Why Some Patients Don’t Tolerate HBOT Well (And How to Adjust)

Is it possible to feel worse after starting hyperbaric oxygen therapy? It’s a question that comes up more often than you might think. While most people tolerate hyperbaric sessions well, there are cases where patients feel off, uncomfortable, or even worse after their first few sessions.

At HBOTUSA, the focus is on helping both patients and practitioners understand why this happens and how to respond appropriately. Because when someone doesn’t tolerate HBOT well, the answer is rarely to stop entirely. More often, it’s about adjusting the approach.

Understanding what’s happening beneath the surface can make the difference between frustration and forward progress.

Can HBOT Make You Feel Worse at First

It’s not common, but it does happen. Some patients report symptoms like fatigue, headaches, brain fog, or a general sense that something isn’t quite right after initial sessions.

This can feel confusing. After all, HBOT is designed to support the body by increasing oxygen availability under pressure. So why would someone feel worse instead of better?

The key lies in how different bodies respond to changes in oxygen levels, pressure, and overall physiological demand.

Not all patients start from the same baseline. And that baseline plays a major role in how they tolerate hyperbaric therapy.

The Three Common Patient Categories

When a patient doesn’t tolerate HBOT well, it often falls into one of three broad categories. Identifying which category someone fits into can help guide adjustments and improve their experience.

1. The Sensitive or Reactive Patient

Some individuals are simply more sensitive to change. Their systems tend to react quickly and sometimes intensely to new inputs, whether it’s a supplement, a dietary shift, or a therapy like HBOT.

When exposed to increased oxygen levels and pressure, their body may respond in a way that feels overwhelming rather than supportive.

These patients might report symptoms early, sometimes even after their first session.

For this group, less is often more. Starting at lower pressures, shorter durations, and reduced frequency can make a significant difference. Giving the body time to adapt gradually allows for a smoother experience.

2. The Overloaded or Stressed System

Another common category includes patients whose systems are already under significant stress. This could be due to lifestyle factors, ongoing health challenges, or cumulative physiological load.

When HBOT is introduced, it adds another layer of demand. Even though the therapy is intended to support the body, it still requires the system to respond and adapt.

If the baseline level of stress is already high, that additional demand can push the system beyond its current capacity.

These patients may benefit from addressing foundational factors first. Sleep, nutrition, hydration, and stress management play a crucial role in how well someone tolerates any therapy.

Adjusting HBOT parameters while also supporting these basics can improve tolerance significantly.

3. The Patient Experiencing Oxidative Imbalance

HBOT involves increased oxygen exposure, which naturally interacts with processes related to oxidation in the body. While this can be beneficial when balanced, some patients may already be dealing with an imbalance.

When oxygen levels increase, it can temporarily amplify certain responses, leading to symptoms that feel uncomfortable.

This doesn’t mean HBOT is inappropriate. It means the approach may need to be more strategic.

Monitoring how the patient responds and adjusting intensity, duration, and frequency can help create a more balanced experience over time.

Why Starting Slow Matters

One of the most important principles in HBOT is progression. Starting with aggressive protocols may seem appealing, especially when the goal is to see results quickly, but it can backfire in sensitive or stressed patients.

A gradual approach allows the body to adapt step by step.

This includes:

• Lower initial pressure settings
• Shorter session durations
• Reduced frequency of sessions

As the patient begins to tolerate these levels well, adjustments can be made incrementally.

This method not only improves comfort but also builds confidence. Patients are more likely to stay consistent when they feel supported rather than overwhelmed.

The Role of Patient Expectations

How a patient perceives their experience can influence how they respond to it. If someone expects immediate, dramatic results, even mild discomfort can feel like something is wrong.

On the other hand, when expectations are set properly, patients are more likely to understand that initial adjustments are part of the process.

Clear communication before starting HBOT is essential.

