Hyperbaric Oxygen Therapy for PTSD and Veterans: Hope Beyond Traditional Treatment

Marcus served three tours in Afghanistan. He came home with nightmares that wouldn't stop, a temper he couldn't control, and a deep sense that the person he used to be was gone. After years of therapy and medication with limited relief, he tried something unexpected: breathing pure oxygen in a pressurized chamber. Within weeks, the nightmares became less frequent. Within months, his family noticed the difference.

Marcus isn't alone. An estimated 12 million adults in the United States live with post-traumatic stress disorder (PTSD) in any given year, and veterans are among the hardest hit. Between 11% and 20% of veterans who served in Operations Iraqi Freedom and Enduring Freedom develop PTSD. Standard treatments help many, but 30% to 50% of patients don't respond adequately to conventional approaches like therapy and medication.

That gap has driven researchers to explore hyperbaric oxygen therapy as a potential treatment for PTSD. The results so far are promising. A 2024 randomized controlled trial found that veterans who completed 60 sessions of hyperbaric oxygen therapy saw their PTSD symptom scores drop by nearly 40%, while the control group actually got worse.

This guide covers what the research shows, how hyperbaric oxygen therapy may help the brain heal from trauma, and how to find a clinic that treats PTSD.

Why traditional PTSD treatments don't work for everyone

The current standard of care for PTSD includes trauma-focused psychotherapy (such as cognitive processing therapy and EMDR) and medications like SSRIs. These treatments are well-established and help many people.

But they don't work for everyone.

According to research, approximately 30% to 50% of PTSD patients are classified as treatment-resistant, meaning they don't achieve meaningful symptom relief from first-line therapies. For veterans with combat-related PTSD, the numbers can be even more discouraging. Many veterans cycle through multiple medications and therapy approaches over years without finding lasting relief.

There's also a biological dimension that talk therapy alone may not address. PTSD isn't just a psychological condition. Brain imaging studies have revealed that trauma physically changes the brain, reducing blood flow, increasing inflammation, and disrupting neural connectivity. These structural and functional brain changes help explain why some people remain stuck despite their best efforts in therapy.

This is where hyperbaric oxygen therapy enters the picture. Rather than targeting symptoms through medication or behavioral change, it works directly on the brain's biology.

How hyperbaric oxygen therapy works for PTSD

Hyperbaric oxygen therapy delivers 100% oxygen at pressures higher than normal atmospheric levels, typically between 1.5 and 2.0 ATA (atmospheres absolute). At these pressures, oxygen dissolves directly into blood plasma, cerebrospinal fluid, and tissues at levels far beyond what normal breathing can achieve.

For PTSD, the proposed mechanisms include:

Reducing neuroinflammation. Chronic inflammation in the brain is a hallmark of PTSD. The surge of dissolved oxygen can help calm overactive inflammatory pathways, allowing damaged neural tissue to begin healing.

Promoting neuroplasticity. Hyperbaric oxygen therapy has been shown to stimulate the growth of new blood vessels (angiogenesis) and promote the formation of new neural connections. This is critical for PTSD recovery because trauma disrupts the brain's ability to process and integrate memories.

Restoring cerebral blood flow. Brain imaging studies of PTSD patients consistently show reduced blood flow in key regions, including the prefrontal cortex (responsible for rational thinking and impulse control) and the hippocampus (involved in memory processing). Increased oxygen delivery can help restore normal function in these areas.

Enhancing brain connectivity. The 2024 Israeli clinical trial used functional MRI scans and found that veterans who received hyperbaric oxygen therapy showed enhanced connectivity across three brain networks compared to the control group. These connectivity improvements correlated directly with clinical symptom improvement.

If you're exploring how HBOT works across different conditions, our research section covers 40+ verified clinical studies.

What the clinical research shows

The evidence for hyperbaric oxygen therapy and PTSD has grown significantly in recent years. Here are the most important studies.

The 2024 Israeli veteran trial

The strongest evidence comes from a randomized, sham-controlled trial published in the Journal of Clinical Psychiatry in 2024 by Doenyas-Barak, Efrati, and colleagues.

Study details:

• Participants: 63 veterans with combat-related PTSD, 56 completed
• Protocol: 60 sessions of 100% oxygen at 2.0 ATA, 90 minutes each
• Control: Sham treatment at 1.02 ATA with room air

Results:

Measure	HBOT Group	Sham Group
CAPS-5 score (before)	42.57	45.11
CAPS-5 score (after)	25.80	49.22
Change	-16.77 (improved)	+4.11 (worsened)
Statistical significance	p<.001	p=.011

The HBOT group saw a nearly 40% reduction in PTSD symptom severity. The sham group actually deteriorated. Depression scores also improved significantly in the treatment group.

