Move & Recover
Hyperbaric Oxygen Therapy UK: NHS Uses vs Wellness Claims, and Is a Home Chamber Safe?
Quick answer
Hyperbaric oxygen therapy (breathing pure oxygen in a pressurised chamber) has proven medical uses: NHS England routinely funds it for decompression illness and gas embolism. Evidence for anti-ageing, long COVID, autism or sports recovery is weak or negative. Soft-shell home chambers run at low pressure and carry fire and ear-injury risks.
What is hyperbaric oxygen therapy?
Hyperbaric oxygen therapy (HBOT) means breathing close to 100% oxygen while sitting or lying in a chamber pressurised above normal air pressure. In hospital units, pressure is usually two to three times sea level. This forces more oxygen into the blood and can shrink gas bubbles, which is why it treats divers with "the bends".
Two very different things are sold under the same name:
- Medical (hard-shell) HBOT: steel or acrylic chambers run by trained staff at high pressure with pure oxygen.
- "Mild" or soft-shell chambers: inflatable fabric bags, often run at about 1.3 times atmospheric pressure (3 to 5 psi), sometimes with an oxygen concentrator. These are what most wellness clinics and home-chamber sellers offer.
What does the NHS use it for?
NHS England routinely commissions HBOT for two conditions only: decompression illness (mostly from diving, around 150 to 200 cases a year) and gas embolism (gas bubbles in the blood, often after a medical procedure), according to its 2024 consultation on hyperbaric services. Eight centres run by independent providers deliver it, and NHS England states it does not routinely commission HBOT for other conditions.
For diabetic foot ulcers, NICE guideline NG19 says not to offer hyperbaric oxygen therapy except as part of a clinical trial. A Cochrane review found HBOT improved diabetic ulcer healing in the short term but not the long term, with trial flaws that limit confidence.
What do wellness clinics claim?
Private clinics and home-chamber sellers promote HBOT for:
- anti-ageing and longer telomeres (the protective caps on chromosomes)
- brain fog, memory and focus
- long COVID
- faster sports recovery
- autism, and many other conditions
What does the evidence show?
| Claim | Evidence grade | Best evidence |
|---|---|---|
| Decompression illness and gas embolism | Strong | NHS England commissioning |
| Diabetic foot ulcers | Mixed research | Cochrane, Kranke 2015; NICE NG19 |
| Anti-ageing (telomeres, senescent cells) | Early | Hachmo 2020 (35 people, no control group, industry-linked) |
| Brain and physical performance in older adults | Early | Mohammadi 2026 systematic review |
| Long COVID | Early (best trial negative) | D'hoore 2025 randomised placebo-controlled trial |
| Autism | None (evidence against) | Cochrane, Xiong 2016 |
Anti-ageing: a headline built on a small study
The much-shared "HBOT reverses ageing" claim comes from a 2020 Israeli study of 35 healthy over-64s given 60 sessions in a hard-shell medical chamber. Telomere length in some blood cells rose. There was no control group, the outcome was a lab marker rather than health or lifespan, and several authors work for, or hold shares in, a company selling HBOT programmes. It does not apply to soft-shell chambers, which run at far lower pressure.
Long COVID: the best trial found no difference
A 2025 randomised, placebo-controlled trial found no significant differences in symptoms, function or cognitive tests between hyperbaric oxygen, normal-pressure oxygen and placebo. Some people in every group felt better, which suggests a placebo effect. The authors warned against promoting HBOT for long COVID until better evidence exists.
Older adults: early and mixed
A 2026 systematic review suggested HBOT may improve cognitive scores in older adults, but called the findings preliminary, with few studies, varied protocols, moderate quality and short follow-up.
Medical and wellness HBOT compared
| Hospital (hard-shell) HBOT | Soft-shell "mild" chamber | |
|---|---|---|
| Typical pressure | About 2 to 3 times sea level | About 1.3 times sea level (3 to 5 psi) |
| Gas breathed | Close to 100% oxygen | Air, or air plus an oxygen concentrator |
| Who runs it | Trained hyperbaric teams, usually medically supervised | Clinics, gyms, spas or home owners |
| Main uses with evidence | Decompression illness, gas embolism, selected wounds | None well established |
| Key risks | Ear and lung barotrauma, oxygen toxicity, fire | Barotrauma, fire, suffocation, misleading claims (Murray 2026) |
Much of the research quoted in wellness marketing, including the telomere study, used hard-shell chambers at high pressure, not the soft chambers many clinics and home sellers offer. Results from one cannot simply be applied to the other.
