Hyperbaric Chamber Side Effects and Safety

Carbon Wellness sells home hyperbaric chambers, and we want you to understand the side effects before you use one. This guide covers the common and rare side effects of hyperbaric oxygen therapy, who should be cautious, and how to keep home sessions safe.

A hyperbaric chamber raises the air pressure around your body while you breathe concentrated oxygen. That pressure change is what makes hyperbaric sessions work. It is also the source of nearly every side effect people experience.

Knowing the common hyperbaric chamber side effects ahead of time makes them easier to prevent, recognize, and manage. Below, we cover the common effects, the rare risks, who should avoid sessions, and practical steps for safer use at home.

What Are the Side Effects of a Hyperbaric Chamber?

The side effects of a hyperbaric chamber fall into two groups: pressure-related effects and oxygen-related effects. Pressure affects any air-filled space in your body, like your ears, sinuses, and lungs. Breathing extra oxygen, especially at higher pressures, can affect the eyes, the lungs, and in rare cases the brain.^[1]

Common, Usually Mild Side Effects

• Ear pressure or ear pain: a fullness or popping sensation, similar to what you feel as a plane descends^[1]
• Sinus pressure: pain or tightness around the forehead, cheeks, or behind the eyes, especially if you are congested^[2]
• Fatigue: feeling tired or sleepy after a session,^[2] which usually passes within a few hours
• Lightheadedness: a mild, temporary feeling when you first stand up after a session
• Claustrophobia or anxiety: feeling closed in, especially in smaller lying-down chambers^[2]
• Temporary changes in vision: some people notice slightly blurrier distance vision after a long series of sessions. It usually returns to normal within about 3 to 6 weeks of stopping.^[1]

Rare but Serious Side Effects

• Eardrum rupture: can happen if pressure builds and the ears are not equalized^[2]
• Lung barotrauma: injury to the lungs from pressure changes. It is very unlikely in people with healthy lungs who breathe normally, and most often affects people with existing lung disease or a collapsed lung.^[1]
• Oxygen toxicity seizures: rare, and seen mostly in clinical hyperbaric oxygen therapy at 2.0 ATA or higher with near-100% oxygen^[1]
• Low blood sugar: a concern for people with diabetes who use insulin, although clinically significant drops are uncommon^[1]
• Fire: oxygen-rich environments make materials ignite and burn more easily, so any spark or ignition source is a serious hazard^[3]

Hyperbaric Side Effects at a Glance

Most of these figures come from clinical hyperbaric oxygen therapy at higher pressures. Home chambers run at milder pressures, so rates may differ.

Ear Pain in a Hyperbaric Chamber

Ear pain is the hyperbaric side effect people ask about most, and for good reason. As the chamber pressurizes, the air outside your eardrum pushes inward. Your middle ear needs to balance that pressure through the Eustachian tube, the small passage that connects your ear to the back of your throat.

When the tube opens easily, you feel a pop and the pressure evens out. When it does not, pressure builds against the eardrum and causes discomfort or pain. Doctors call this middle ear barotrauma, and it is the most common side effect reported in research on clinical hyperbaric oxygen therapy.^[1]

How to Equalize Your Ears

• Swallow or yawn: both open the Eustachian tubes naturally^[2]
• Sip water or chew gum: repeated swallowing helps during pressurization (check that gum is allowed in your chamber's guidelines)
• Use a gentle Valsalva: pinch your nose, close your mouth, and blow gently until you feel your ears pop, without forcing it
• Try the Toynbee move: pinch your nose and swallow at the same time
• Equalize early: start as soon as pressurization begins, before you feel discomfort, and keep repeating

When to Stop

Pain is a signal, not something to push through. If your ears hurt and will not equalize, pause or slowly reduce pressure and try again. If the pain is sharp, you notice fluid draining from the ear, or your hearing feels muffled after a session, stop sessions and see a doctor.

Avoid sessions when you have a cold, sinus infection, or allergy congestion. Swollen tissue makes it much harder for the Eustachian tubes to open, and an active upper respiratory infection is a known risk factor for ear and sinus injury.^[1]

Is a Hyperbaric Chamber Safe?

