🔉 Did tinnitus loudness improve?
None shown.
Cochrane (7 RCTs, N=392): significance of any tinnitus improvement 'could not be assessed'; no benefit for tinnitus present over 6 months.
Hyperbaric oxygen therapy (HBOT) for Tinnitus: What Does the Evidence Show?
Complementary & Alternative
Scope of this assessment. This page assesses treatments for tinnitus itself. Sudden hearing loss, with or without tinnitus, is a different and urgent situation: get a medical evaluation right away if your hearing suddenly drops or seems muffled (all at once or over a few days), even if it began several days ago. Some treatments are time-limited, but that is a reason to be seen now, not permission to wait. For sudden sensorineural hearing loss, the 2019 U.S. guideline (AAO-HNSF) lists hyperbaric oxygen combined with steroids as an option within 2 weeks of onset and as salvage therapy within 1 month of onset. That advice concerns hearing recovery; this page's negative conclusion applies to chronic tinnitus. In the UK, NICE says people with tinnitus and hearing loss that developed suddenly (over 3 days or less) in the past 30 days should be seen within 24 hours. This is not medical advice. Sources: AAO-HNSF sudden hearing loss guideline (2019) · NICE NG155 referral recommendations
Current evidence
Oxygen chambers are sold for tinnitus at hundreds of dollars a session; Cochrane says routine use 'cannot be justified'.
Evidence strength: Limited (2/5) · Tier 5 — weak or unsupported · Evidence independence: Primarily independent.
Breathing 100% oxygen at above-atmospheric pressure in a chamber; marketed by private hyperbaric clinics for tinnitus and sudden hearing loss.
Did tinnitus loudness or distress improve?
🧠 Did tinnitus distress improve?
None shown.
Same review: small, methodologically poor studies; routine use not justified.
Loudness means the tinnitus percept itself became quieter (psychoacoustic matching or loudness ratings). Distress means questionnaire scores such as THI/TFI, sleep, anxiety or quality of life improved — the sound may be unchanged. A THI/TFI improvement is never evidence the tinnitus got quieter.
How strong is the evidence?
Cochrane-reviewed and unsupported for chronic tinnitus: Tier 5.
What the studies found 1 tracked
Hyperbaric oxygen for idiopathic sudden hearing loss and tinnitus (Cochrane Review)
Bennett MH, et al. · Cochrane Database of Systematic Reviews · 2012 · N=392 (7 RCTs) · Systematic review
Studies small and methodologically poor; 'the significance of any improvement in tinnitus could not be assessed'; no benefit for chronic (>6-month) tinnitus; routine use cannot be justified.
What are the limitations?
- Cochrane: small, poor studies; benefit unassessable
- Sold off-label to desperate patients
Has the result been independently replicated?
None yet.
What should patients know about safety?
Safety evidence: Moderate. Barotrauma risk, temporary myopia, oxygen toxicity at extremes; plus significant cost.
Is it available?
Regulatory status: FDA-regulated chambers; tinnitus is NOT an approved indication.
Availability: Private clinics, $150–400/session · Europe: Same · Cost (approx.): $150–400/session, multi-session courses
Related treatments 4
- Acupuncture — The world's most-used complementary tinnitus treatment — low-quality trials say yes, higher-quality analysis…
- Low-level laser therapy / photobiomodulation — Home ear-lasers are sold online today; the meta-analysis found no significant benefit, and its authors say…
- Cannabis / CBD — 'CBD for tinnitus' is aggressively marketed. There are zero human trials — and population data point the…
- Hypnotherapy — Widely offered privately, often with confident claims — there is no evidence it works for tinnitus.
Evidence last reviewed: 2026-09-04 · Evidence included through: 2026-09-04 · Confidence: high. Open the interactive evidence profile · How we rate evidence.
This page summarizes published research for education. It is not medical advice; it cannot say what will work for any individual. Discuss treatment decisions with a qualified clinician.