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<!DOCTYPE html>
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<title>Safety — HBOT Science</title>
<meta name="description" content="Safety profile, contraindications, and risk comparison between home and clinical HBOT chambers.">
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<!-- ── Page Header ── -->
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<div class="container">
<h1>Safety & Contraindications</h1>
</div>
</header>
<!-- ── Absolute Contraindications ── -->
<section id="absolute">
<div class="container">
<h2>Absolute Contraindications</h2>
<p class="section-intro">
<span class="tech">Conditions where HBOT must not be administered regardless of setting or pressure.</span>
<span class="plain">Conditions where you should not use HBOT at all.</span>
</p>
<div class="tech">
<ul class="content-list">
<li><strong>Untreated <a class="term" href="glossary.html#pneumothorax">pneumothorax</a>.</strong> Pressurization can convert a simple pneumothorax to tension pneumothorax during depressurization—a life-threatening emergency.</li>
<li><strong>Untreated intraocular gas.</strong> Post-surgical SF<sub>6</sub> or C<sub>3</sub>F<sub>8</sub> gas expands under pressure changes, risking retinal detachment or permanent vision loss. Wait 3–6 months post-surgery for full gas resorption.</li>
<li><strong>Certain chemotherapy agents.</strong> Bleomycin causes fatal pulmonary toxicity potentiated by <a class="term" href="glossary.html#hyperoxia">hyperoxia</a>. Doxorubicin increases cardiotoxicity risk. Cisplatin and Disulfiram (which blocks superoxide dismutase) are also contraindicated. Get oncologist clearance before combining HBOT with any active or recent chemotherapy.</li>
</ul>
</div>
<div class="plain">
<ul class="content-list">
<li><strong>Collapsed lung (<a class="term" href="glossary.html#pneumothorax">pneumothorax</a>).</strong> Pressure changes in the chamber can make a collapsed lung much worse. Must be treated first.</li>
<li><strong>Recent eye surgery with gas bubble.</strong> Some eye surgeries leave a gas bubble inside the eye that expands dangerously under pressure. Wait 3–6 months for it to absorb.</li>
<li><strong>Certain chemo drugs.</strong> Some chemotherapy drugs (especially Bleomycin, Doxorubicin, and Cisplatin) interact badly with high oxygen. Get your oncologist's clearance.</li>
</ul>
</div>
</div>
</section>
<!-- ── Relative Contraindications ── -->
<section id="relative">
<div class="container">
<h2>Relative Contraindications</h2>
<p class="section-intro">
<span class="tech">These require evaluation, not automatic exclusion. Many patients with these conditions use HBOT safely with appropriate monitoring.</span>
<span class="plain">These need a conversation with your doctor, but they don't automatically rule you out.</span>
</p>
<div class="tech">
<ul class="content-list">
<li><strong>Active upper respiratory infection or sinusitis.</strong> Mucosal swelling impairs <a class="term" href="glossary.html#eustachian">Eustachian tube</a> equalization, increasing <a class="term" href="glossary.html#barotrauma">barotrauma</a> risk. Delay until resolved.</li>
<li><strong>Seizure disorders.</strong> Oxygen lowers seizure threshold. Incidence at clinical pressure (2.0–3.0 ATA, ppO<sub>2</sub> 2.0–3.0 atm): ~1 in 634 treatments. At 1.5 ATA with 93% O<sub>2</sub>, <a class="term" href="glossary.html#ppo2">ppO<sub>2</sub></a> is ~1.4 atm—below the ~1.6 atm CNS toxicity threshold entirely.</li>
<li><strong>COPD or emphysema.</strong> Bullae rupture risk under pressure changes. Imaging review recommended.</li>
<li><strong>Pregnancy.</strong> Insufficient human data to establish safety. Animal studies haven't shown harm, but no one runs RCTs on pregnant women.</li>
<li><strong>Implanted devices.</strong> Pacemakers, cochlear implants, and similar devices have pressure ratings. Most modern devices are rated well above 1.5 ATA. Check with manufacturer.</li>
<li><strong>Severe claustrophobia.</strong> Manageable in many cases—soft chambers are see-through and can be unzipped from the inside. Anxiolytics used in clinical settings.</li>
