Can Hyperbaric Oxygen Therapy (HBOT) Help With Stroke Recovery?
- Sep 4, 2025
- 6 min read
Updated: Jan 9
Key Takeaways
Not standard care for stroke: HBOT is proven for a small number of conditions, but stroke is not one of them. The FDA has not approved HBOT for stroke recovery, and regulators have warned about unproven claims from some private clinics.
Chronic stroke research: Some small studies suggest HBOT might improve function or memory in people living with long-term deficits after stroke. These results are intriguing but limited by design issues like small sample sizes and lack of independent replication, so HBOT remains investigational for stroke and is usually not covered by insurance.
Safety: HBOT is generally safe under specialist supervision. Ear and sinus pressure problems are common. Temporary nearsightedness can develop during multiweek courses, and cataract progression has been reported in long-term use. Rarely, oxygen-toxicity seizures occur, and in one reported case, a seizure may have contributed to a stroke. An untreated collapsed lung (pneumothorax) is an absolute contraindication.
What HBOT Is and How It Works
During HBOT, a person sits or lies in a pressurized chamber while breathing nearly pure oxygen. The pressure is typically between 1.5 and 2.5 times normal atmospheric pressure. Under these conditions, oxygen dissolves directly into the blood plasma at levels much higher than can be achieved with oxygen delivered through a mask or nasal cannula.
In theory, this increased oxygen availability may help tissues that are injured or metabolically stressed. In the brain, proposed effects include reducing swelling, altering inflammatory signaling, supporting blood vessel growth, and promoting neuroplasticity, the brain’s ability to reorganize and adapt after injury.
These mechanisms are biologically plausible. What remains uncertain is whether they translate into meaningful, reliable improvements after stroke.
Some centers offer so-called “mild” hyperbaric therapy using lower pressures, often around 1.3 ATA, sometimes in soft-sided chambers. These approaches are not considered proven medical HBOT by hyperbaric medicine societies, and safety oversight varies widely.
What HBOT Treats in Stroke Care
Acute Stroke
For people experiencing an acute ischemic stroke, HBOT is not recommended. The only exception is when a stroke is caused by an air embolism, where HBOT can be lifesaving by reducing bubble size and speeding recovery.
Chronic Stroke
Interest in HBOT is much higher in the chronic phase of stroke, months or years after the initial injury. At this stage, many survivors have completed standard rehabilitation and are looking for additional options to improve function, cognition, energy, or quality of life.
A few small studies have explored HBOT for people months or years past their stroke. One well-known trial using 40 sessions at 2.0 ATA for 90 minutes reported improvements in function and quality of life, with brain scans showing activity in previously “silent” areas (Efrati and colleagues 2013). Another study suggested memory benefits (Hadanny and colleagues 2020).
These results are encouraging, but they came from a single research group, and the studies have been criticized for small sample sizes, inconsistent protocols, and limited controls. They have not yet been confirmed in larger, multi-center trials.
Importantly, a more recent randomized controlled trial by Harrison and colleagues (2024) tested HBOT in people 6–36 months post-stroke and found no meaningful benefit. In fact, outcomes on the Stroke Impact Scale-16 slightly favored the control group, leading the authors to conclude that HBOT should not be recommended for chronic stroke outside of research settings.
That means HBOT for stroke is still considered experimental.
Survivor Story: How HBOT Helped Dominica Padilla
Individual experiences vary. The research is still evolving, yet personal stories can help survivors understand what a course looks like and how it impacted that individual.
Dominica Padilla, co-founder of RebuildAfterStroke.org, experienced a stroke in September 2024. In the months that followed, she worked hard through traditional rehabilitation therapies. By December, however, she felt her recovery had stalled.
Looking for a way to regain momentum, Dom decided to try HBOT.
She committed to 43 one-hour sessions over two months, attending daily treatments in a hyperbaric chamber. The schedule was demanding, but she soon noticed meaningful changes.
What Changed for Dom:
Her vision improved
She experienced less pain
Her energy levels increased, a common struggle for many survivors
The treatment came at a cost. Insurance did not cover the $11,000 expense, but Dom felt it was a worthwhile investment.