Systematic review: 393 patients across eight studies

A 2024 systematic review published in Frontiers in Neurology analyzed eight clinical studies encompassing 393 total subjects with PTSD symptoms.

Key findings:

• Statistically significant symptom improvement across all studies
• Improvements met the threshold for "Reliable Change or Clinically Significant Changes" per National Center for PTSD guidelines
• Brain imaging confirmed physical changes: three studies showed functional and anatomical brain improvements alongside symptom relief
• Optimal treatment range: 40-60 sessions at 1.3 to 2.0 ATA

The review also identified an important safety note: at the highest oxygen doses, 30% to 39% of subjects experienced a temporary worsening of emotional symptoms before improving. This resolved and did not lead to lasting harm, but it underscores the importance of working with experienced clinicians.

The threshold effect

A 2025 study found evidence of a threshold effect for sustained PTSD symptom improvement. This means that a minimum number of sessions may be required before lasting benefits emerge. Patients who completed fewer sessions were less likely to maintain their gains.

This is consistent with clinical practice. Most HBOT protocols for PTSD involve 40 to 60 sessions, typically administered five days per week over 8 to 12 weeks.

PTSD and TBI: the overlapping conditions

For many veterans, PTSD and traumatic brain injury (TBI) go hand in hand. Blast exposure, the signature injury of modern warfare, can cause both conditions simultaneously. An estimated 82% of military TBI cases involve blast exposure, and many service members develop PTSD symptoms alongside their brain injury.

This overlap matters for treatment. Traditional approaches often treat PTSD and TBI as separate conditions, but hyperbaric oxygen therapy addresses both by working directly on the brain's physical structure and function.

Sarah, a Navy medic who survived an IED blast in Iraq, was diagnosed with both mild TBI and PTSD. Therapy helped with some of her anxiety, but she still struggled with memory problems, difficulty concentrating, and emotional numbness. After 40 sessions of hyperbaric oxygen therapy, she reported that "the fog started to lift." Her memory improved. She could follow conversations again. The emotional flatness that had made her feel disconnected from her children began to ease.

If you're researching how HBOT helps with brain injuries specifically, see our detailed guide on hyperbaric oxygen therapy for TBI and concussion recovery.

What to expect during HBOT treatment for PTSD

Understanding the treatment process can make it less intimidating. Here's a typical PTSD treatment protocol.

Treatment protocol

• Number of sessions: 40-60 (based on current research)
• Frequency: Five sessions per week (Monday through Friday)
• Duration per session: 60-90 minutes of pressurized oxygen
• Pressure: 1.5-2.0 ATA
• Total treatment time: 8-12 weeks

During each session

You'll enter either a monoplace chamber (for one person) or a multiplace chamber (for several people). The chamber is gradually pressurized, which you'll feel as mild pressure in your ears, similar to descending in an airplane. You breathe normally through a mask or hood delivering pure oxygen.

Most patients read, listen to music, or sleep during sessions. There's no pain involved.

Side effects to know about

HBOT for PTSD is generally well-tolerated. Common side effects include:

• Ear pressure or discomfort (most common, usually managed by swallowing or yawning)
• Temporary lightheadedness after sessions
• Fatigue in the first few weeks of treatment

The systematic review noted that 30% to 39% of patients at higher oxygen doses experienced a temporary increase in emotional symptoms, including heightened anxiety or vivid memories, before symptoms improved. This is important to discuss with your treatment team. They can adjust the protocol if needed.

For a complete overview of potential side effects, read our guide on hyperbaric oxygen therapy side effects.

Cost and insurance

PTSD is not currently an FDA-approved indication for hyperbaric oxygen therapy. This means most insurance plans, including TRICARE and VA benefits, won't cover it for this specific condition.

Out-of-pocket costs typically range from $200 to $400 per session. A full 40-60 session protocol would cost $8,000 to $24,000. Some clinics offer package pricing or payment plans.

However, if you have a co-occurring TBI diagnosis, some aspects of treatment may qualify for coverage under TBI-related indications. It's worth discussing with both your clinic and your insurance provider.

For more details on costs and coverage strategies, check our complete HBOT cost guide and insurance coverage breakdown.

How to find a clinic that treats PTSD

Not every hyperbaric oxygen therapy clinic has experience with PTSD patients. Here's what to look for.

Experience with PTSD and neurological conditions. Ask how many PTSD patients the clinic has treated and what protocols they follow. Clinics experienced with PTSD will be familiar with the emotional symptom exacerbation that can occur early in treatment and know how to manage it.

