Definitional uncertainty has practical effects, ranging from overestimating or underestimating the scale of the problem to misguiding resource allocation, policy development, and even undermining the credibility of epidemiological findings. Reported prevalence rates vary from 5 percent to 37 percent, largely because surveys rely on inconsistent definitions of tinnitus (Jarach et al., 2022). A coherent definition is therefore essential for producing more reliable prevalence estimates and for ensuring that survey items are interpreted consistently by participants.

A further complication arises from the frequent conflation of descriptions with definitions. Descriptions of tinnitus as buzzing, hissing, or ringing illustrate particular phenomenological presentations, but they do not identify the conceptual features that make tinnitus what it is. Descriptions or examples tell us how tinnitus appears in specific cases; a definition aims to identify the necessary and sufficient conditions that would apply to all cases of tinnitus and to tinnitus alone. This distinction echoes a classical philosophical challenge. In Plato's Meno (380 BCE), Socrates asks Meno to say what virtue is (Scott, 2006). Meno replies by listing different forms of virtuous behavior, such as the virtue of a man, a woman, a soldier, or a ruler. Socrates rejects these, insisting that they are merely examples of virtue and that what is needed instead is a definition of what virtue itself is. A definition, he argues, must specify what all instances of virtue have in common and what belongs to virtue alone. Similar exchanges occur when Socrates asks Cephalus and Polemarchus to define justice in Plato's Republic (380 BCE) (Plato, 1993). Because this paper is concerned with definition rather than description, distinguishing these tasks is critical for conceptual clarity.

It is necessary to distinguish the definition of tinnitus itself from the meanings individuals may attribute to it, and from the distress it may cause, since not everyone who experiences tinnitus is distressed by it (Davis and Refaie, 2000). Distress is understood here as the impact of tinnitus on mood or its interference with day-to-day activities such as work, daily tasks, leisure, rest, and sleep (Aazh et al., 2024). These dimensions are clinically and ethically significant and are central to the concept of tinnitus disorder, in which distress and functional impairment are defining features (De Ridder et al., 2021). They do not, however, belong to the definition of tinnitus as such. This paper therefore treats tinnitus as an experience that may exist in the absence of distress, while recognizing that tinnitus and distress can become strongly mutually reinforcing and together constitute a distinct focus for clinical and empirical investigation.

A simple analogy may help to clarify this distinction. When a person touches a hot object, there is an immediate sensory experience commonly described as burning. This experience has a particular qualitative character, intensity, and bodily localization, and it is recognized directly in consciousness before any interpretation occurs. Questions such as whether this sensation constitutes pain, what kind of pain it is, or what neural processes underlie it are matters for further investigation, but the experience itself can be distinguished from the meanings and reactions that follow. These may include thoughts such as “I should have been more careful,” emotional responses such as fear or upset, and behavioral consequences such as seeking medical attention or withdrawing from activity. While these responses are important and may amplify, prolong, or otherwise modulate the overall experience, they are not part of what the burning sensation itself is; they are responses to it. In an analogous way, this paper distinguishes tinnitus as a direct experiential phenomenon from the distress it may evoke.

In practice, however, this analytic separation is rarely experienced so cleanly. Individuals who experience tinnitus are likely to conflate the perceptual phenomenon itself with the psychological and behavioral processes through which it is interpreted and managed. For patients, the sound, its meanings, and its consequences are lived as a unified experience rather than as analytically separable components. This experiential fusion is understandable and clinically important. The present paper, however, adopts a more foundational task: to clarify what tinnitus itself refers to prior to the emergence of distress. This distinction matters for research and communication alike. If tinnitus and its consequences are not clearly separated, neuroimaging and biomarker studies risk identifying correlates of anxiety, threat, or attentional salience and attributing these findings to tinnitus per se. Likewise, defining tinnitus as inherently distressing may unintentionally reinforce the belief that its mere presence entails inevitable suffering, a message that can amplify fear and maladaptive appraisal. Treating tinnitus as analytically prior to distress therefore does not minimize the latter's importance; rather, it preserves conceptual clarity and allows more precise investigation of how and why tinnitus becomes a disorder for some individuals while remaining a benign perceptual experience for others.

