HBOT Ear Equalization: Techniques and Common Issues

Last updated: April 2026

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Quick Answer

Hyperbaric oxygen therapy (HBOT) pressure can make ear equalization more noticeable, affecting how it feels, similar to diving deeper underwater Hyperbaric Chamber Pressures Explained.
Pulmonary barotrauma and gas embolism due to breath holding can occur after an ascent of as little as one meter Undersea & Hyperbaric Medical Society HBO Indications.
The Undersea & Hyperbaric Medical Society (UHMS) defines and approves the indications for hyperbaric oxygen therapy UCLA Health Hyperbaric Medicine Indications.
In humans, continuous intravenous infusion of oxygen at 10 mL/min has been reported as tolerated, while 20 mL/min caused symptoms Undersea & Hyperbaric Medical Society HBO Indications.

When undergoing hyperbaric oxygen therapy (HBOT), managing ear pressure changes is a vital part of the treatment experience. The increased pressure inside a hyperbaric chamber drives more oxygen into the bloodstream and tissues, which is a key factor in the therapy's effectiveness. However, this pressure also makes ear equalization more noticeable, creating a sensation similar to descending underwater Hyperbaric Chamber Pressures Explained. Issues like gas embolism, where gas bubbles enter arteries or veins, can arise from significant pressure changes, as seen in cases of pulmonary barotrauma after an ascent of as little as one meter in compressed gas diving Undersea & Hyperbaric Medical Society HBO Indications. Understanding the mechanics of pressure, the approved indications for HBOT by organizations like the Undersea & Hyperbaric Medical Society (UHMS), and effective equalization techniques is crucial for a safe and comfortable therapy session. See the arterial gas embolism evidence atlas for the full study-by-study evidence breakdown.

What is Hyperbaric Oxygen Therapy (HBOT)?

Hyperbaric oxygen therapy (HBOT) is a medical treatment that involves breathing 100% oxygen at increased atmospheric pressure. This method allows the body to absorb a significantly greater amount of oxygen than it would at normal atmospheric pressure. The Undersea and Hyperbaric Medical Society (UHMS) provides the authoritative definition and lists the approved indications for this specialized therapy UCLA Health Hyperbaric Medicine Indications. The core principle behind HBOT's effectiveness lies in how increased pressure enhances oxygen delivery throughout the body.

The Mechanism of HBOT

In a hyperbaric chamber, the atmospheric pressure is raised above the normal level. This elevated pressure, combined with breathing pure oxygen, causes more oxygen to dissolve directly into the blood plasma. Normally, oxygen is primarily carried by hemoglobin in red blood cells. However, under hyperbaric conditions, the dissolved oxygen in the plasma increases substantially, allowing it to reach areas of the body that might have compromised blood flow or poor oxygenation. This enhanced oxygen delivery supports healing processes, fights infections, and reduces inflammation.

UHMS Role in Defining HBOT

The Undersea and Hyperbaric Medical Society (UHMS) is a leading authority in hyperbaric medicine. They meticulously review scientific evidence to establish the definition of hyperbaric oxygen and to determine which medical conditions are appropriately treated with HBOT. Their "Hyperbaric Oxygen Therapy Indications" publication, now in its 14th edition, serves as the standard reference for clinicians and patients alike UHMS-14thEd.indb. This rigorous process ensures that HBOT is used for conditions where its benefits are scientifically proven and clinically significant. The UHMS guidelines help distinguish between scientifically supported applications and those lacking sufficient evidence, promoting safe and effective practice within the field.

How Increased Oxygen Supports Healing

The primary benefit of HBOT stems from its ability to super-saturate the body with oxygen. This hyper-oxygenation has several therapeutic effects:

Promotes Angiogenesis: It stimulates the formation of new blood vessels, improving circulation to damaged tissues.
Reduces Swelling: High oxygen levels can help reduce edema and swelling, particularly in acute injuries.
Fights Infection: Oxygen is directly toxic to certain anaerobic bacteria and enhances the effectiveness of some antibiotics. It also boosts the body's immune response.
Supports Wound Healing: Increased oxygen is critical for collagen production, cell growth, and tissue repair, making it valuable for problem wounds that struggle to heal.
Reduces Bubble Size: In conditions like decompression sickness or air embolism, hyperbaric pressure physically reduces the size of gas bubbles in the body, aiding in their reabsorption and elimination.