Hard-shell chambers at appropriate pressures. The clinical research used pressures between 1.5 and 2.0 ATA with 100% oxygen. Soft-shell chambers, which typically reach only 1.3 ATA with lower oxygen concentrations, may not be sufficient. Look for clinics with medical-grade hard-shell chambers.

Physician oversight. PTSD treatment with HBOT should involve a physician who monitors your progress and can adjust the protocol. This is especially important given the potential for temporary symptom increases.

Coordination with your existing care team. The best outcomes come when HBOT is part of a comprehensive treatment plan. Look for clinics willing to communicate with your therapist, psychiatrist, or VA care team.

FindHBOT lists 396 clinics across the United States that offer hyperbaric oxygen therapy for PTSD. You can browse PTSD treatment clinics filtered by location, or search all clinics and filter by the conditions they treat.

Frequently asked questions

Is hyperbaric oxygen therapy FDA-approved for PTSD?

No. PTSD is not among the 14 FDA-approved indications for hyperbaric oxygen therapy. Treatment for PTSD is considered off-label, which means insurance typically won't cover it. However, multiple clinical trials have shown statistically significant improvements, and research is ongoing. The evidence is strongest when PTSD co-occurs with traumatic brain injury.

How many HBOT sessions are needed for PTSD?

Current research protocols use 40 to 60 sessions, administered five days per week over 8 to 12 weeks. A 2025 study found evidence of a threshold effect, meaning a minimum number of sessions is required for lasting benefit. Stopping too early may not produce sustained improvement.

Can HBOT replace therapy and medication for PTSD?

No. Hyperbaric oxygen therapy is best considered as a complementary treatment, not a replacement for established therapies. The strongest results come when HBOT is used alongside psychotherapy and, when appropriate, medication. Think of it as addressing the biological component of PTSD while therapy addresses the psychological component.

Does the VA offer hyperbaric oxygen therapy for PTSD?

The VA does not currently offer HBOT as a standard treatment for PTSD. However, the Department of Defense has funded multiple clinical trials studying its effectiveness, and some VA medical centers have hyperbaric facilities that may offer treatment under research protocols. Veterans seeking HBOT typically access it through private clinics.

Is HBOT safe for veterans with TBI and PTSD?

Clinical trials have shown HBOT to be generally safe for veterans with co-occurring TBI and PTSD. The most notable side effect is a temporary increase in emotional symptoms (reported in 30-39% of patients at higher doses), which resolves as treatment progresses. Ear pressure and fatigue are common but manageable. Always work with a physician experienced in treating neurological conditions with HBOT.

The bottom line

The research on hyperbaric oxygen therapy for PTSD is still developing, but the results are encouraging. A sham-controlled trial with combat veterans showed a nearly 40% reduction in PTSD symptoms after 60 sessions, backed by measurable changes in brain connectivity on MRI. A systematic review of 393 patients found significant improvements across eight clinical studies.

For veterans and others living with treatment-resistant PTSD, these findings represent a genuine source of hope. Hyperbaric oxygen therapy doesn't replace proven treatments like therapy and medication. But for those who haven't found adequate relief through conventional approaches, it offers a biologically focused option that targets the brain changes underlying PTSD.

If you or someone you care about is considering hyperbaric oxygen therapy for PTSD, start by finding a clinic with experience treating this condition. FindHBOT lists 396 clinics offering PTSD treatment across the United States. You can also browse all clinics to find options near you.

The path forward starts with understanding your options. You've already taken that step.

Sources

1. Doenyas-Barak K, Kutz I, Lang E, et al. "Hyperbaric Oxygen Therapy for Veterans With Combat-Associated Posttraumatic Stress Disorder: A Randomized, Sham-Controlled Clinical Trial." Journal of Clinical Psychiatry, 2024. PubMed

2. Andrews SR, Harch PG. "Systematic review and dosage analysis: hyperbaric oxygen therapy efficacy in the treatment of posttraumatic stress disorder." Frontiers in Neurology, 2024. PubMed

3. Danan D, Grosskopf Y, Mayo A, et al. "Hyperbaric Oxygen Therapy for PTSD: Threshold Effect for Sustained Symptom Improvement." 2025. PubMed

4. Weaver LK, Ziemnik R, Deru K, Russo AA. "A Double-Blind Randomized Trial of Hyperbaric Oxygen for Persistent Symptoms After Brain Injury." 2025. PubMed

5. National Center for PTSD, U.S. Department of Veterans Affairs. "How Common Is PTSD in Adults?" VA.gov

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.