It is important to acknowledge that the Socratic demand for a definition that captures what is shared by all instances of a phenomenon and belongs to nothing else may not be satisfiable for tinnitus. Socrates himself repeatedly encountered this limitation when attempting to define complex human phenomena such as justice, virtue, or piety, succeeding more readily with formal entities than with lived experience. The value of the Socratic method in such cases lies not in the production of a final definition, but in the questions it generates and the assumptions it exposes. Applied to tinnitus, the method functions less as a means of producing a final definition than as a way of identifying where and why attempts to define tinnitus encounter conceptual limits.

Is tinnitus best understood as a form of perception, and more specifically as the perception of sound? This question remains unresolved and has important implications for how tinnitus is defined and studied. In everyday language, patients rarely describe tinnitus by saying, “I perceive a sound.” Instead, they commonly say, “There is a noise in my head,” or “When I go into a quiet room, it is there.” Noreña (2023) proposes that tinnitus, like chronic pain, may be felt rather than perceived, arising within consciousness without being directed toward an external source. These observations raise a broader conceptual question: do the ordinary linguistic categories used for auditory perception adequately capture tinnitus, or is tinnitus described as a sound primarily because language offers no more precise vocabulary for this kind of internal experience?

In philosophical and cognitive science terminology, perception is typically understood as an object-directed sensory representation, such as seeing an object or hearing a sound in the external world. By contrast, states such as hunger, pain, and bodily tension are classified as interoceptive, nociceptive, and proprioceptive experiences, respectively. These are internal phenomenal events that do not represent external objects. Whether tinnitus belongs to category of experience, despite its auditory resemblance, remains an open question. It is plausible that tinnitus is experienced as an immediate internal event rather than as an auditory perception in the strict philosophical sense, particularly insofar as it lacks an external object and does not function as a representation of the environment. Some accounts further suggest that tinnitus may reflect a phenomenal response to missing or degraded sensory input, especially in the context of hearing loss, where neural activity arises in the absence of an expected external signal (Salvi et al., 1990). However, these interpretations remain hypotheses rather than settled conclusions.

Importantly, the claim that tinnitus is not object-directed does not imply that it is unaffected by the environment. Environmental sounds, contexts, or situations may exacerbate tinnitus through attentional capture, threat appraisal, conditioning, or memory, particularly in cases linked to traumatic experience. In such instances, tinnitus may become strongly associated with external cues without thereby functioning as a perceptual representation of those cues. The experience is modulated by the environment, but it is not, in this sense, a perception of the environment itself.

The sound-like quality of tinnitus complicates this issue. Many individuals can produce an approximate acoustic match during pitch or loudness matching procedures, indicating that tinnitus shares certain perceptual features with sound. At the same time, such matches are often unstable and inconsistent, and they lack the precision and reliability of ordinary auditory thresholds. Moreover, psychoacoustic properties explain only a small proportion of the variance in tinnitus-related distress, indicating that tinnitus-related distress cannot be fully accounted for by loudness or pitch alone. When asked to describe their tinnitus, many individuals hesitate, and approximately one in five report being unable to describe it at all (Aazh et al., 2008). Others rely on metaphors such as static, a television switching off, or a waterfall, often acknowledging that these descriptions are approximations rather than literal accounts. Still others describe tinnitus not as a sound at all, but as pressure, vibration, tension, or a “feeling in the ear.” These descriptions point to an experience that may be auditory-like without being straightforwardly auditory.

Such linguistic substitutions highlight the limits of ordinary language in capturing the phenomenology of tinnitus. A waterfall, for example, is not only heard but also felt as vibration, spatial presence, and bodily immersion. Tinnitus may share this diffuse, enveloping, and sometimes bodily quality, which challenges attempts to classify it as a simple auditory percept. The fact that “sound” remains the most commonly used descriptor may therefore reflect linguistic convenience rather than phenomenological accuracy.