For most healthy adults, yes. A hyperbaric chamber is generally considered safe when used correctly and according to the manufacturer's instructions. Serious complications are uncommon, and most side effects are mild and temporary.

Pressure plays a big role in risk. Clinical hyperbaric oxygen therapy usually runs at 2.0 to 3.0 ATA with near-100% oxygen. Home soft shell chambers typically run at 1.3 to 1.5 ATA with concentrated oxygen delivered by mask. Research links higher treatment pressures to higher rates of oxygen toxicity seizures, so lower pressure generally means less stress on the ears and a much lower risk of oxygen toxicity.^[1]

That said, mild pressure does not mean zero risk. Any chamber pressurizes your body, so the same basic precautions apply. If you are comparing pressure levels, our guide to soft and hard shell chambers explains how each type works.

The FDA has also received reports of fires involving hyperbaric devices that caused serious injuries and deaths, and it urges everyone to follow the device instructions closely.^[3] A hyperbaric chamber is not a substitute for medical treatment, so keep your doctor involved if you are managing a health condition.

Hyperbaric Chamber Risks: Who Should Be Cautious

Most hyperbaric chamber risks depend on your health history. Some conditions rule out sessions entirely, while others call for a conversation with your doctor first.

Do Not Use Without Medical Clearance If You Have:

• An untreated collapsed lung (pneumothorax), which is the only absolute reason to avoid hyperbaric sessions^[4]
• Current or recent treatment with certain chemotherapy drugs, such as bleomycin, cisplatin, or doxorubicin^[4]
• Any other prescription medication your doctor has not reviewed for use with hyperbaric oxygen^[2]

Talk to Your Doctor First If You Have:

• COPD, emphysema, cystic fibrosis, asthma, or a history of lung surgery^[2]
• A seizure disorder
• Recent ear injury or ear or sinus surgery, or chronic sinus problems^[2]
• Diabetes managed with insulin
• A fever, cold, or upper respiratory infection^[2]
• Heart failure or uncontrolled high blood pressure
• An implanted device, such as a pacemaker or pump, that may not be rated for pressure^[2]
• Severe claustrophobia
• A current or possible pregnancy

This list is not complete. Your doctor can review your full history and medications before you start.

Using a Hyperbaric Chamber While Pregnant

Using a hyperbaric chamber while pregnant has no simple yes-or-no answer. For wellness use, the safest approach is to avoid it unless your OB-GYN approves.

In hospitals, doctors do use clinical hyperbaric oxygen therapy during pregnancy for emergencies like carbon monoxide poisoning. In those cases, the danger to mother and baby outweighs the possible risks of treatment.^[5]

For elective or wellness sessions, the balance is different. Animal studies have shown that high oxygen levels can harm a developing fetus, and research in pregnant people is limited.^[5] Cleveland Clinic advises against hyperbaric oxygen therapy during pregnancy outside of emergencies, noting that it can narrow blood vessels in the placenta.^[2] Many chamber manufacturers also list pregnancy as a precaution.

Pregnancy also brings nasal congestion and swelling, which can make ear equalization harder.

If you are pregnant or trying to conceive, pause home sessions and talk to your doctor before resuming.

How to Lower Your Risk During Hyperbaric Sessions

• Get cleared first. Talk to your doctor before your first session, especially if any of the conditions above apply to you.
• Start low and slow. Begin at the lowest pressure setting with shorter sessions, and increase gradually as your ears and body adjust.
• Pressurize slowly. A slower climb gives your ears and sinuses more time to equalize.
• Breathe normally. Never hold your breath during pressurization or depressurization.^[1]
• Keep fire risks out. No phones, hand warmers, lighters, lotions, oils, or hair products inside the chamber.^[6] Keep the oxygen concentrator outside in a ventilated area.
• Wear cotton. The FDA recommends hyperbaric-compatible fabrics such as cotton, since some synthetic fabrics produce more static.^[3]
• Check blood sugar. If you have diabetes, check before and after sessions and keep a snack nearby.
• Skip sessions when sick. Colds, sinus infections, and fevers raise the chance of ear and sinus problems.^[1]
• Do not use the chamber alone at first. Have someone nearby for your first few sessions.
• Follow the manual. Every chamber has its own pressure limits, session guidelines, and maintenance steps.^[3]

Common Misconceptions About Hyperbaric Safety

"Mild chambers have no side effects."
Lower pressure reduces risk, but it does not remove it. Ear and sinus pressure can still happen at 1.3 ATA, and fire safety rules still apply whenever concentrated oxygen is present.