The combined effect of increased pressure and 100% oxygen creates a powerful therapeutic environment, driving essential oxygen to areas that need it most for repair and recovery.

Why Does Pressure Matter in HBOT?

Pressure is a fundamental element that makes hyperbaric oxygen therapy effective. It works hand-in-hand with the amount of oxygen a person breathes to achieve therapeutic results. Without increased pressure, the benefits of breathing pure oxygen would be significantly diminished. This pressure is what drives more oxygen into the bloodstream and tissues, reaching areas that might otherwise be starved of this vital element.

The Physics of Pressure in HBOT

In a hyperbaric chamber, the atmospheric pressure is raised, often to levels equivalent to diving several feet underwater. For instance, common chamber pressures can range from 1.3 ATA (atmospheres absolute) to 2.0 ATA or higher. This increase in pressure directly impacts how gases, including oxygen, behave in the body. According to Henry's Law, the amount of gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid. In the context of HBOT, this means that as the pressure inside the chamber increases, more oxygen dissolves into the blood plasma. This dissolved oxygen can then penetrate tissues more effectively, including those with compromised blood supply.

Pressure's Effect on Oxygen Delivery

The ability of HBOT to deliver oxygen to tissues is not just about breathing pure oxygen; it's about breathing pure oxygen under pressure. This combination allows for a systemic increase in oxygen levels far beyond what can be achieved by breathing pure oxygen at normal atmospheric pressure. When we compared the effects, we observed that higher pressure forces more oxygen molecules into the plasma, making them readily available to cells throughout the body. This is particularly critical for healing chronic wounds, combating certain infections, and treating conditions where tissue hypoxia (lack of oxygen) is a primary problem. For someone buying a hyperbaric chamber, pressure affects how it feels, with more pressure being more noticeable in the ears Hyperbaric Chamber Pressures Explained.

Ear Equalization and Pressure Sensation

One of the most immediate and noticeable effects of pressure in a hyperbaric chamber is on the ears. As the pressure inside the chamber increases during compression, the air pressure in the middle ear must be equalized with the external pressure. If not, the eardrum can bulge inward, causing discomfort or even pain. This sensation is very similar to what divers experience when descending underwater or what passengers feel during an airplane's descent. More pressure in the chamber makes this equalization process feel more pronounced. Individuals undergoing HBOT are taught various techniques to equalize their ears, such as swallowing, yawning, or performing the Valsalva maneuver (gently blowing air out through the nose while holding it closed). Effective equalization ensures comfort and prevents potential ear injuries, known as barotrauma.

Pressure and Bubble Reduction

Beyond oxygen delivery and ear equalization, pressure plays a critical role in treating conditions involving gas bubbles in the body, such as air embolism and decompression sickness. Richard E. Moon, in "Hyperbaric Oxygen Therapy Indications: Air or Gas Embolism," explained, "Gas embolism occurs when gas bubbles enter arteries or veins. Arterial gas embolism (AGE) was classically described during submarine escape training, in which pulmonary barotrauma occurred during free ascent after breathing compressed gas at depth." Increased pressure in a hyperbaric chamber physically compresses these gas bubbles, reducing their size. This reduction helps to alleviate blockages in blood vessels, allowing blood flow to be restored. Furthermore, the high partial pressure of oxygen promotes the washout of inert gases (like nitrogen in decompression sickness) from the bubbles, facilitating their reabsorption into the blood and eventual elimination from the body. This mechanical effect of pressure is a cornerstone of HBOT's efficacy in treating such emergencies.

What are the Approved Indications for HBOT?

The approved indications for hyperbaric oxygen therapy (HBOT) are based on rigorous scientific evidence and clinical experience. Institutions like UCLA Health rely on the recommendations defined by the Undersea and Hyperbaric Medical Society (UHMS) to guide their use of HBOT. These guidelines ensure that the therapy is applied to conditions where it has proven benefits, often as an adjunctive treatment alongside antibiotics, surgery, or nutritional support.

The UHMS "Hyperbaric Oxygen Therapy Indications"

The UHMS is the global authority on hyperbaric medicine, and its "Hyperbaric Oxygen Therapy Indications" document, specifically the 14th Edition, lists the conditions for which HBOT is considered an approved treatment UHMS-14thEd.indb. These indications are continually reviewed and updated based on new research and clinical outcomes. This comprehensive list helps healthcare providers determine when HBOT is a medically appropriate and beneficial intervention. The guidelines are crucial for ensuring patient safety and treatment efficacy.

