Hyperbaric Oxygen Therapy for Concussion: What Does the Science Actually Say?

Hyperbaric oxygen therapy—usually called HBOT—is increasingly discussed as a potential treatment for persistent symptoms following concussion and traumatic brain injury. But what exactly happens inside a hyperbaric chamber? Is the benefit simply from breathing more oxygen? Does pressure matter? And do we have enough evidence to say that HBOT works for chronic traumatic brain injury?

I recently had the opportunity to explore these questions with someone uniquely qualified to discuss them: Dr. Joseph Dituri, PhD—better known as “Dr. Deep Sea”. Dr. Dituri spent 28 years in the United States Navy working in diving, special operations, deep submergence, and undersea systems. He later earned a PhD in biomedical engineering, became involved in traumatic brain injury research, and then sustained a TBI himself.

Today, his work includes clinical research investigating HBOT in veterans with traumatic brain injury. He also holds a Guinness World Record after spending 100 days living underwater during Project Neptune 100. Our conversation offered a fascinating window into what we know about HBOT—and, just as importantly, what researchers are still trying to figure out.

First: What Exactly Is Hyperbaric Oxygen Therapy?

The word itself gives us a clue: hyper means greater than normal, and baric refers to pressure. A hyperbaric chamber creates an environment in which atmospheric pressure is increased above normal sea-level pressure. Pressure is commonly described in ATA, or atmospheres absolute. At sea level, we live at approximately 1 ATA.

Inside a hyperbaric chamber, pressure can be increased above that level. In conventional medical protocols, a patient may also breathe oxygen at a higher concentration than ordinary room air—often 100% oxygen. This combination changes how much oxygen can be carried in the blood, including the amount dissolved directly into plasma. HBOT is not simply “giving the brain more oxygen”; it is a physiological intervention involving both oxygen concentration and pressure.

Why Might HBOT Matter After a Brain Injury?

A concussion initiates far more than a momentary disruption in brain function. It can involve energy metabolism, cerebral blood flow, neuroinflammation, autonomic regulation, oxidative stress, and cellular signaling. In people with persistent symptoms, researchers are investigating whether some of these abnormalities may continue well beyond the initial injury.

HBOT is particularly interesting because hyperbaric exposure may influence biological processes relevant to brain injury, including:

• Tissue oxygenation and vascular function
• Inflammatory and oxidative signaling
• Angiogenesis and neuroplasticity
• Mitochondrial function and neurotrophic signaling

That does not mean HBOT has been proven to reverse all of these abnormalities in everyone with persistent post-concussion symptoms. It does help explain why researchers continue to study it.

Oxygen Isn’t the Whole Story: Pressure Matters

One of the most important points from our conversation is that HBOT is not one uniform treatment. Pressure itself is part of the dose. Different pressures may produce different physiological effects, which means that the question “I tried hyperbaric oxygen therapy” leaves out critical details.

These are not trivial details. They are part of the treatment protocol, and they are one reason comparing HBOT studies can become complicated: two studies described as “hyperbaric oxygen therapy” may not be investigating identical interventions.

Soft Chambers vs. Hard Chambers: Not Necessarily the Same Treatment

Portable or “mild” hyperbaric chambers generally operate at lower pressures than conventional medical hyperbaric systems. Medical chambers can achieve substantially higher pressures and may deliver 100% oxygen according to a prescribed protocol.

That does not automatically mean that more pressure is better. A more useful question is: What physiological response are you trying to produce? Higher pressures also introduce different risks and safety considerations. We are still learning what dose is appropriate for which biological target.

Could Lower Pressures Affect Neuroinflammation?

After brain injury, inflammatory signaling can be both helpful and harmful. The initial immune response participates in cleanup and repair, but persistent dysregulation of inflammatory pathways is being investigated as one contributor to chronic neurological symptoms.

Dr. Dituri described research examining changes in inflammatory cytokines at different hyperbaric pressures and the possibility that some anti-inflammatory effects may occur at relatively modest pressure increases. This is an intriguing area of HBOT research, but it should not be translated into universal clinical prescriptions. There is not currently a single established “anti-neuroinflammation pressure” proven to be optimal for every person with persistent concussion symptoms.

What About BDNF and Neuroplasticity?