</ul>
</div>
<div class="plain">
<ul class="content-list">
<li><strong>Cold or sinus infection.</strong> Congestion makes it hard to equalize ear pressure. Wait until you're over it.</li>
<li><strong>Seizure disorders.</strong> High oxygen can lower the seizure threshold. At home pressure, oxygen levels (~1.4 ppO<sub>2</sub>) stay below the ~1.6 seizure threshold. Clinical incidence is ~1 in 634 at much higher levels.</li>
<li><strong>COPD or emphysema.</strong> Weakened lung tissue can be stressed by pressure changes. Get imaging reviewed first.</li>
<li><strong>Pregnancy.</strong> Not enough human data. Probably fine, but no one's proven it.</li>
<li><strong>Implanted devices.</strong> Pacemakers, cochlear implants, etc. Most modern ones handle 1.5 ATA easily. Check the manufacturer rating.</li>
<li><strong>Severe claustrophobia.</strong> Soft chambers are see-through and unzip from the inside. Most people adapt within a few sessions.</li>
</ul>
</div>
</div>
</section>
<!-- ── Common Side Effects ── -->
<section id="side-effects">
<div class="container">
<h2>Common Side Effects</h2>
<div class="table-wrap">
<table>
<thead>
<tr><th>Side Effect</th><th>Frequency</th><th>Details</th></tr>
</thead>
<tbody>
<tr>
<td>Ear <a class="term" href="glossary.html#barotrauma">barotrauma</a></td>
<td>~50% of users report it at some point; ~2% of individual treatments</td>
<td>
<span class="tech">Middle ear <a class="term" href="glossary.html#barotrauma">barotrauma</a> from <a class="term" href="glossary.html#eustachian">Eustachian tube</a> dysfunction during pressurization. Improves as equalization technique develops. Rare at 1.5 ATA vs. higher pressures.</span>
<span class="plain">Ear pressure or pain during pressurization, similar to flying. Gets easier with practice. Much milder at home pressure than clinical.</span>
</td>
</tr>
<tr>
<td>Claustrophobia</td>
<td>~25% report it initially</td>
<td>
<span class="tech">Anxiety response to enclosed space. Soft chambers mitigate this—transparent walls, interior unzipping, lower perceived confinement. Most patients habituate within three to five sessions.</span>
<span class="plain">Feeling closed in. Soft chambers are see-through and you can unzip from inside. Most people adapt within three to five sessions.</span>
</td>
</tr>
<tr>
<td>Temporary <a class="term" href="glossary.html#myopia">myopia</a></td>
<td>Uncommon</td>
<td>
<span class="tech">Lens refractive index change from prolonged hyperoxia exposure. Fully reversible within weeks of stopping treatment. More common in extended clinical protocols (>40 sessions at 2.0+ ATA).</span>
<span class="plain">Mild nearsightedness that goes away within weeks after you stop. More common at clinical pressure than home.</span>
</td>
</tr>
<tr>
<td>Fatigue / brain fog</td>
<td>Common early (sessions 1–35)</td>
<td>
<span class="tech">Expected component of the healing response. Immune upregulation and inflammatory clearance are metabolically expensive. Resolves as adaptive processes outpace inflammatory load.</span>
<span class="plain">Your body is doing repair work and that takes energy. Normal during the first month. Clears up as you turn the corner around session 35.</span>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</section>
<!-- ── Home vs Clinical Risk ── -->
<section id="risk-comparison">
<div class="container">
<h2>Home vs. Clinical Risk</h2>
<div class="table-wrap">
<table>
<thead>
<tr><th>Risk</th><th>Home (1.3–1.5 ATA, concentrator)</th><th>Clinical (2.0–3.0 ATA, 100% O<sub>2</sub>)</th></tr>
</thead>
<tbody>
<tr>
<td><strong>Fire</strong></td>
<td>
<span class="tech">Negligible. Chamber fills with normal air; concentrator delivers 93% O<sub>2</sub> only through the mask. Ambient O<sub>2</sub> in chamber stays near 21%.</span>
<span class="plain">Negligible. The chamber is filled with normal air. Oxygen only goes through your mask.</span>
</td>
<td>
<span class="tech">Real risk. Monoplace chambers flood with 100% O<sub>2</sub>. Everything becomes flammable. Strict protocols required.</span>
