If you’re considering hyperbaric oxygen therapy (HBOT) for the first time, it’s natural to wonder what the experience will actually feel like. While HBOT is a well-established medical therapy with over 100 years of clinical use, the idea of entering a pressurized chamber can feel unfamiliar to many. In this post, we’ll walk through what to expect during an HBOT session and how it feels from start to finish, so you can feel confident and prepared.
Step 1: Medical Intake and Screening
Before your first session, you’ll complete a health intake and screening process. This will include a review of your medical history, recent imaging or labs (if applicable), and a physical assessment to ensure HBOT is appropriate and safe for you.
At MD Hyperbaric, this is supervised by a qualified medical provider, often a physician or nurse practitioner trained in hyperbaric medicine.
Step 2: Preparation for the Session
Once cleared, you’ll be guided to change into clinic-provided cotton clothing, which reduces static electricity and improves safety in the chamber. Personal items like electronics, watches, and lotions are typically not allowed inside the chamber.
You’ll also be asked to remove jewelry and use the restroom prior to beginning your session. Be sure to bring a book or other reading materials, or you may select one from our library!
Step 3: Entering the Chamber
Most HBOT sessions take place in either a monoplace (single-person) or multiplace (multi-person) chamber. At MD Hyperbaric, patients lie down or sit up in a spacious, FDA-cleared hard-sided monoplace chamber. You can see out at all times and continuously communicate with our trained staff via a communication device. Once inside, the door is sealed, and the chamber begins to pressurize with filtered room air.
You’ll hear a soft hissing sound as air enters, and you’ll feel a change in pressure similar to takeoff in an airplane. Your ears may pop or feel full, and your technician will walk you through how to equalize the pressure by yawning, swallowing, or gently pinching your nose and blowing. This “compression” phase typically lasts 10 to 15 minutes, depending on the prescribed pressure.
Step 4: At Pressure and Breathing Oxygen
Once the target pressure is reached (typically 1.5 to 2.4 ATA), you’ll begin breathing 100% oxygen. At MD Hyperbaric, this is delivered directly via a comfortable mask.
Most patients simply rest during this time. Sessions usually last between 60 and 90 minutes. Many people read, nap, or meditate.
Many patients report a sense of calm or clarity during or after their session. The chamber remains temperature-controlled and monitored at all times.
Step 5: Decompression and Exit
At the end of the session, the chamber is gradually depressurized. This decompression phase takes another 10 to 15 minutes. You may again feel pressure changes in your ears, and your technician will guide you through clearing your ears as needed.
Once the pressure returns to normal, the chamber door is opened, and you can exit. Many patients return to normal activities immediately, while some report feeling a little hungry as their body is putting to use all of the extra oxygen it just received.
Common Sensations During HBOT
- Ear pressure: Most noticeable during pressurization and decompression. Easily managed with simple techniques.
- Mild warmth or coolness: Chambers are temperature-regulated, but shifts in airflow can sometimes feel slightly warm or cool.
- Relaxation or sleepiness: It’s common to feel deeply relaxed. Some people nap during their sessions.
- Clarity or refreshed feeling: While individual experiences vary, many report feeling energized or clear-headed afterward.
What HBOT Does Not Feel Like
- Painful: The session should never be painful. Discomfort from ear pressure can occur, but staff are trained to help you adjust.
- Claustrophobic (for most people): Modern HBOT chambers, like those at MD Hyperbaric, are spacious and comfortable. If you are concerned, speak with your provider ahead of time.
- Overwhelming: The pace of each session is gentle and supervised. Staff guide you throughout the experience.
Final Thoughts
HBOT sessions are comfortable, quiet, and non-invasive. While the environment is unique, most people adapt quickly and enjoy the time as an opportunity to rest and recharge. At MD Hyperbaric, patient comfort, safety, and support are prioritized at every step.
If you’re curious about whether HBOT is a good fit for you, consider booking a Discovery Call. Understanding the experience is the first step toward making an informed decision.
Disclaimer: This article is for informational purposes only and does not constitute medical or insurance advice. Please consult a qualified healthcare provider for personal recommendations and check with your insurance company for current policy details.