"Ear pain is normal and you should push through it."
Some fullness is normal. Real pain means your ears are not equalizing, and continuing to pressurize can damage the eardrum. Pause and equalize instead.

"Longer and more frequent sessions are always better."
More exposure also means more chance of side effects. Temporary vision changes, for example, are mostly seen after many sessions in a row.^[1] The goal is the smallest routine that meets your goals, with breaks between blocks of sessions, guided by your doctor's advice.

FAQ

How long do hyperbaric chamber side effects last?

Most common side effects, like ear fullness, fatigue, and lightheadedness, fade within minutes to a few hours after a session. Vision changes from a long series of sessions usually return to normal within about 3 to 6 weeks.^[1]

Can a hyperbaric chamber cause headaches?

Some people get mild headaches, usually from sinus pressure, dehydration, or tension during the session. Staying hydrated and avoiding sessions when congested often helps. If headaches are severe or keep coming back, talk to your doctor.

Can a hyperbaric chamber affect your eyes?

It can cause temporary nearsightedness, mostly after many daily sessions at clinical pressures. Most people recover fully after stopping.^[2] Tell your eye doctor if you notice changes.

Is it normal to feel tired after a session?

Yes. Feeling tired or relaxed afterward is common and usually passes within a few hours. Some people prefer evening sessions for this reason. Our guide on why you might feel tired after hyperbaric treatment explains more.

Can you get oxygen toxicity in a home hyperbaric chamber?

It is very unlikely. Oxygen toxicity seizures are rare even at clinical pressures of 2 to 3 ATA, and the risk rises with pressure.^[1] Home chambers run at much milder pressures, but you should still follow your chamber's session limits.

Can children use a hyperbaric chamber?

Children can have more trouble equalizing their ears and describing discomfort. Any use for a child should be discussed with a pediatrician first and always supervised by an adult.

What should I do if my ears won't pop?

Stop pressurizing, try swallowing, yawning, or a gentle Valsalva, and only continue once your ears equalize. If they still will not clear, end the session and try again another day. If pain continues afterward, see a doctor.

Final Takeaway

Hyperbaric chamber side effects are usually mild, temporary, and manageable. Ear pressure is the one most people notice, and equalizing early solves it in most cases.

Serious risks are rare and are mostly linked to higher clinical pressures or specific health conditions. That is why a medical check before you start matters, especially if you have lung disease, a seizure history, diabetes, or are pregnant.

Used correctly, with sensible precautions and your doctor's input, a hyperbaric chamber can be a safe part of a home wellness routine.

If you have questions about which chamber fits your comfort level and health needs, our team is happy to help.

References

1. ^ Heyboer M, Sharma D, Santiago W, McCulloch N (2017). "Hyperbaric Oxygen Therapy: Side Effects Defined and Quantified". Advances in Wound Care. 6 (6): 210–224. doi:10.1089/wound.2016.0718. PMID 28616361.
2. ^ "Hyperbaric Oxygen Therapy". Cleveland Clinic. Retrieved October 25, 2026.
3. ^ U.S. Food and Drug Administration (August 25, 2025). "Follow Instructions for Safe Use of Hyperbaric Oxygen Therapy Devices: Letter to Health Care Providers". FDA.
4. ^ Baude J, Cooper JS (2023). "Hyperbaric Contraindicated Chemotherapeutic Agents". StatPearls. Treasure Island (FL): StatPearls Publishing. PMID 32809708.
5. ^ Van Hoesen KB, Camporesi EM, Moon RE, Hage ML, Piantadosi CA (1989). "Should hyperbaric oxygen be used to treat the pregnant patient for acute carbon monoxide poisoning? A case report and literature review". JAMA. 261 (7): 1039–1043. doi:10.1001/jama.261.7.1039. PMID 2644457.
6. ^ "Hyperbaric Medicine Patient Support and Education". Dartmouth Health. Retrieved October 25, 2026.