6TRT Categories and the Treatment Protocol

FWhy categorise at all

Not every patient needs the same treatment. A person with intrusive tinnitus but normal hearing and no sound sensitivity needs something different from a person whose dominant problem is that everyday sounds feel painfully loud. Jastreboff and Jastreboff distilled these differences into five categories, numbered 0 to 4, each with a recommended treatment package [2000].

The categories are not a severity score in the usual sense; they classify the problem profile — whether hearing loss, hyperacusis, or prolonged sound-induced worsening dominates — so that counselling and sound therapy can be matched to what the patient actually needs [2013].

TThe four discriminating features

Category assignment rests on four clinical features: (1) the impact / severity of the tinnitus, (2) the presence of subjectively significant hearing loss, (3) the presence of hyperacusis (reduced tolerance to ordinary sound levels), and (4) whether the patient experiences prolonged exacerbation of symptoms after sound exposure — a feature that flags caution and changes how sound therapy is introduced [2000].

These features map onto the model: hearing loss argues for amplification, hyperacusis argues for graded sound desensitisation rather than aggressive enrichment, and prolonged sound-induced exacerbation warns that sound must be introduced slowly to avoid worsening the conditioned aversion [1993].

CThe categories and their matched protocols

In the standard scheme: Category 0 — low impact, no significant hearing loss or hyperacusis — needs mainly abbreviated counselling and reassurance. Category 1 — significant tinnitus impact without troublesome hearing loss or hyperacusis — receives full counselling plus wearable sound generators set toward the mixing point [2000].

Category 2 — tinnitus with subjectively significant hearing loss — receives counselling plus hearing aids (often combination devices) to restore input. Category 3 — hyperacusis is the dominant problem — receives counselling plus sound generators used for graded desensitisation at gradually increasing levels. Category 4 — prolonged sound-induced exacerbation — is the most cautious track, with very slow, carefully titrated sound introduction to avoid flare-ups [2013].

CStructured follow-up

The protocol is not a one-off prescription. Patients are reviewed at structured intervals so that category assignment, device settings, and counselling can be adjusted as the picture evolves — for example as hyperacusis improves and the patient migrates toward a less cautious track. Follow-up also sustains adherence, which is the practical determinant of success [2006].

The large Tinnitus Retraining Therapy Trial built its design around this structured, protocolised delivery, underscoring that the benefit attributed to TRT depends on faithful, scheduled implementation rather than ad-hoc advice [2019].

CEvidence and honest limits

Controlled studies support TRT’s efficacy: Bauer and Brozoski demonstrated in a controlled trial that TRT reduced the loudness and annoyance of chronic tinnitus, and the masking-versus-TRT trial likewise showed meaningful benefit [2011].

That said, the categorised protocol is resource-intensive and slow, and the TRTT’s findings tempered earlier enthusiasm by showing that the added sound-generator component did not always outperform well-delivered counselling-led standard care [2019]. Clinical guidelines therefore recommend TRT and sound therapy with appropriately measured expectations [2014].