Hyperbaric oxygen therapy (HBOT) is not currently part of standard clinical guidelines for autism spectrum disorder (ASD). Yet a growing number of families are asking about it — and some randomised controlled trials and parent-reported outcomes offer signals worth understanding clearly.
This article sets out what the research currently shows, what HBOT can and cannot offer, and how some families are including it as one layer in a broader, multimodal wellbeing approach.
Why Families Are Exploring HBOT for Autism
Autism spectrum disorder is complex and heterogeneous. There is no single cause, pathway, or universally effective intervention. Researchers have identified certain physiological patterns in some children with ASD that have informed interest in HBOT as a supportive option:
- Differences in cerebral blood flow
- Markers of neuroinflammation
- Oxidative stress imbalance
The underlying rationale is straightforward: by increasing oxygen availability and supporting the body's physiological balance, it may be possible to support certain aspects of brain function and behaviour. HBOT is explored within this framework as a supportive, non-invasive adjunct — not as a primary intervention or a substitute for established therapies.
What the Research Currently Shows
Positive Signals from Clinical Studies
The most cited research includes a randomised controlled trial in which children received mild HBOT (approximately 1.3 ATA with slightly enriched oxygen) over multiple sessions across several weeks. Improvements were reported across several domains:
- Social interaction
- Communication
- Eye contact
- Overall adaptive functioning
Additional smaller studies and clinical observations have reported:
- Reduced systemic inflammation markers
- Improved physiological balance
- Positive behavioural outcomes in a subset of participants
Across these studies, mild HBOT was generally well tolerated. The most commonly reported side effect was mild, temporary ear pressure during pressurisation — similar to the sensation experienced during air travel.
Variability in Outcomes
Not every child responds in the same way. Some families report meaningful improvements; others observe subtle changes; some see no discernible difference. This variability is consistent with the heterogeneous nature of autism itself. Results are individual and cannot be predicted in advance.
Why HBOT Is Not Part of Standard Clinical Guidelines
A reasonable question is: if positive studies exist, why is HBOT not recommended in UK clinical guidelines such as those published by NICE?
National healthcare guidelines require:
- Large-scale, consistent, and replicable high-quality evidence
- Predictable outcomes across broad patient populations
- Demonstrated cost-effectiveness within the healthcare system
The existing evidence base for HBOT in autism does not yet meet these thresholds. This does not mean the approach has no value — it means it has not yet reached the standard required for inclusion in publicly funded, standardised clinical protocols. Research in this area is ongoing.
Safety Profile
At mild pressures (1.3–1.5 ATA), HBOT has a well-established safety profile. It is considered low risk when sessions are delivered by trained practitioners following appropriate screening protocols.
Common experiences during or after sessions include:
- Ear pressure during pressurisation (similar to the sensation when flying)
- Temporary fatigue following sessions
- Occasional mild discomfort during initial sessions
Serious complications are rare. All prospective clients — including children — should undergo a thorough health assessment before beginning HBOT sessions. Parents and guardians should discuss suitability with both the HBOT provider and the child's existing medical team.
What HBOT Can and Cannot Offer
| What HBOT May Support | What HBOT Does Not Do |
|---|---|
| Increased oxygen availability in the body | Guarantee outcomes or resolve autism |
| Support for physiological balance | Replace established therapies (speech, behavioural, educational) |
| Potential improvements in behaviour or interaction in some children | Form part of standard NHS autism support |
| A low-risk, non-invasive supportive option | Produce uniform results across all children |
How Families Are Using HBOT Today
In private and wellness settings, HBOT is typically used as one component within a broader, integrated support approach rather than as a standalone therapy. Common complementary elements include:
- Nutritional assessment and targeted dietary support
- Behavioural therapies (e.g. ABA, EIBI)
- Speech and language therapy
- Sensory integration and developmental work
- Lifestyle and environmental adjustments
At Rebalance Wellbeing Hub CIC, mild HBOT protocols (1.4–1.5 ATA) are used with a focus on comfort, gradual exposure, and realistic expectations. HBOT is positioned as a supportive layer within a broader plan — never as the primary intervention.
Find out more about our Hyperbaric Oxygen Therapy service, including how sessions work, what to expect, and how to register your interest.
Frequently Asked Questions
Is HBOT safe for children with autism?
At mild pressures (1.3–1.5 ATA), HBOT is generally considered low risk and has been used in paediatric research studies. A thorough health assessment and discussion with the child's medical team is always recommended before starting.
How many sessions are typically used?
Research protocols have typically used 40 sessions over several weeks. However, session numbers vary by provider and individual circumstances. There is no universally agreed standard protocol for ASD at this time.
At what age can children start HBOT?
There is no fixed minimum age, but sessions require the child to remain calm in an enclosed space for a period of time. Suitability depends on the individual child's comfort level and temperament. This should be discussed with the provider before any session is booked.
Will my child feel uncomfortable during sessions?
The most commonly reported discomfort is mild ear pressure during pressurisation, which typically resolves quickly. Practitioners experienced in working with children take a gradual approach to acclimatisation.
Can HBOT replace speech therapy or behavioural support?
No. HBOT is positioned as a supportive adjunct — it is not a replacement for evidence-based approaches such as speech and language therapy or behavioural support programmes.
What is the key question to ask before starting?
The right question is not: "Will this fix everything?"
It is: "Could this safely support my child's wellbeing as part of a broader approach?"
For some families, the answer has been yes. For others, results have been modest or unclear. Any decision should be informed by realistic expectations, grounded in the available evidence, and always centred around the individual child's needs and existing support plan.
References
Granpeesheh, D. et al. (2010) 'Randomized controlled trial of hyperbaric oxygen therapy for children with autism', Research in Autism Spectrum Disorders, 4(2), pp. 268–275.
National Institute for Health and Care Excellence (NICE) (2013) Autism spectrum disorder in under 19s: support and management.
Rossignol, D.A. et al. (2007) 'Hyperbaric oxygen therapy in autism: oxidative stress, inflammation, and symptom changes', Journal of Autism and Developmental Disorders, 37(10), pp. 1917–1927.
Rossignol, D.A. et al. (2009) 'Hyperbaric treatment for children with autism: a multicenter, randomized, double-blind, controlled trial', BMC Pediatrics, 9, p. 21.
Rossignol, D.A. and Frye, R.E. (2012) 'Hyperbaric oxygen treatment in autism spectrum disorders', Medical Gas Research, 2(1), p. 16.
Sampanthavivat, M. et al. (2008) 'Hyperbaric oxygen therapy in autism', Journal of the Medical Association of Thailand, 91(8), pp. 1232–1238.
This article is for informational purposes only and does not constitute medical advice. Always consult your GP or your child's specialist before starting any new therapy.