Taken together, these observations suggest the need for systematic research examining whether tinnitus should be understood as sound, as a sound-like experience, or as a distinct category of internal sensation that is described in auditory terms by analogy. Rather than presupposing an answer, definitions of tinnitus should remain open to the possibility that “sound-like” is a provisional descriptor, marking an unresolved question about the nature of the experience itself.

An important empirical dimension of this question concerns how individuals themselves understand and categorize their tinnitus experience. It remains unclear what proportion of people who report tinnitus experience it primarily as a sound, and what proportion experience it as something else, such as pressure, vibration, tension, bodily sensation, or an indistinct internal presence that resists straightforward auditory classification. Current research rarely examines this distinction directly, often presupposing that tinnitus is a sound and structuring questionnaires and clinical interviews accordingly. As a result, the apparent centrality of “sound” in tinnitus descriptions may reflect methodological and linguistic constraints rather than the phenomenology of the experience itself. Future research should therefore investigate how individuals categorize their tinnitus in their own terms, whether these experiential categories vary across individuals, or contexts, and whether a more appropriate experiential taxonomy can be developed. Such work could examine whether different categories correspond to distinct perceptual, attentional, or physiological profiles, thereby informing both definition and classification.

For how long must an experience persist for it to count as tinnitus? How can persistence be established if the individual is not aware of the experience? Does temporality itself constitute an ontological feature of tinnitus, or does awareness of persistence over time function instead as an epistemic gateway through which tinnitus becomes knowable? These questions highlight the difficulty of grounding the definition of tinnitus in duration alone. A fleeting squeak or hum lasting only seconds, or even a minute or two, is generally regarded as too brief to qualify as tinnitus. The experience must persist long enough to be noticed, remembered, and distinguished from momentary auditory artifacts or transient internal sensations. Tyler et al. (1992) proposed that tinnitus should last at least 5 min and occur more than once a week, representing an early attempt to operationalise this temporal requirement.

Building on this approach, Henry (2026) distinguishes several forms of ear or head noise based on duration and recurrence. These include transient ear noise, such as a sudden tone in one ear often accompanied by a sensation of ear fullness or temporary hearing change that resolves within minutes; temporary ear noise, which may follow exposure to loud sound, medication use, or medical conditions and typically resolves within days or weeks; and occasional ear noise, defined as ear or head noise lasting at least 5 min but occurring less than weekly. These are contrasted with intermittent tinnitus, in which the noise lasts at least 5 min and occurs at least weekly, and constant tinnitus, which can be perceived whenever the environment is sufficiently quiet. Such distinctions provide useful clinical and research benchmarks for separating fleeting phenomena from more stable experiences.

However, these temporal thresholds remain, to some extent, arbitrary. Most individuals cannot reliably discriminate between, for example, 4 and 5 min. It is plausible that a sound-like experience may persist without being consciously noticed or subsequently recalled, rendering it epistemically inaccessible even if it is present at the level of experience. In this sense, duration may describe not only how long an experience lasts, but also the conditions under which it becomes salient enough to enter awareness and to be identified as something distinct. The point at which an experience is no longer fleeting may therefore depend less on objective time than on its stability, recurrence, or experiential continuity. For this reason, the working definition adopted in this paper refers to tinnitus as an experience that persists for more than fleeting moments, rather than specifying a fixed temporal threshold. This formulation acknowledges the importance of persistence while remaining agnostic about precise durations, which are likely to vary across individuals and contexts.

Future research should examine how persistence is experienced and recognized, whether duration, recurrence, or continuity are most relevant for tinnitus identification, and how these temporal features interact with attention and awareness. Clarifying these issues is necessary before persistence can be treated as a stable definitional criterion rather than a provisional marker of epistemic access.

Temporal persistence alone does not fully explain how a sound-like internal experience becomes tinnitus. As discussed above, duration allows an experience to be distinguished from fleeting or incidental phenomena, but persistence by itself does not guarantee conscious recognition. Many internal experiences may persist without being noticed, remembered, or classified as anything in particular. An additional factor therefore appears to be involved in explaining why some persistent sound-like experiences enter awareness and stabilize as tinnitus, while others remain part of unremarked physiological background activity.