Who should be careful?
- Ear and sinus problems, colds: pressure changes can cause ear barotrauma (pressure injury to the ear), the most common side effect, also seen in the autism trial.
- Lung disease, especially a history of collapsed lung, and some heart conditions.
- Claustrophobia, pregnancy, seizure disorders, and some medicines: discuss with your GP.
- Children: be very wary of clinics offering HBOT for autism or developmental conditions.
Are soft-shell home chambers safe?
They carry real risks without proven benefits. A 2026 review in Undersea and Hyperbaric Medicine found soft-sided and "mild" chambers are often marketed with misleading claims and do not meet key safety codes and pressure-vessel standards, with reported harms including ear and lung barotrauma, suffocation, fire, structural failure and, rarely, death. A second 2026 review notes both mild and traditional HBOT carry potentially life-threatening fire and explosion risks if safety standards are not followed. Oxygen-enriched air makes fires start and spread far more easily, so phones, hand warmers, hair products and static all become hazards.
Why do people feel better after sessions?
Many people do report feeling calmer or more energetic after HBOT, and that experience is real. But the long COVID trial showed the same improvements in people who unknowingly received placebo. Lying quietly for an hour, expecting to feel better and paying for a course of treatment all shape how we feel. That is why randomised, placebo-controlled trials matter more than testimonials.
If you are considering HBOT: what to look for
- Ask your GP or specialist first whether there is an evidence-based reason for you.
- Check the provider: ask whether a doctor oversees treatment, what pressure is used, and whether staff are trained in hyperbaric medicine. The British Hyperbaric Association lists UK facilities.
- Get the fire-safety rules in writing and follow them.
- Be wary of packages of 20 to 60 sessions sold for anti-ageing, brain health or long COVID.
- Do not buy a home chamber for wellness purposes; we do not recommend any.
Bottom line
Hyperbaric oxygen is real medicine for a short list of emergencies and some specialist wound care. For anti-ageing, long COVID, autism and recovery, the best evidence is weak or negative, and home soft-shell chambers add fire and pressure risks. If you want to spend money on longevity, strength training and daily walking have far stronger evidence.
Frequently asked questions
Does the NHS offer hyperbaric oxygen therapy?
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Yes, but only for a short list of conditions. NHS England routinely commissions it for decompression illness, usually from diving, and gas embolism, through a small number of specialist centres. It does not routinely fund HBOT for other conditions. NICE advises against using it for diabetic foot ulcers outside a clinical trial.
Does hyperbaric oxygen therapy slow ageing?
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There is no good evidence it does. The widely shared claim comes from a 2020 study of 35 older adults in a medical chamber that found longer telomeres in some blood cells. It had no control group, measured a lab marker rather than health, and several authors had commercial links to an HBOT provider.
Does hyperbaric oxygen help long COVID?
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The best evidence so far says probably not. A 2025 randomised placebo-controlled trial found no significant difference in symptoms, function or cognitive scores between hyperbaric oxygen, normal oxygen and placebo. People in all groups reported feeling better, pointing to a placebo effect. The authors advised against promoting HBOT for long COVID.
Are home hyperbaric chambers safe?
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They carry real risks. Soft-shell chambers often run at low pressure, do not meet key pressure-vessel and fire safety standards, and are marketed with claims that outrun the evidence. Reported harms include ear and lung pressure injuries, suffocation and fires. Oxygen-rich air makes fires start and spread easily. We do not recommend them for wellness use.
What are the side effects of hyperbaric oxygen therapy?
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The most common is ear pain or ear barotrauma from pressure changes. Others include sinus pain, temporary short-sightedness, tiredness and, rarely, seizures from oxygen toxicity or lung injury. Fire is a rare but serious hazard in any oxygen-rich chamber. People with lung disease, ear problems or claustrophobia should get medical advice first.
How much does a hyperbaric chamber session cost in the UK?
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Private clinic prices vary widely and are often sold in packages of 10 to 60 sessions, which can add up to thousands of pounds. Before paying, ask what pressure is used, who supervises, and what evidence supports HBOT for your specific goal. For most wellness goals, that evidence is weak.
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