6Autoimmune and Inflammatory Causes

FThe immune-privileged ear loses its privilege

The inner ear was long thought to be immunologically privileged, walled off from the body’s immune surveillance. We now know this privilege is incomplete: the endolymphatic sac and surrounding tissue can mount and receive immune responses, and when tolerance breaks down the cochlea can become the target of an autoimmune or inflammatory attack. The result is sensorineural hearing loss, often fluctuating, and tinnitus.

The hallmark that distinguishes this group from most other tinnitus is its tempo and its reversibility. Autoimmune inner-ear injury characteristically fluctuates and can progress over weeks to months — faster than presbycusis but slower than a sudden vascular event — and it may respond to immunosuppression. Recognising the pattern matters because the window for rescuing hearing and quietening tinnitus can be short [2013].

TAutoimmune inner ear disease

Autoimmune inner ear disease (AIED) is the prototype: rapidly progressive, often bilateral but asymmetric, sensorineural hearing loss with tinnitus and sometimes vestibular symptoms. It may be primary (confined to the ear) or secondary to a systemic autoimmune disorder. The diagnosis remains largely clinical because no single laboratory test is sensitive and specific; serological markers such as antinuclear antibody and antineutrophil cytoplasmic antibody support but do not confirm it [2009].

The defining clinical test is therapeutic. A response to a trial of high-dose corticosteroids is the traditional diagnostic hallmark of AIED, and many clinicians regard a steroid trial as both the first treatment and a confirmatory step. The practical lesson is to think of AIED whenever hearing fluctuates and to act before irreversible loss sets in.

TSystemic autoimmune disease and vasculitis

Tinnitus and SNHL can be the ear’s contribution to a systemic autoimmune disorder. Systemic lupus erythematosus, antiphospholipid syndrome (where microthrombosis injures the cochlear circulation), and the systemic vasculitides — including granulomatosis with polyangiitis and giant-cell arteritis — can all involve the inner ear. The unifying mechanisms are autoantibody and immune-complex deposition, vasculitic ischaemia and cytotoxic injury to the stria vascularis and organ of Corti.

Cogan syndrome deserves special mention because its combination of audiovestibular symptoms with interstitial keratitis is a near-pathognomonic pairing; a systematic review of audiovestibular outcomes confirms that hearing and balance involvement is central to the disease and that prompt immunosuppression influences outcome [2025]. Sarcoidosis, a granulomatous inflammatory disorder, can likewise cause sensorineural hearing loss and tinnitus, occasionally as the presenting feature [2022].

CSteroid-responsiveness as a clue and a treatment

The single most useful clinical signal across this group is steroid-responsiveness. Improvement in hearing or tinnitus after a course of high-dose corticosteroids both supports an immune-mediated mechanism and provides immediate benefit. Steroids may be given systemically or intratympanically when systemic therapy is contraindicated, the latter delivering high local concentrations with fewer systemic effects.

For steroid-dependent or steroid-refractory disease, disease-modifying antirheumatic drugs and biologic agents extend the therapeutic armamentarium. A systematic review and meta-analysis found that DMARDs can improve auditory and vestibular outcomes in AIED, and biologics such as anti-TNF and anti-IL-6 (tocilizumab) and rituximab have a growing role, particularly in Cogan syndrome and the vasculitides [2023].

CRecognising the pattern at the bedside

The clinician’s task is pattern recognition. Tinnitus with fluctuating or rapidly progressive bilateral SNHL, vertigo, or any systemic clue — arthralgia, rash, red eyes, sinonasal or constitutional symptoms — should raise the autoimmune flag. A focused work-up includes audiometry to document the tempo, inflammatory markers (ESR, CRP), autoantibodies (ANA, ANCA, antiphospholipid antibodies), and MRI to exclude retrocochlear pathology.

Above all, do not wait. The reason autoimmune and inflammatory causes are worth knowing is that they are among the few tinnitus causes where timely treatment can reverse the underlying disease and preserve hearing. A low threshold for an early steroid trial in the right pattern is the practical embodiment of that principle.