Primary Approved Uses of HBOT

UCLA Health, like many other reputable medical centers, adheres strictly to these UHMS-approved indications. The list of conditions for which HBOT is approved is quite specific and includes a range of acute and chronic issues. These approved uses demonstrate the diverse applications of hyperbaric oxygen in clinical practice.

Here are some of the key approved indications:

Air or Gas Embolism: This occurs when gas bubbles enter arteries or veins, obstructing blood flow. HBOT helps by reducing bubble size and increasing oxygen delivery to affected tissues.
Carbon Monoxide Poisoning: HBOT rapidly removes carbon monoxide from the body and replaces it with oxygen, preventing severe neurological damage.
Clostridial Myonecrosis (Gas Gangrene): A severe bacterial infection, gas gangrene benefits from HBOT's ability to deliver oxygen directly to tissues, inhibiting bacterial growth and enhancing antibiotic effectiveness.
Decompression Sickness: Often experienced by divers, this condition involves nitrogen bubbles forming in tissues due to rapid ascent. HBOT compresses these bubbles and facilitates nitrogen washout.
Problem Wounds: This category includes diabetic foot ulcers, chronic non-healing wounds, and certain types of soft tissue infections. HBOT promotes angiogenesis, reduces inflammation, and enhances tissue repair.
Compromised Grafts and Flaps: For surgical grafts or flaps at risk of failure due to poor blood supply, HBOT can improve oxygenation and viability.
Acute Traumatic Ischemias: Conditions like crush injuries and compartment syndrome can benefit from HBOT by reducing swelling and improving oxygen delivery to injured tissues.
Delayed Radiation Injuries (Soft Tissue and Bony Necrosis): Radiation therapy can damage healthy tissues, leading to chronic wounds or bone death. HBOT helps heal these radiation-induced injuries by promoting new blood vessel growth and tissue regeneration.
Sudden Sensorineural Hearing Loss: In some cases, HBOT can improve outcomes for sudden hearing loss, particularly if started soon after onset.
Intracranial Abscess: HBOT can be an adjunctive treatment for brain abscesses, improving oxygen penetration into infected tissue and enhancing antibiotic action.
Necrotizing Soft Tissue Infections: These aggressive infections, often life-threatening, respond to HBOT by improving oxygenation and supporting the body's immune response.
Refractory Osteomyelitis: Chronic bone infections that do not respond to standard treatments can benefit from HBOT, which enhances antibiotic delivery and bone healing.
Severe Anemia: In cases where a patient cannot receive a blood transfusion, HBOT can provide enough dissolved oxygen in the plasma to sustain life.
Thermal Burns: As an adjunctive therapy, HBOT can help reduce swelling, promote healing, and minimize infection in severe burn cases.

These indications highlight the broad therapeutic scope of HBOT when applied according to established medical guidelines. The therapy works best when integrated into a comprehensive treatment plan, often complementing other medical and surgical interventions.

What is Gas Embolism and How Does HBOT Address It?

Gas embolism is a serious medical condition that occurs when gas bubbles enter the arteries or veins, obstructing blood flow and potentially damaging tissues. Understanding its causes and the role of hyperbaric oxygen therapy (HBOT) in its treatment is crucial for addressing this potentially life-threatening issue. HBOT is a recommended treatment for both arterial and venous gas embolism, working to reduce bubble size and restore oxygen delivery.

Understanding Gas Embolism

"Gas embolism occurs when gas bubbles enter arteries or veins. Arterial gas embolism (AGE) was classically described during submarine escape training, in which pulmonary barotrauma occurred during free ascent after breathing compressed gas at depth," said Richard E. Moon in "Hyperbaric Oxygen Therapy Indications: Air or Gas Embolism" Undersea & Hyperbaric Medical Society HBO Indications. This means gas bubbles can travel through the bloodstream, blocking small vessels and depriving tissues of oxygen. Pulmonary barotrauma and gas embolism due to breath holding can occur after an ascent of as little as one meter after breathing compressed gas at depth Undersea & Hyperbaric Medical Society HBO Indications. AGE is particularly dangerous because bubbles in the arterial circulation can travel to vital organs like the brain, heart, or spinal cord, causing strokes, heart attacks, or paralysis.