One candidate factor is affective salience. This raises a central question: does tinnitus involve some degree of intrinsic unpleasantness, or is it ontologically possible for tinnitus to be entirely neutral or even pleasant? More broadly, what renders tinnitus experientially salient in the first place? Experiences tend to enter awareness not merely because they persist, but because they matter, at least minimally, to the individual. Internal sensations that are entirely neutral in valence are often filtered from consciousness and remain unclassified. By contrast, sensations that carry some degree of affective charge are more likely to be noticed, differentiated, and remembered. This principle is familiar from bodily experience more generally. Pain, itch, or discomfort may vary widely in intensity and consequence, yet all involve some degree of unpleasantness that contributes to their experiential salience. Importantly, unpleasant sensation must be distinguished from suffering. In pain phenomenology, and in Buddhist analyses in particular, unpleasant sensation and suffering are not equivalent. Suffering arises through cognitive appraisal, emotional elaboration, and meaning-making in response to an unpleasant sensation, rather than from the sensation alone. Cognitive appraisal does not operate on affectively neutral experiences; it elaborates upon experiences that already carry some degree of aversive tone. In this sense, unpleasantness may function as a precondition for suffering without being equivalent to it. Whether a similar distinction applies to tinnitus remains an open empirical and conceptual question.

Several possibilities therefore require investigation. It may be that only a subtype of tinnitus involves intrinsic unpleasantness, and that suffering arises primarily within this subgroup, while other tinnitus experiences differ qualitatively in their sensory or affective character. Alternatively, it may be that all tinnitus experiences involve some minimal degree of unpleasantness at the level of immediate sensation, and that differences in suffering arise predominantly through cognitive, emotional, and contextual processes rather than through differences in the tinnitus experience itself. A third possibility is that unpleasantness is neither uniform nor categorical, but varies along multiple dimensions related to the qualitative properties of the tinnitus experience and the individual's broader sensory sensitivities.

Descriptions offered by individuals with tinnitus suggest that the experience often resembles sounds that are commonly regarded as unsettling or intrusive, such as distorted static, throbbing, screeching, or mechanical noises. Such sounds are frequently associated with malfunction, danger, or bodily intrusion, for example a broken machine, an alarm, or an instrument out of tune. Some tinnitus experiences resemble bodily sounds, such as heartbeats or internal pulsations, which may themselves be experienced as unsettling. Literary examples have long drawn on such sound qualities to evoke unease or disturbance. In Portrait of a Lady, T. S. Eliot describes a “dull tom-tom” hammering in the brain and a false note from cracked cornets (Eliot, 1915). In The Divine Comedy, Dante Alighieri depicts thunder rolling within the head and ears pierced by cries of pain (Kirkpatrick, 2004). In Romeo and Juliet, William Shakespeare contrasts the shrieking of mandrakes torn from the earth with the “silver-sweet” sound of a beloved voice (Shakespeare, 1597). These examples do not define tinnitus, but they illustrate a longstanding cultural recognition that certain sound qualities are experienced as intrinsically unpleasant.

At the same time, unpleasantness should not be understood as a categorical or universal property, analogous to a Kantian categorical imperative (Kant, 1790/2000). While many individuals may share broad similarities in the types of sound qualities that are experienced as unpleasant, substantial individual differences are likely. These differences may be shaped by sensory sensitivity, including conditions such as hyperacusis, and misophonia, as well as by learning history, context, and personal associations. A sound quality that is experienced as sharply unpleasant by one individual may be experienced as neutral, or mildly unpleasant by another. Unpleasantness, if it plays a role in tinnitus recognition, is therefore unlikely to be all-or-none and may instead reflect graded and multidimensional affective responses to the qualitative features of the experience. Importantly, in this context, such differences pertain to how the immediate qualitative features of the tinnitus experience are registered, rather than to the cognitive, emotional, or behavioral processes that may follow and give rise to distress or disruption in daily life.

