Hyperbaric oxygen therapy (HBOT) for Tinnitus: What Does the Evidence Show?

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 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.

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.

Has the result been independently replicated?

None yet.

What are the limitations?

• Cochrane: small, poor studies; benefit unassessable
• Sold off-label to desperate patients

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

What the studies found

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