What to Expect During Your First HBOT Session: A Patient’s Guide

Walking into a hyperbaric oxygen chamber for the first time can feel like stepping into the unknown. Will it be comfortable? How long does it take? What will you feel during the session? At HBOT Chicago, we understand that curiosity often comes with a touch of apprehension, which is why knowing what to expect can make the first experience far more reassuring.

Hyperbaric Oxygen Therapy (HBOT) has been used for decades in both clinical and wellness settings. From supporting recovery after injuries to helping optimize energy and focus, HBOT sessions are increasingly sought by people who want to improve their health in a safe and non-invasive way. If you’re preparing for your first appointment, this guide walks you through every step of the process so you can feel confident and at ease.

The Basics: What HBOT Actually Is

Hyperbaric Oxygen Therapy involves breathing 100% oxygen in a pressurized chamber. Under pressure, oxygen dissolves more effectively into the bloodstream, plasma, and even cerebrospinal fluid. This allows it to reach tissues that may not receive optimal circulation under normal conditions.

For patients, the key takeaway is simple: more oxygen equals more support for energy production, repair processes, and overall vitality. While the science is fascinating, what most people want to know is what the actual session feels like.

Before the Appointment: Preparation Made Simple

One of the most common questions is: Do I need to prepare for HBOT? The answer is yes, but preparation is simple. At HBOT Chicago, patients are asked to:

Wear comfortable clothing: Cotton is best. Avoid perfumes, hair products, or lotions before entering the chamber.
Eat a light meal: Being overly hungry or overly full can cause mild discomfort.
Avoid alcohol or carbonated drinks: These can increase the chance of feeling bloated in the chamber.
Bring entertainment if desired: Some people like to listen to music, podcasts, or simply rest.

Staff will walk you through each step, so there’s no guesswork.

Meeting the Team and Initial Safety Check

When you arrive for your first session, you’ll be greeted by trained staff who will explain the process and answer questions. They’ll review your medical history, check vital signs, and ensure you’re comfortable with the session ahead.

Safety is a top priority. The staff will ask about recent illnesses, ear issues, or congestion, since these can influence your comfort inside the pressurized environment. Think of it as similar to preparing for air travel, where pressure changes can affect the ears.

Entering the Chamber

HBOT chambers come in two main types:

Monoplace chambers – single-person, clear acrylic tubes where you lie comfortably.
Multiplace chambers – larger, room-like spaces that can hold multiple people at once.

At HBOT Chicago, both styles are used depending on patient needs. The chamber is equipped with comfortable padding, communication devices, and, in many cases, entertainment options.

The Pressurization Phase: What It Feels Like

Once inside, the session begins with pressurization. This is when the chamber is slowly filled with oxygen under pressure. Patients typically notice a mild change in ear pressure, similar to taking off or landing in an airplane. Staff will guide you on how to equalize ear pressure using yawning, swallowing, or gently pinching the nose while blowing.

Most people adjust within minutes, and the sensation becomes unnoticeable as the pressure stabilizes.

Breathing Pure Oxygen: Relaxation Mode

After the chamber reaches the prescribed pressure, the main session begins. You’ll simply breathe normally while resting. There’s no effort required.

Some patients use the time to nap, meditate, or catch up on a podcast. Others describe the experience as a rare opportunity for complete stillness in a busy world. The oxygen itself has no smell or taste—you’ll simply notice that your breathing feels natural and effortless.

Duration of the Session

A typical HBOT session lasts between 60 to 90 minutes. The length depends on the goal of therapy and individual needs. For new patients, staff remain in close communication throughout the session, checking comfort levels and answering questions via intercom.

The Depressurization Phase: Returning to Normal

At the end of the session, the chamber pressure is gradually reduced. Just as during the beginning, you may notice ear pressure changes, but this is easily managed with swallowing or yawning. The process is slow to ensure comfort and safety.

Most patients describe the end of the session as smooth and uneventful.

After the Session: How You Might Feel

One of the best parts about HBOT is that there’s no downtime. You can return to work, exercise, or daily activities right away.

Patients often report feeling:

More relaxed and refreshed
Mildly energized, like after a restorative nap
Clearer in focus and mood

Some may feel slightly tired, which is usually a sign of the body beginning its restorative work.

Frequency and Follow-Up Sessions

While a single HBOT session can be beneficial, many people choose to undergo a series of sessions for cumulative results. At HBOT Chicago, staff will create a personalized plan based on health history and goals.

For example:

Wellness seekers may schedule sessions 1–2 times per week.
Recovery support may involve more frequent sessions over several weeks.

Consistency often enhances the benefits of HBOT.

Safety and Comfort: Addressing Common Concerns

It’s natural to feel nervous before the first session. Here are answers to some of the most common concerns:

Is it claustrophobic? Chambers are designed with clear walls or spacious interiors. Staff remain in communication the entire time.
Can I bring electronics? Safety rules typically prohibit devices inside, but entertainment may be provided.
Is HBOT safe? Yes. HBOT has been used for decades with well-documented safety protocols. Side effects are rare and usually mild, such as temporary ear fullness.

Patient Stories: Real Experiences

Hearing from others can ease uncertainty. Many first-time patients report similar takeaways:

The process was far more comfortable than expected.
The time passed quickly, often spent resting or napping.
They felt relaxed, refreshed, or mentally sharper afterward.

While experiences vary, the overall theme is that the first session removes uncertainty and builds confidence for future visits.

Maximizing Your First HBOT Experience

To get the most out of your first session, consider:

Staying hydrated before and after.
Practicing relaxation techniques if you feel nervous.
Being consistent with follow-up sessions for lasting results.
Communicating with staff about comfort at all times.

The more at ease you are, the more rewarding the session will feel.

Looking Ahead: HBOT as Part of Wellness Care

As research into oxygen-based therapies expands, HBOT continues to gain recognition not only for medical applications but also for wellness and longevity. Your first session is simply the beginning of understanding how enhanced oxygenation can support energy, clarity, and overall balance.

At HBOT Chicago, the goal is to make every patient’s first session a positive, comfortable, and empowering experience—one that helps pave the way for long-term wellness strategies.

Key Takeaways

HBOT involves breathing pure oxygen in a pressurized chamber, allowing oxygen to reach deeper tissues.
First sessions are simple: prepare with light clothing, relax during the process, and resume daily life afterward.
The experience is often compared to air travel in terms of ear pressure changes.
Sessions last 60–90 minutes and are designed to be comfortable and restorative.
Many patients leave feeling relaxed, refreshed, or more mentally alert.

Your first HBOT session at HBOT Chicago is more than just an introduction to a therapy—it’s the start of a journey toward greater vitality and resilience.

For more information about HBOT, call (312) 767-3500 or find an Oxygen therapy clinic near you.

Sources

Sunday	Closed
Monday	10am-7pm
Tuesday	7am-7pm
Wednesday	CLOSED
Thursday	7am-7pm
Friday	8am-2pm
Saturday	CLOSED