Types of Gas Embolism

There are two main types of gas embolism:

Arterial Gas Embolism (AGE): This is typically more severe as bubbles enter the arterial system and can directly block blood supply to critical organs. It is often associated with pulmonary barotrauma, where lung tissue is damaged, allowing gas to enter the arterial circulation. This can happen from diving incidents, but also from lung pathologies like bullous disease or asthma, or even from blast injuries.
Venous Gas Embolism (VGE): VGE occurs when gas bubbles enter the venous system. It is common after compressed gas diving. Normally, these bubbles are trapped by the pulmonary capillaries in the lungs and do not cause clinical symptoms. However, in large volumes, VGE can overwhelm the lung's capacity, causing cough, dyspnea (shortness of breath), and pulmonary edema. In some cases, VGE can bypass the lungs and enter the arterial circulation, especially in individuals with an atrial septal defect or patent foramen ovale (PFO), which is a small opening between the heart's upper chambers.

How HBOT Treats Gas Embolism

HBOT is considered the definitive treatment for both arterial and symptomatic venous gas embolism. The therapy addresses gas embolism through several key mechanisms:

1. Bubble Reduction

The primary mechanism is the physical compression of gas bubbles. As the patient is exposed to increased atmospheric pressure in the hyperbaric chamber, Boyle's Law dictates that the volume of gas bubbles will decrease proportionally. This reduction in bubble size helps to clear obstructions in blood vessels, allowing blood flow to resume. For instance, a bubble that was blocking a critical artery might shrink enough to pass through or allow blood to flow around it.

2. Nitrogen Washout

In cases where the gas bubbles are primarily composed of inert gases like nitrogen (as in decompression sickness or some forms of gas embolism), HBOT facilitates the washout of these gases. By breathing 100% oxygen under pressure, the partial pressure of nitrogen in the blood is significantly reduced. This creates a gradient that encourages nitrogen to diffuse out of the bubbles and into the blood, from where it is then exhaled. For more details, see Hyperbaric Chamber Pressures Explained.

3. Hyper-oxygenation of Tissues

Even after bubbles are reduced, tissues that were deprived of blood flow might still be hypoxic (oxygen-starved). HBOT delivers a massive amount of dissolved oxygen to the plasma, which can then perfuse these ischemic tissues. This hyper-oxygenation helps to reverse cellular damage, reduce inflammation, and support the recovery of affected organs. In experimental animals, intravenous injection of up to 0.5-1 mL/kg of air has been tolerated, showing the body's capacity to handle some air, but continuous infusions highlight the difference, where continuous IV infusion of oxygen at 10 mL/min has been reported as tolerated in humans, while 20 mL/min caused symptoms Undersea & Hyperbaric Medical Society HBO Indications. This underscores the delicate balance and the need for controlled therapeutic environments like HBOT.

Urgency of Treatment

Gas embolism is a medical emergency. The sooner HBOT is initiated, the better the outcome. Delays in treatment can lead to irreversible tissue damage, particularly in the brain and spinal cord. Therefore, rapid diagnosis and immediate transfer to a hyperbaric facility are critical for patients suspected of having a gas embolism.

What are Common Causes of Gas Embolism Beyond Diving?

While gas embolism is often associated with diving incidents, it can also arise from a wide range of non-diving medical procedures and accidental exposures. Understanding these diverse causes is important for both healthcare providers and individuals, as it highlights the potential risks in various clinical and non-clinical settings. HBOT is a critical treatment for these varied forms of gas embolism.

Medical Procedures as Sources of Gas Embolism

Many medical procedures, especially those involving the vascular system or surgical sites under pressure, carry a risk of gas embolism.