<span class="plain">Real. The whole chamber fills with pure oxygen. Static electricity or electronics can ignite it.</span>
</td>
</tr>
<tr>
<td><strong>O<sub>2</sub> toxicity seizure</strong></td>
<td>
<span class="tech">Negligible. <a class="term" href="glossary.html#ppo2">ppO<sub>2</sub></a> ~1.4 atm with <a class="term" href="glossary.html#concentrator">concentrator</a> at <a class="term" href="glossary.html#ata">1.5 ATA</a>. Below the ~1.6 atm Paul Bert threshold for CNS toxicity.</span>
<span class="plain">Negligible. The oxygen level at home pressure (~1.4 ppO<sub>2</sub>) stays below the ~1.6 seizure threshold.</span>
</td>
<td>
<span class="tech">Low but real. <a class="term" href="glossary.html#ppo2">ppO<sub>2</sub></a> 2.0–3.0 atm. Incidence ~1 in 634 treatments. Self-limiting (<a class="term" href="glossary.html#tonic-clonic">tonic-clonic</a> resolves when O<sub>2</sub> removed).</span>
<span class="plain">Low but real. About 1 in 634 treatments. Seizure stops when oxygen is removed.</span>
</td>
</tr>
<tr>
<td><strong>Barotrauma</strong></td>
<td>
<span class="tech">Mild. Maximum 7 PSI (0.5 ATA gauge). Equivalent to 11 feet of seawater. Ear barotrauma possible; sinus/pulmonary extremely rare.</span>
<span class="plain">Mild. 7 PSI max—like diving to 11 feet. Ear discomfort possible. Serious injury very rare.</span>
</td>
<td>
<span class="tech">Higher. 15–30 PSI (1.0–2.0 ATA gauge). Ear, sinus, and pulmonary barotrauma all documented.</span>
<span class="plain">Higher. 15–30 PSI. Ear, sinus, and lung barotrauma all documented.</span>
</td>
</tr>
<tr>
<td><strong>Decompression</strong></td>
<td>
<span class="tech">None. Below the threshold for nitrogen supersaturation at any treatment duration.</span>
<span class="plain">None. Home pressure is too low to cause decompression issues.</span>
</td>
<td>
<span class="tech">Minimal above 2.0 ATA. Standard treatment durations stay within no-decompression limits, but protocol adherence matters.</span>
<span class="plain">Minimal. Possible above 2.0 ATA with extended sessions, but clinical protocols manage this.</span>
</td>
</tr>
<tr>
<td><strong>Pulmonary O<sub>2</sub> toxicity</strong></td>
<td>
<span class="tech">Not at standard session lengths. Lorrain-Smith effect requires sustained high ppO<sub>2</sub> beyond what concentrator-based protocols produce.</span>
<span class="plain">Not a factor at standard session lengths with a concentrator.</span>
</td>
<td>
<span class="tech">Possible with extended or repeated sessions. Tracked via UPTD (Unit Pulmonary Toxicity Dose). Air breaks mitigate accumulation.</span>
<span class="plain">Possible with extended treatments. Managed with air breaks during sessions.</span>
</td>
</tr>
</tbody>
</table>
</div>
<div class="callout callout-green">
<p><strong>Zero reported deaths</strong> from home soft-shell chambers at 1.3–1.5 ATA with a concentrator. Every fatal HBOT incident on record involved clinical pressure, 100% O<sub>2</sub> from tanks, or both.</p>
</div>
</div>
</section>
<!-- ── References ── -->
<section id="refs">
<div class="container">
<h2>References</h2>
<div class="ref-section">
<h4>Adverse Effects</h4>
<p>Yan, L. et al. "Adverse effects of hyperbaric oxygen therapy: a systematic review and meta-analysis." <em>Front Med</em>, 2023.</p>
</div>
<div class="ref-section">
<h4>Seizure Incidence</h4>
<p>Hazzard, B. et al. Seizure incidence approximately 1 in 634 treatments. <em>PLoS One</em>, 2025.</p>
<p>Yildiz, S. et al. Seizure incidence in 80,679 patient-treatments. <em>Aviat Space Environ Med</em>, 2004.</p>
</div>
<div class="ref-section">
<h4>Fire Safety</h4>
<p>FDA Safety Communication regarding hyperbaric oxygen therapy fire hazards. August 2025.</p>
</div>
</div>
</section>
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<p><strong>Not medical advice.</strong> Consult your physician before starting HBOT or any new therapy.</p>
<p>Compiled from clinical literature, February 2026. <a href="index.html">Science</a> · <a href="safety.html">Safety</a> · <a href="costs.html">Costs</a> · <a href="glossary.html">Glossary</a></p>
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