What is hyperbaric oxygen therapy and how can it help PTSD?

What is hyperbaric oxygen therapy and how can it help PTSD?

Hyperbaric oxygen therapy (HBOT) involves breathing in pure oxygen in a pressurized chamber, to increase the amount of oxygen circulating in the blood. It works in a similar way to the pressurized diving bells used by deep-sea divers to treat decompression sickness (the ‘bends’), which occurs when they resurface too quickly.

With a history dating back as far as the 19th century, HBOT is now used to help with symptoms of multiple sclerosis, skin grafts and burns, carbon monoxide poisoning, the side effects of radiotherapy, and several other conditions. One emerging area of interest is the use of HBOT as a potential treatment for the symptoms of PTSD. So, how does it work?

What is hyperbaric oxygen therapy?

During therapy, patients sit in a hyperbaric oxygen chamber that’s pressurised at up to 3 times normal air pressure. Normally, we breathe are that’s made up of around 21% oxygen. HBOT makes it possible to breathe in 100% oxygen, so more oxygen can enter the bloodstream. In doing so, HBOT helps improve blood supply to speed up the healing process, boost healthy blood vessels to carry nutrients around the body, kill bacteria and fight infection.

Could hyperbaric oxygen therapy help your PTSD?

Recent studies suggest that HBOT could be an effective treatment for PTSD, especially where other conventional treatments (such as medication or psychotherapy) haven’t worked so well. The research suggests that experiencing a traumatic event can cause physical changes in the brain. HBOT is thought to help increase neuroplasticity (the ability to form new connections) in the brain and help heal this physical damage.

One study of military personnel with PTSD found that regular HBOT treatment over a 4-week period led to a significant reduction in symptoms: after HBOT, 52% no longer met the threshold criteria for a PTSD diagnosis. Anxiety and depression improved, while many were able to reduce psychoactive medications. These improvements seemed to continue for months after the treatment.

However, other studies have had more mixed results, suggesting that while HBOT may not be a primary treatment for PTSD, it could be a helpful alternative or additional therapy to ease particularly stubborn symptoms.

What happens during HBOT?

HBOT can be delivered in individuals chambers or in a larger room that fits a few people at once. Treatment happens in three phases:

  • Compression phase: at the start of the session, you will lie on a table and breathe in oxygen through a mask, while the pressure in the chamber slowly increases.
  • Treatment phase: once the pressure is at the right level, you’ll be asked to put your mask on so you can breathe in the pure oxygen. You can read, watch TV or listen to music during this phase, which can last up to a couple of hours.
  • Decompression phase: once treatment is over, the pressure in the chamber will slowly start to drop back down to normal, and then you can leave.

HBOT must always take place under a doctor’s supervision. They will explain what to expect, how to take breaks, and how to pop your ears to ease pressure.

It’s usually carried out in a few sessions over a period of weeks.

Are there any risks to HBOT?

HBOT is generally very safe, but isn’t suitable for everyone. It’s not recommended for anyone who has lung problems, a cold or fever, or ear injuries, or who may feel claustrophobic or uncomfortable in a small space.

Some people may feel tired or lightheaded after HBOT. Severe side effects are uncommon, but might include lung damage, ear and sinus problems, vision issues, or oxygen poisoning. Your doctor will make sure the oxygen dose and length of treatment is tailored specifically to your needs, to minimize the likelihood of side effects.

Where to find Hyperbaric Oxygen Therapy

While HBOT is available through the NHS for some medical conditions, it’s not yet routinely commissioned for PTSD. If you’re curious about whether HBOT could help with your symptoms, speak to your doctor, who may be able to refer you to a private provider.

You can also find out more information about HBOT through the Hyperbaric Oxygen Treatment Trust and the British Hyperbaric Association.

It’s important to note, that while choosing your PTSD recovery path you need to address both the symptoms and the underlying condition. NICE guidance updated in 2018 recommends the use of trauma focused psychological treatments for Post Traumatic Stress Disorder in adults, specifically the use of Eye Movement Desensitisation Reprocessing (EMDR) and trauma focused cognitive behavioural therapy (CBT).

Please remember, these aren’t meant to be medical recommendations, but they’re tactics that have worked for others and might work for you, too. Be sure to work with a professional to find the best methods for you.

Hello! Did you find this information useful?

Please consider supporting PTSD UK with a donation to enable us to provide more information & resources to help us to support everyone affected by PTSD, no matter the trauma that caused it


You’ll find up-to-date news, research and information here along with some great tips to ease your PTSD in our blog.

Blue Light Symphony Orchestra

Blue Light Symphony Orchestra The Blue Light Symphony Orchestra is a UK charity with the aim to encourage music making at a local level within the UK emergency services and also make music therapy available to those in the emergency

Read More »

Writing and PTSD Guest Blog

Guest Blog: How writing is helping me to cope with PTSD Many people with Post Traumatic Stress Disorder find that writing can help them to understand their PTSD or C-PTSD and the symptoms they are experiencing – whether that be

Read More »


Asking directly about suicidal thoughts can help save lives To mark World Suicide Prevention Day on the 10th of September, our charity partner Samaritans is encouraging people not to be afraid to talk about suicidal thoughts and feelings if they are

Read More »

Grief famous person

How the death of someone famous can affect PTSD symptoms We are deeply saddened by the death of Her Majesty, Queen Elizabeth II. An inspiration to our country, her 70 years of dedication and service have shown her incredible strength

Read More »

Katie Price Trauma & Me

Katie Price: Trauma & Me TV appearance with PTSD UK This Thursday, 8th September, PTSD UK Founder and CEO Jacqui features in a documentary on Channel 4 about media personality Katie Price, where Katie explores her mental health and diagnosis

Read More »

Treatments for PTSD

It is possible for PTSD to be successfully treated many years after the traumatic event occurred, which means it is never too late to seek help. For some, the first step may be watchful waiting, then exploring therapeutic options such as individual or group therapy – but the main treatment options in the UK are psychological treatments such as Eye Movement Desensitisation Reprogramming (EMDR) and Cognitive Behavioural Therapy (CBT).

Traumatic events can be very difficult to come to terms with, but confronting and understanding your feelings and seeking professional help is often the only way of effectively treating PTSD. You can find out more in the links below, or here.