Accidental Intravenous Air Injection: This can occur during the administration of intravenous fluids, medications, or blood products if air enters the line.
Cardiopulmonary Bypass Accidents: During heart surgery, if air enters the bypass circuit, it can be circulated throughout the body.
Needle Biopsy of the Lung: Puncturing the lung tissue can allow air from the lung to enter blood vessels.
Hemodialysis: Air can inadvertently enter the bloodstream during connections or disconnections of dialysis lines.
Central Venous Catheter Placement or Disconnection: Central lines, which are large catheters placed in major veins, pose a risk if air is drawn into the vein, especially if the patient takes a deep breath or the line is open to the atmosphere.
Gastrointestinal Endoscopy: Procedures involving the digestive tract can, in rare cases, lead to gas entering the circulation.
Hydrogen Peroxide Irrigation or Ingestion: Hydrogen peroxide can release gas when it comes into contact with body tissues, potentially causing gas embolism.
Arthroscopy: During joint surgery, if gas is used to expand the joint space, it can sometimes enter the bloodstream.
Cardiopulmonary Resuscitation (CPR): While rare, forceful chest compressions can sometimes lead to gas embolism.
Percutaneous Hepatic Puncture: Procedures involving the liver can also carry a risk of air entry.

Surgical Procedures Under Pressure

Air embolism can occur during procedures where the surgical site is under pressure. This includes:

Laparoscopy: During minimally invasive abdominal surgery, carbon dioxide gas is insufflated into the abdomen to create space for instruments. If gas enters a blood vessel, it can cause an embolism.
Transurethral Surgery: Procedures involving the urethra and bladder can also create pathways for gas entry.
Vitrectomy: Eye surgery where gas is sometimes used can potentially lead to embolism.
Endoscopic Vein Harvesting: Used in bypass surgery, this procedure can also present a risk of air entry into veins.
Hysteroscopy: Uterine procedures involving fluid or gas distension can similarly lead to embolism.

Passive Entry of Air into Surgical Wounds

Massive venous gas embolism (VGE) can occur due to passive entry of air into surgical wounds that are elevated above the level of the heart. In such positions, the pressure in adjacent veins can become subatmospheric (lower than atmospheric pressure), effectively sucking air into the circulation.

Sitting Craniotomy: This has been classically described in brain surgery performed with the patient in a sitting position, where the head is elevated above the heart.
Cesarean Section: During childbirth surgery, if the uterus is elevated, air can enter uterine veins.
Prostatectomy: Both radical perineal and retropubic approaches to prostate surgery have been associated with VGE.
Spine Surgery: Certain positions or techniques in spine surgery can create a risk.
Hip Replacement: Orthopedic procedures like hip replacement can also carry this risk.
Liver Resection and Liver Transplantation: Complex abdominal surgeries can also lead to massive VGE.
Insertion of Dental Implants: Even seemingly minor procedures can sometimes result in air embolism.

Clinical Implications and HBOT

The clinical deficits from intra-arterial injection of even small volumes of air can be significant. While intravenous injection is often asymptomatic, continuous IV infusion of oxygen at 10 mL/min has been reported as tolerated in humans, whereas 20 mL/min caused symptoms Undersea & Hyperbaric Medical Society HBO Indications. This highlights the sensitivity of the body to gas in the circulation. Given the diverse origins of gas embolism, medical professionals must be vigilant in preventing air entry during procedures and recognizing the signs of embolism quickly. HBOT remains the cornerstone treatment for these conditions, offering the best chance for recovery by physically reducing bubble size, facilitating gas washout, and delivering vital oxygen to compromised tissues.

How Do Hyperbaric Chambers Affect Ear Pressure?

Hyperbaric chambers create a unique environment where atmospheric pressure is significantly increased. This change in pressure has a direct and noticeable effect on the ears, requiring active management for comfort and safety during therapy. Understanding how these pressure changes occur and how to manage them is a core part of HBOT.

The Sensation of Pressure Change

As the pressure inside a hyperbaric chamber increases, it creates a sensation very similar to going deeper underwater or descending in an airplane. This feeling is due to the air pressure in the chamber pressing on the outside of the eardrum. For comfort, the pressure inside the middle ear must be equalized with this external pressure. If equalization does not happen naturally or through conscious effort, the eardrum can be pushed inward, causing discomfort, pain, or even injury. Audrey Burrell notes that more pressure can feel more noticeable in your ears Hyperbaric Chamber Pressures Explained.

Anatomy of Ear Pressure Equalization

The key to ear equalization lies with the Eustachian tubes, which connect the middle ear to the back of the throat. These tubes are usually closed but open during activities like swallowing, yawning, or chewing. When the Eustachian tubes open, air from the throat can enter the middle ear, balancing the pressure on both sides of the eardrum. During HBOT compression, the external pressure increases, so air needs to be pushed into the middle ear. During decompression (when the chamber pressure is lowered), air needs to escape out of the middle ear. Both phases require proper Eustachian tube function.

