Long COVID & Post-Viral Fatigue
Still Exhausted, Foggy or Breathless Months Later?
If fatigue, brain fog, breathlessness or other lingering symptoms are making it difficult to feel like yourself again, explore whether Hyperbaric Oxygen Therapy could form part of your approach to Long COVID recovery — personally guided, in our Kildare clinic or from your own home.
Does This Sound Familiar?
You're Not Alone — and You're Not Imagining It
For some people, recovery from COVID doesn't end when the initial infection passes. Weeks or months later, fatigue, brain fog, breathlessness and other symptoms can continue to affect work, exercise, family life and everyday activities.
The Science
How HBOT May Support Long COVID Recovery
Long COVID can affect multiple systems in the body and may involve persistent fatigue, brain fog, breathlessness, pain, sleep disruption and reduced physical capacity. The underlying biology is complex, with research exploring factors including inflammation, vascular changes, neurological effects and altered cellular function.
Hyperbaric Oxygen Therapy significantly increases the amount of oxygen dissolved in the blood plasma. Under pressure, this temporarily increases oxygen availability throughout the body, including to tissues with high metabolic demands such as the brain and muscles. This may influence several of the biological processes relevant to recovery from persistent post-viral symptoms.
May Support Cellular Energy
Oxygen is essential for mitochondrial production of ATP. Increasing oxygen availability may support cellular energy processes relevant to physical and mental fatigue.
May Support Cognitive Function
The brain has high oxygen and energy requirements. HBOT may support neurological metabolism and neuroplasticity — processes relevant to cognition, concentration and recovery from neurological symptoms.
May Influence Inflammation
Long COVID may involve persistent inflammatory and immune-system changes in some people. HBOT can influence inflammatory and oxidative pathways that may be relevant to these processes.
Supports Tissue Oxygenation & Recovery
HBOT substantially increases dissolved oxygen in the blood plasma, increasing oxygen availability to tissues during treatment and potentially supporting normal cellular repair and recovery processes.
The Research
What Does the Research Say?
HBOT has been studied as a potential treatment for Long COVID, including in randomised sham-controlled trials. Some studies have reported improvements in cognitive function, fatigue, sleep, pain and quality of life, while systematic reviews continue to highlight the relatively small evidence base and the need for larger, standardised trials. The results are encouraging in some areas, but HBOT should not yet be presented as a proven treatment for every person or every symptom associated with Long COVID.
2022 Randomised, Double-Blind, Sham-Controlled Trial · 73 Patients
Researchers randomised 73 people with ongoing post-COVID symptoms to either 40 HBOT sessions or sham treatment. Compared with the sham group, the HBOT group showed statistically significant improvements in global cognitive function, attention and executive function. Improvements were also reported in energy, sleep, psychological symptoms and pain interference.
Important limitation: This was a relatively small trial involving 73 participants, and follow-up immediately after treatment does not establish how broadly or consistently the results apply to people with different Long COVID symptoms.
View the Research on PubMed →2025 Systematic Review · 7 Studies · 199 Participants
Researchers reviewed seven studies from seven countries involving 199 people with Long COVID. The studies included both randomised and observational research and used between 10 and 60 HBOT sessions. Across the included studies, improvements were reported in areas including memory, executive function, attention, fatigue and pain.
Important limitation: Treatment protocols varied considerably and the total number of participants remained small. The authors concluded that larger randomised studies are needed to establish efficacy more confidently.
View the Research on PubMed →2024 Systematic Review · 10 Clinical Studies
This review identified 10 clinical studies examining HBOT for Long COVID, including three completed randomised controlled trials. Most included studies reported improvements in some areas such as quality of life, fatigue, cognition, neuropsychiatric symptoms or cardiopulmonary function.
Important limitation: The studies varied considerably in design and quality, and the researchers concluded that rigorous, larger-scale randomised trials are still needed to establish appropriate indications, protocols and longer-term outcomes.
View the Research on PubMed →What does this mean for Long COVID? Current research provides some encouraging evidence for HBOT in areas including cognition, fatigue, sleep and quality of life. However, Long COVID is complex and the evidence base remains relatively small. HBOT is therefore best considered as a potential adjunct rather than a guaranteed solution.
Longer-term follow-up: Researchers also followed 31 participants from the earlier HBOT study approximately one year after treatment and reported persistence of improvements across several measured quality-of-life and sleep outcomes. View the Long-Term Follow-Up on PubMed →
Your Guide
Your HBOT Programme, Guided by Davitt Meenaghan
Davitt is an IBUM-certified Hyperbaric Safety Officer. He founded ReWell after seeing too many people buying or renting chambers with little guidance on how to use them appropriately.
