Whether you’re exploring new options for wound healing, recovery, or overall wellness, the idea of sitting in a pressurized oxygen chamber might feel a bit unfamiliar — maybe even intimidating. But don’t worry. Your first hyperbaric oxygen therapy (HBOT) session is likely to be more comfortable and straightforward than you expect.

This guide breaks down what you’ll experience from the moment you arrive to the moment you leave, so you can walk into your appointment feeling informed and confident.

Before Your Session

Screening and Preparation
Most clinics will begin with a short medical evaluation to ensure HBOT is right for you. You’ll be asked about any recent illnesses, medications, or implanted medical devices. If you’re cleared to proceed, you’ll change into 100% cotton clothing provided by the clinic (no synthetic fabrics allowed due to safety protocols inside the chamber).

Quick tip: Avoid wearing perfume, lotion, or makeup, as many products aren’t allowed in the chamber environment.

Entering the Chamber

There are two common types of HBOT chambers: monoplace chambers, which hold one person, and multiplace chambers, which accommodate several patients at once. Regardless of the type, you’ll be able to lie down and relax during the session — some clinics even allow you to watch a movie or listen to music through built-in systems.

As the session begins, the chamber will slowly pressurize. This part takes about 10–15 minutes and feels similar to the pressure changes you experience during an airplane takeoff.

During the Session

Once the chamber reaches the target pressure, you’ll breathe pure oxygen for around 60 to 90 minutes. Most people feel relaxed and may even doze off. You might experience a slight warmth or fullness in your ears (like going underwater), which can be relieved by yawning or swallowing.

Clinicians monitor you throughout to ensure you’re comfortable and safe.

After the Session

Once your session ends, the chamber is slowly depressurized. Afterward, you can typically resume your day as usual — there’s no recovery period required. Some patients feel energized, while others might feel a little tired, especially after their first session.

For many treatment plans, multiple sessions are needed. Your provider will give you a customized schedule based on your health goals.

A Final Thought

Trying something new always comes with questions, and that’s a good thing — especially when it comes to your health. Hyperbaric chamber therapy is safe, non-invasive, and increasingly used for a wide range of conditions, from chronic wounds to post-concussion recovery. Understanding what to expect is the first step toward a smooth, empowering experience.

If you’re curious whether HBOT could be right for you, talk with a provider trained in this specialized treatment — and bring all your questions. You deserve to be informed every step of the way.