Our conversation also explored alternating oxygen exposures and HIF-1α, or hypoxia-inducible factor-1 alpha. HIF pathways help cells respond to changes in oxygen availability. Oxygen-related signaling intersects with pathways involved in vascular adaptation, metabolism, cellular survival, and potentially neuroplasticity.

Dr. Dituri discussed experimental approaches intended to stimulate adaptive signaling pathways, including pathways associated with brain-derived neurotrophic factor, or BDNF. BDNF is sometimes described as “fertilizer for the brain” because it supports synaptic plasticity and neuronal function. It is a compelling hypothesis, but this remains active research: observing two biological processes together does not prove that manipulating one will produce meaningful clinical recovery.

Safety: HBOT Is Not a Biohacking Playground

If hyperbaric oxygen creates a temporary physiological environment that may support plasticity, it is natural to wonder whether cognitive, visual, breathing, or meditation exercises could be paired with it. This is an area clinicians and researchers may investigate more intelligently over time.

But there is a major safety caveat. A hyperbaric chamber is an oxygen-enriched, pressurized environment. Equipment that produces heat, sparks, friction, or electrical hazards can become dangerous. Do not casually bring red-light devices, phones, batteries, exercise equipment, or other electronics into a chamber because you saw someone combine them online. Follow the safety requirements of the individual chamber and facility.

How Many HBOT Sessions Are Needed for Brain Injury?

The honest answer is that we do not know yet. Protocols being investigated for traumatic brain injury often involve considerably more than a handful of treatments, with courses sometimes falling in the range of roughly 25–40 sessions. That can mean weeks of frequent appointments, substantial time, and potentially significant out-of-pocket expense.

Questions that future research needs to answer include the minimum effective dose, whether particular TBI phenotypes require different treatment doses, whether injury chronicity matters, and how clinicians can identify responders and nonresponders. If you are considering HBOT, establish meaningful outcomes before beginning treatment rather than simply hoping you feel different after treatment number 40.

One of the Largest HBOT/TBI Research Efforts Yet

Dr. Dituri is participating in a large clinical research effort investigating HBOT in veterans with traumatic brain injury. The researchers are looking beyond the question “Do you feel better?” and collecting a broad set of objective measures.

• Blood, urine, saliva, and inflammatory markers
• Electrocardiography and electroencephalography (EEG)
• Pulmonary function measures
• MRI and diffusion-based neuroimaging

Why Brain Imaging and Sex-Based Analysis Matter

Advanced MRI techniques such as diffusion tensor imaging examine characteristics of water diffusion through white matter and can provide information about white-matter microstructure. Unlike a routine structural MRI—which is frequently normal after concussion—advanced imaging can sometimes detect group-level differences associated with TBI that are not visible on conventional imaging.

The research also includes sex-based analyses. Simply including women in research is not enough; investigators also need to examine whether treatment responses differ by sex. Biological sex may influence concussion risk, symptom burden, recovery trajectory, hormonal responses, migraine susceptibility, and other aspects of brain injury. We should not automatically assume that a treatment dose established primarily in men will produce an identical physiological response in women.

Why Isn’t HBOT Already Standard Treatment for Concussion?

There is research suggesting potential benefits of HBOT for some people with traumatic brain injury, as well as studies with negative, mixed, or difficult-to-interpret findings. Hyperbaric trials are especially challenging because creating an appropriate placebo or “sham” condition is difficult: pressure itself may have physiological effects, but without pressure participants may realize they are not receiving the intervention.

Studies have also used different pressures, oxygen concentrations, treatment durations, session counts, injury severities, time periods since injury, and outcome measures. Consequently, HBOT is not currently an FDA-approved treatment specifically for concussion or chronic post-concussion syndrome. It is an established medical treatment for several other conditions, while its use for persistent concussion and TBI symptoms remains an area of active investigation.

Better Questions to Ask When Considering HBOT

Meaningful outcomes might include symptom scales, headache frequency, cognitive testing, exercise tolerance, sleep measures, balance testing, or other clinically appropriate objective measures. The future of concussion care is not another universal protocol; it is better phenotyping, better biomarkers, and more individualized treatment. HBOT may ultimately become one piece of that puzzle. Science still needs to tell us which piece, for whom, at what dose, and when.

This article is educational and is not a substitute for individualized medical advice. If you are considering HBOT or have persistent or worsening symptoms, discuss your situation with a qualified healthcare professional.