Patients should know that:

• Everyone responds differently
• Some may need a slower progression
• Adjustments are normal and expected

This creates a sense of trust and reduces anxiety if symptoms arise.

Communication Is Everything

When a patient doesn’t tolerate HBOT well, communication becomes one of the most important tools available.

Practitioners need to create an environment where patients feel comfortable sharing their experiences honestly.

Small details matter. Changes in sleep, mood, energy, or physical sensations can all provide clues about how the body is responding.

By maintaining open dialogue, practitioners can make informed adjustments rather than guessing.

This collaborative approach helps keep patients engaged and prevents them from abandoning the process prematurely.

Adjusting the Protocol Effectively

When symptoms arise, the goal is not to push through aggressively. It’s to adjust intelligently.

This might involve:

• Reducing pressure levels temporarily
• Shortening session length
• Increasing rest days between sessions
• Monitoring responses more closely

In some cases, stepping back slightly can actually lead to better long-term progress.

The idea is to find the patient’s current tolerance level and work within it, gradually expanding that capacity over time.

The Importance of Individualization

No two patients are exactly alike. What works well for one person may not work for another.

This is why individualized protocols are so important in HBOT.

Rather than applying a one-size-fits-all approach, practitioners should consider factors such as:

• Overall health status
• Lifestyle habits
• Stress levels
• Previous responses to therapies

Tailoring the protocol to the individual increases the likelihood of a positive experience.

It also reinforces the idea that adjustments are not failures. They are part of the process.

Supporting the Body Outside the Chamber

HBOT does not exist in isolation. What a patient does outside the chamber has a significant impact on how they tolerate sessions.

Supporting the body through simple, consistent habits can make a noticeable difference.

Focus areas include:

• Getting adequate sleep
• Staying properly hydrated
• Maintaining balanced nutrition
• Managing daily stress

These factors create a stronger foundation, making it easier for the body to respond positively to HBOT.

Staying Patient With the Process

When progress doesn’t happen as quickly as expected, it can be tempting to abandon the approach or push harder.

Neither of these extremes is ideal.

Patience plays a critical role in long-term success. Allowing the body time to adapt, especially when starting slowly, often leads to more sustainable outcomes.

Progress may not always be linear, but consistency with a well-adjusted plan tends to produce better results over time.

Building Trust Through the Experience

When patients feel heard, supported, and guided through adjustments, it builds trust. That trust is essential for maintaining consistency and engagement.

Experiencing initial discomfort doesn’t have to be a negative turning point. With the right approach, it can become an opportunity to refine the protocol and better understand the patient’s needs.

This perspective shifts the focus from frustration to problem-solving.

Continuing Education for Practitioners

For those working with HBOT regularly, ongoing education is key to improving outcomes.

Resources like the free safety and compliance checklist available here: https://www.thehbotcourse.com/courses can help practitioners refine their approach and ensure they are operating within best practices.

There are also additional educational materials available, including foundational courses, eBooks, and in-depth resources that explore the principles behind hyperbaric therapy.

Staying informed allows practitioners to make better decisions and adapt more effectively when challenges arise.

Final Thoughts

Not every patient will respond to HBOT in the same way, and that’s completely normal.

When someone doesn’t tolerate their initial sessions well, it doesn’t mean the therapy isn’t appropriate. It usually means the approach needs to be adjusted.

By identifying the type of patient you’re working with, starting slowly, maintaining clear communication, and focusing on individualized care, you can create a more positive and sustainable experience.

HBOT is a tool, and like any tool, its effectiveness depends on how it’s used.

DISCLAIMER: Dr. Sonners does not diagnose, treat, or prevent any medical conditions online. The information provided here is for educational purposes only and is not a substitute for professional medical advice. Always work with your healthcare provider to monitor your health and any therapies you are using.

These posts and videos are not designed to and do not provide medical advice, diagnosis, or services to you or any other individual.

If you’re interested in a more personalized approach, you can set up a consultation by contacting support@hbotusa.com.