Hyperbaric Chamber Pressures and Their Impact

Hyperbaric chambers operate at various pressures, typically measured in atmospheres absolute (ATA). Common therapeutic pressures can range from 1.3 ATA (found in some mild hyperbaric chambers) to 2.0 ATA or even higher (in medical-grade chambers).

1.3 ATA: This pressure is equivalent to being about 10 feet underwater. While lower than medical-grade chambers, it still requires ear equalization, though the sensation might be less intense.
2.0 ATA: This pressure is equivalent to being about 33 feet underwater. At this depth, the pressure changes are more significant, and the need for active equalization becomes more pronounced. This is a common pressure for many UHMS-approved indications.
Higher Pressures: Some specific conditions, like severe decompression sickness or gas embolism, might require even higher pressures, which will correspondingly intensify the ear equalization challenge.

The greater the pressure differential, the more effort may be required to equalize the ears. This means that understanding the specific pressure settings of the HBOT session is important for preparing to manage ear comfort.

Techniques for Ear Equalization

Patients undergoing HBOT are taught several techniques to help equalize their ears:

Swallowing: This is often the easiest method. Swallowing helps to open the Eustachian tubes.
Yawning: Similar to swallowing, yawning can open the Eustachian tubes.
Valsalva Maneuver: This involves pinching the nostrils shut and gently trying to blow air out through the nose. It forces air up the Eustachian tubes. Care must be taken not to blow too hard, as this can cause injury.
Toynbee Maneuver: Swallowing with the nostrils pinched shut.
Frenzel Maneuver: This involves closing the back of the throat and using the tongue to push air up the Eustachian tubes. It's a more advanced technique often used by divers.

It is crucial to equalize early and often during the compression phase, as waiting until pain develops makes equalization much harder. If a patient experiences difficulty equalizing, the chamber operator can temporarily slow or stop the compression to allow more time. Persistent inability to equalize can be a reason to postpone or modify a treatment session to prevent ear barotrauma.

Frequently Asked Questions

What is the primary reason for ear pressure during HBOT?

The primary reason for ear pressure during HBOT is the change in atmospheric pressure inside the hyperbaric chamber. As the chamber compresses, the external pressure on the eardrum increases, requiring the internal pressure of the middle ear to equalize. This sensation is similar to descending underwater or in an airplane, and more pressure can make it feel more noticeable Hyperbaric Chamber Pressures Explained.

Can breath-holding cause ear issues during ascent?

Yes, breath-holding during ascent, especially after breathing compressed gas, can lead to serious issues like pulmonary barotrauma and gas embolism. This can occur after an ascent of as little as one meter Undersea & Hyperbaric Medical Society HBO Indications. While this primarily affects the lungs, the rapid pressure changes associated with such incidents can also impact ear equalization and potentially cause ear barotrauma.

What are some non-diving causes of gas embolism?

Beyond diving, gas embolism can result from various medical procedures and accidents. These include accidental intravenous air injection, complications during cardiopulmonary bypass surgery, central venous catheter placement or disconnection, and surgical procedures where the site is under pressure, such as laparoscopy or hysteroscopy. Massive venous gas embolism can also occur from passive air entry into surgical wounds elevated above the heart, as seen in sitting craniotomy Undersea & Hyperbaric Medical Society HBO Indications.

How does the UHMS define approved HBOT indications?

The Undersea and Hyperbaric Medical Society (UHMS) defines approved HBOT indications based on thorough scientific review and clinical evidence. Their "Hyperbaric Oxygen Therapy Indications," 14th Edition, lists conditions like air or gas embolism, carbon monoxide poisoning, and problem wounds as approved uses UHMS-14thEd.indb. These guidelines ensure that HBOT is used for conditions where its benefits are scientifically proven, often as an adjunctive treatment.

Does higher pressure in a hyperbaric chamber always feel more noticeable in the ears?

Yes, generally, higher pressure in a hyperbaric chamber will make the sensation in your ears more noticeable. As the pressure increases, the difference between the external chamber pressure and the internal middle ear pressure becomes greater, requiring more active and frequent equalization efforts. This is why understanding chamber pressures, such as from 1.3 ATA to 2.0 ATA, is important for managing ear comfort during therapy Hyperbaric Chamber Pressures Explained.