Taken together, these considerations suggest that what has been described here as “necessary unpleasantness” should be treated as a working hypothesis rather than a settled definitional criterion. The hypothesis is not that tinnitus must be distressing but that some degree of affective salience at the level of immediate sensory experience may contribute to whether a persistent sound-like phenomenon becomes noticed, recognized, and stabilized as tinnitus. This affective salience may be graded, variable, and context-sensitive, and may fluctuate with physiological and psychological states such as fatigue, stress, or arousal, without thereby being reducible to suffering or distress. Future research should therefore examine whether tinnitus experiences differ systematically in their immediate affective qualities, which specific sensory characteristics are associated with aversive or salient responses, how individual differences and moment-to-moment states shape these responses, and whether unpleasantness is a prerequisite for tinnitus recognition or merely one common pathway among several.

How is tinnitus different from auditory hallucinations, involuntary musical imagery, or the sounds experienced during dreaming, given that all may occur without an external acoustic source? Traditionally, the distinction has been drawn not simply on the absence of external stimulation, but on differences in the mode of consciousness and the structure of meaning involved. Tinnitus is commonly understood to occur in wakeful consciousness and to lack intrinsic semantic or representational content. By contrast, dream sounds, hypnagogic imagery, and auditory hallucinations typically arise in altered states of consciousness or involve recognizable voices, melodies, words, or symbolic content.

However, whether tinnitus is strictly confined to wakeful consciousness warrants closer scrutiny. In a preliminary study examining the perception of tinnitus during dreams, Aazh et al. (2021) found that a small proportion of patients seeking help for tinnitus or hyperacusis (5%) reported perceiving tinnitus in their dreams. Importantly, those who reported tinnitus in dreams had greater perceived impact on life. These findings suggest that, while uncommon, tinnitus-like experiences may intrude into dreaming in individuals for whom tinnitus is particularly distressing. This does not imply that tinnitus is ordinarily a dream phenomenon, but it indicates that the boundary between wakeful and non-wakeful experience may be more permeable under certain conditions.

A related challenge to a strictly non-semantic account of tinnitus arises in the context of trauma. Studies of trauma-exposed populations, such as refugees, have shown a strong association between tinnitus and post-traumatic stress disorder (PTSD) severity (Hinton et al., 2006). In this context, tinnitus may become tightly linked to traumatic memories, catastrophic interpretations, and culturally shaped threat associations. Importantly, Hinton and colleagues demonstrated that tinnitus-related trauma associations and catastrophic cognitions mediated the relationship between tinnitus severity and PTSD symptoms. This suggests that while tinnitus itself may lack intrinsic semantic content, it can become deeply embedded within networks of meaning, memory, and threat appraisal, particularly following traumatic experiences.

These findings highlight the importance of distinguishing between the immediate experiential character of tinnitus and the meanings that may become associated with it over time. Even in trauma-related tinnitus, the sound-like experience does not inherently represent a thought, message, or narrative. Rather, semantic and emotional significance appears to arise through associative learning, memory activation, and cognitive appraisal processes that operate on the experience. In this respect, tinnitus differs from auditory hallucinations involving voices or commands, where semantic content is intrinsic to the percept itself.

Taken together, these observations suggest that wakefulness and non-semantic character are best understood not as absolute criteria, but as default properties of tinnitus that admit important exceptions under specific psychological or neurocognitive conditions. The existence of tinnitus-like experiences during dreaming, and the embedding of tinnitus within trauma-related meaning systems, does not invalidate the conceptual distinction between tinnitus and other auditory phenomena. Instead, these cases help clarify where the boundaries of tinnitus lie and where further empirical work is needed.

Accordingly, the working definition proposed in this paper treats tinnitus as a predominantly wakeful, non-semantic, sound-like experience, while remaining open to the possibility that these characteristics may vary in atypical cases or under conditions of heightened salience, distress, or trauma. Rather than excluding such cases, the definition highlights them as critical areas for future research, necessary for determining whether wakefulness and non-semantic character are necessary features of tinnitus or merely common ones.