evidence comes from standard-pressure treatment in medical-grade facilities.

The bottom line

The evidence for hyperbaric oxygen therapy and fibromyalgia is genuinely encouraging. Multiple randomized controlled trials and two meta-analyses point in the same direction: HBOT can reduce tender points, increase pain thresholds, and improve quality of life for fibromyalgia patients.

The brain imaging data is particularly compelling. This is not just patients reporting they feel better — researchers can see measurable changes in the brain regions responsible for fibromyalgia pain.

That said, the research base is still relatively small (163 participants across the meta-analyzed trials), and fibromyalgia remains an off-label use. The out-of-pocket cost is real. But for patients who have tried standard treatments without adequate relief, the clinical evidence suggests HBOT deserves serious consideration.

Your next step: Browse the 93 hyperbaric oxygen therapy clinics on FindHBOT that treat fibromyalgia. Compare chamber types, check locations near you, and bring the research to your doctor.

Sources

1. Efrati S, et al. "Hyperbaric Oxygen Therapy Can Diminish Fibromyalgia Syndrome — Prospective Clinical Trial." PLOS ONE, 2015. PMC4444341
2. "Efficacy and safety of hyperbaric oxygen therapy for fibromyalgia: a systematic review and meta-analysis." Rheumatology International, 2023. PMC9872467
3. "Effectiveness of Hyperbaric Oxygen for Fibromyalgia: A Meta-Analysis of Randomized Controlled Trials." Healthcare, 2023. PMC10204569
4. "Hyperbaric oxygen therapy compared to pharmacological intervention in fibromyalgia patients following traumatic brain injury." PubMed, 2023. PMID 36897850
5. "Effects of a low-pressure hyperbaric oxygen therapy on psychological constructs related to pain and quality of life in women with fibromyalgia." Therapeutic Advances in Musculoskeletal Disease, 2024. PMID 38383268

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This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any treatment, including hyperbaric oxygen therapy.