6The Hard Cases: When Tinnitus Persists or Worsens

CThe shape of the problem: persistence, worsening, new onset

Three distinct unfavourable outcomes exist: tinnitus that persists unchanged, pre-existing tinnitus that is aggravated, and entirely new-onset tinnitus in an ear that was previously quiet. Database and review figures put new-onset (induction) at roughly 9% of recipients with paired data, with substantial worsening uncommon (around 1-2%), though ranges across studies are wide. Persistence is the most common 'failure' — in some prospective cohorts tinnitus remained in the majority even when handicap scores fell, so 'still present' is not the same as 'no benefit'. When new tinnitus does appear it is more often mild than incapacitating, but it can be distressing precisely because it was unexpected.[2022][2019][2015]

TWhy it happens: surgical, electrode, and central contributors

Surgery itself deafferents: insertion trauma, loss of any residual hearing, and added cochlear damage can generate or worsen the maladaptive central gain that drives tinnitus. Electrode and mapping factors — array position, an aberrantly stimulating electrode, or a poorly balanced map — can produce stimulation-related or new percepts that present as tinnitus. Central and psychological factors weigh heavily: pre-existing anxiety, depression, catastrophising, and high baseline distress predict worse tinnitus trajectories and limited benefit. Counter-intuitively, recipients with low preoperative tinnitus and low hearing handicap are among those most likely to feel worse off, because they had less to gain and a quiet baseline to disturb. (Device-failure and electrode-malposition workup is detailed in Complications.)[2019][2022][2024]

CAnticipating and counselling for the risk

Explicitly counsel before surgery that a small minority have unchanged, worse, or new tinnitus — naming it converts a later complaint from a surprise into a discussed, accepted risk. Be especially careful with the low-handicap, low-tinnitus candidate and with patients showing major psychological distress, where the benefit-to-risk balance is least favourable. Avoid promising tinnitus relief as a reason to implant in anyone whose hearing indication is borderline. Set the time-frame: early postoperative tinnitus can settle over weeks to months as the brain adapts and the map matures, so immediate reassurance and review beat early intervention.[2019][2015][2022]

CManaging it when it happens

Start with the map: re-programming to remove or rebalance an offending electrode, adjust levels, or change stimulation can resolve stimulation-related percepts. Layer in tinnitus-specific therapy — sound therapy/enrichment using the processor, masking, and cognitive behavioural therapy, which targets the distress even when the percept persists. Allow time: the brain continues to adapt, and a stepwise ladder (reassurance and time → mapping changes → sound therapy → CBT → specialist tinnitus referral) avoids over-treating a self-limiting problem. Be honest about uncertainty — we cannot reliably predict who will worsen, so management is reactive, individualised, and patient.[2022][2024][2019]