For people exploring HBOT following COVID or another viral illness, that guidance means considering your symptoms, health history, current level of function and what you're hoping to achieve. Davitt guides session frequency, pressure and pacing around the individual, with particular consideration for fatigue, symptom tolerance and how you're responding as you go.
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The Process
How Your ReWell Programme Works
From first call to first session — here's what to expect, whichever path you choose.
Discovery Call
Tell us about your symptoms, how long you've been experiencing them, your health history and what you've already tried. Davitt will talk through whether HBOT may be appropriate as part of your wider approach and recommend a starting point — clinic, rental or ownership.
Your Personalised Protocol
Based on your circumstances, symptoms and goals, ReWell guides your HBOT programme — including session frequency, pressure and pacing — rather than applying the same approach to everyone.
Clinic Visit or Home Delivery
Book your first clinic session in Kildare, or — for rentals — we deliver and install your chamber, with a full safety walkthrough so you feel confident from session one.
Ongoing Support
We check in throughout your programme — questions, adjustments, progress — so you're never figuring it out alone. Available by phone and WhatsApp.
Why ReWell
Why People Choose ReWell
There are other places to access HBOT in Ireland. Here's what makes the ReWell experience different.
Personally Guided
Led by Davitt Meenaghan, IBUM-certified Hyperbaric Safety Officer. Your HBOT programme is guided around your circumstances, goals and intended use.
Nationwide Access
Clinic sessions in Kildare, home rentals delivered and installed across all 32 counties, and flexible ownership options. Wherever you're based — we come to you.
Ongoing Support
We don't just deliver a chamber and disappear. From your first conversation through to ongoing use, the ReWell team remains available for guidance and support.
Common Questions
Frequently Asked Questions
Is there scientific evidence for HBOT in Long COVID?
Yes, HBOT has been studied specifically in people with Long COVID, including in randomised sham-controlled trials. Some studies have reported improvements in areas including cognition, fatigue, energy, sleep, pain and quality of life. However, the evidence base remains relatively small and further large-scale research is needed before HBOT can be considered an established treatment for Long COVID.
Can HBOT help with Long COVID fatigue and brain fog?
Fatigue and cognitive difficulties have been measured in Long COVID HBOT research. A randomised sham-controlled trial reported improvements in energy and several areas of cognitive function following HBOT, and systematic reviews have identified similar positive findings across some studies. However, individual responses vary and improvement cannot be guaranteed.
Are the effects of HBOT for Long COVID long-lasting?
Long-term evidence remains limited. One follow-up study involving 31 participants from an earlier HBOT trial reported that improvements across several quality-of-life and sleep measures were still present approximately one year after treatment. This is encouraging, but larger independent studies are needed to understand how consistently benefits persist.
How many HBOT sessions are needed for Long COVID?
There is no universally established HBOT programme for Long COVID. Published studies have used different treatment protocols and numbers of sessions, so research protocols shouldn't automatically be treated as a prescription for every individual. ReWell guides frequency, pressure and pacing around your circumstances and intended use.
Is HBOT safe for people with Long COVID?
HBOT is generally well tolerated, but it isn't suitable for everyone. Possible side effects include pressure-related ear or sinus discomfort, temporary vision changes and other less common complications. Long COVID can also involve different organ systems and medical issues, so health history and suitability should be considered before starting HBOT.
Can I use HBOT at home?
ReWell offers both clinic sessions in Kildare and chamber rental for use at home. Which option is most appropriate depends on your circumstances, how regularly you intend to use HBOT and whether home use is suitable for you. ReWell provides delivery, installation, training and ongoing guidance for home rentals.
Conditions & Research
Explore HBOT by Area of Interest
Explore the research behind HBOT and learn how it may support different areas of health, recovery and performance.
What Clients Are Saying
Real experiences from people who have used ReWell for clinic sessions, home HBOT rental and ongoing support.
Not Sure Where to Start?
Ready to Explore HBOT for Long COVID Recovery?
Speak directly with Davitt Meenaghan about the symptoms you're experiencing and what you're hoping to achieve. We'll help you understand whether HBOT may have a place in your wider approach and which pathway may suit you best — clinic sessions, home rental or chamber ownership. No pressure, no obligation. Just an honest conversation.