“I finally felt like I was moving forward again,” she said. “It gave me momentum when I needed it most.”
Dom’s results align with the type of protocols used in research, yet responses differ by person. Her story is inspiring, but it should be viewed as an individual case, not a guarantee. Some clinics market HBOT as a guaranteed cure, which is misleading. Survivors should be cautious of facilities that promise more than current science supports.
How Effective Is HBOT for Stroke?
Acute stroke: No proven benefit, except in cases of air embolism.
Chronic stroke: Small studies suggest possible improvements in selected patients, especially in cognition, but the certainty of evidence is low.
The safest path, if you are interested, is to pursue HBOT within a clinical trial.
Safety and Side Effects
When delivered under proper medical supervision, hyperbaric oxygen therapy is generally considered safe, but it is not risk-free.
The most common issues involve pressure effects on the ears and sinuses, similar to what some people experience during air travel. Temporary nearsightedness can develop during multi-week treatment courses and usually resolves after therapy ends. Claustrophobia is also common.
More serious risks are rare but real. Oxygen-toxicity seizures can occur, typically brief and without long-term consequences. Lung injury is possible in people with certain underlying conditions. Cataract progression has been reported with prolonged or repeated courses.
An untreated pneumothorax, or collapsed lung, is an absolute contraindication to HBOT.
What a Typical HBOT Course Looks Like
Pre-treatment evaluation: A physician reviews your medical history, medications, lung and ear health, and screens for contraindications.
The session: You sit in a chamber while the pressure is gradually increased. You breathe nearly 100% oxygen through a hood or mask, usually for 60–90 minutes with short “air breaks.”
The course: Most research protocols use 40 sessions, five days per week, at 2.0 ATA for 90 minutes. Some extend to 60 sessions.
After the session: Most people return to normal activities right away. You are advised how to equalize ear pressure and what symptoms to report.
Who Might Consider HBOT After Stroke?
HBOT may be of interest to some survivors in the chronic phase of stroke who have completed standard rehabilitation and understand that the therapy is experimental. It is best approached with realistic goals, such as modest improvements in cognition, fatigue, or daily function, rather than expectations of dramatic recovery.
Whenever possible, participation in a well-designed clinical trial is the safest and most informative way to pursue HBOT.
Coverage and Cost
Medicare and most commercial insurers do not cover HBOT for stroke. Sessions are typically self-pay.
In the U.S., costs generally range from $250 to $600 per session, and Medicare data estimate about $596 per sessionwhen all fees are included. A 40-session course can therefore cost between $10,000 and $24,000.
Because stroke is not an FDA-approved indication, insurance does not cover HBOT. Some clinics exploit this by charging high fees for unproven treatments, which can create significant financial strain for families.
Questions to Ask Before Starting
What is the goal of HBOT in my case, and how will success be measured?
Is there a clinical trial I can join instead of paying out of pocket?
How many sessions are recommended, and at what pressure and duration?
What safety measures are in place to reduce risks?
What is the total cost, including facility and physician fees?
The Bottom Line
Hyperbaric oxygen therapy is an established treatment for several conditions, but stroke is not currently one of them. In acute ischemic stroke, it has no proven benefit except in air embolism. In chronic stroke, early studies suggested possible improvements, but a recent randomized controlled trial (Harrison et al., 2024)
provided stronger evidence that HBOT does not confer a meaningful benefit.
Dom’s story shows how HBOT can feel meaningful for some survivors, but research still needs to catch up. If you are considering HBOT, involve your stroke team, examine safety and costs carefully, and prioritize participation in a well-designed clinical trial. Be especially cautious of clinics that advertise HBOT as a guaranteed cure, since this is not supported by science.
We would also love to hear from you. If you’ve tried HBOT after stroke, please share your experience with us so that other survivors and caregivers can learn from your journey.
Disclaimer
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your physician, rehabilitation specialist, or another qualified healthcare provider before starting hyperbaric oxygen therapy or any new treatment after stroke. Never ignore or delay medical advice because of something you have read here.
Comments