Interoceptive Sensitivity and Anxiety: Can People Who Feel Their Heartbeat More Easily Become More Anxious?

A person having a panic attack is intensely aware of their body: pounding heart, tight chest, tingling hands. The cognitive model of panic says it is the interpretation of these sensations, not the sensations themselves, that creates the spiral. But an adjacent question has generated its own research literature: do some people simply feel their body more acutely, and does that make them more vulnerable to anxiety?

The concept

Interoception is the perception of internal bodily signals — heartbeat, breathing, hunger, temperature, pain. Interoceptive sensitivity, in research terms, refers to how accurately a person can detect these signals. The idea that higher sensitivity might predispose to anxiety is intuitive: if you feel every heartbeat skip, every stomach churn, you have more raw material for catastrophic interpretation.

The concept gained prominence through cognitive models of panic disorder. If panic is a misinterpretation of bodily sensations, then people who detect those sensations more readily might be at higher risk. This reasoning led to decades of research using the heartbeat detection task as a proxy for interoceptive sensitivity [1].

The theoretical appeal is obvious. Cognitive models of panic already identified catastrophic misinterpretation of body sensations as the key mechanism. Adding interoceptive sensitivity to the model gave it a predisposing factor: some people, the argument went, have more sensitive bodies, and this greater sensitivity gives the catastrophic interpretation process more material to work with. The question that followed was whether this sensitivity could be measured and whether it really differed between anxious and non-anxious people.

How it is measured

The most common measure is the heartbeat detection task, which comes in two versions:

Heartbeat counting task. The participant sits quietly and tries to count their heartbeats over a set interval without taking their pulse. Their count is compared with an objective measure (typically ECG). Accuracy is calculated as the discrepancy between counted and actual beats.

Heartbeat discrimination task. External tones are presented, and the participant judges whether each tone is synchronous or asynchronous with their heartbeat. This requires discriminating timing rather than counting.

Both versions share a practical limitation: they assume the participant is trying to be accurate. A person who believes their heart races constantly may report high counts not because they feel each beat but because they expect a high number. This is one reason the distinction between measured accuracy and self-reported beliefs (discussed below) turned out to be important.

Early studies using these tasks in panic disorder found promising results. Ehlers and Breuer reported that people with panic disorder detected their heartbeats more accurately than controls, with particularly good performance during stress [5]. These findings seemed to close the loop: panic patients are better at detecting bodily signals, they interpret those signals catastrophically, and this combination produces panic attacks.

What meta-analyses show

The initial findings were encouraging, but as studies accumulated, the picture became less clear. The association between interoceptive accuracy and anxiety is smaller than early studies suggested and varies substantially across studies.

A critical meta-analysis of the heartbeat counting task questioned whether the task measures interoception at all. The analysis found that heartbeat counting scores correlated more strongly with resting heart rate and body mass index than with measures that should relate to interoceptive ability. The authors concluded that the task “largely measures non-interoceptive processes” [4].

This is a measurement problem with wide implications. If the primary tool used to measure interoceptive sensitivity in anxiety research does not validly measure interoception, then the entire evidence base linking interoception to anxiety is less secure than it appears.

The problem is not merely academic. Hundreds of studies have used heartbeat counting as their primary measure of interoception, and their conclusions rest on the assumption that the task captures something about perceptual ability. If it primarily captures something about body size, resting physiology and guessing strategy, then findings of group differences between anxious and non-anxious people may be artifacts of those confounds rather than evidence of a genuine perceptual difference.

Three dimensions, not one

Garfinkel and colleagues proposed that what researchers call “interoception” is actually at least three separate things [3]:

1. Interoceptive accuracy: objective performance on a detection task (can you actually feel your heartbeat?)
2. Interoceptive sensibility: self-reported beliefs about your ability to perceive bodily signals (do you think you are good at feeling your heartbeat?)
3. Interoceptive awareness: the correspondence between accuracy and sensibility (do you know how good you actually are?)

This distinction matters because the relationship with anxiety may differ across dimensions. People with anxiety often score high on interoceptive sensibility — they believe they are highly attuned to their body — even when their objective accuracy is average. The mismatch between belief and reality may be more relevant to anxiety than accuracy alone.

Consider what this means in practice. A person with panic disorder might say, with genuine conviction, “I can always feel when my heart is doing something wrong.” When tested, their heartbeat detection accuracy might be average. But their belief in their own sensitivity keeps them vigilant, scanning for cardiac signals, interpreting ambiguous sensations as abnormal, and responding with fear. It is the belief, not the ability, that feeds the anxiety cycle. This aligns with cognitive models, which have always emphasized interpretation over raw perception.

What the evidence supports and what it does not

Supported: People with anxiety disorders, particularly panic disorder, tend to report greater awareness of and attention to bodily sensations. Self-reported interoceptive sensibility is consistently elevated in anxiety.

Less clear: Whether objectively measured interoceptive accuracy (actual heartbeat detection) is truly elevated in anxiety. The evidence is mixed once you account for measurement problems.

Unsupported: A simple causal story in which better interoception causes anxiety. Cross-sectional studies cannot establish direction, and the measurement tools are not reliable enough to anchor strong causal claims.

Open: Whether interoceptive training or desensitization could treat anxiety. Some interventions (interoceptive exposure, body-scan meditation) target body awareness, but it is unclear whether they work by changing interoceptive accuracy, changing interpretation, or something else entirely [6].

The clinical implications of this uncertainty are worth spelling out. Interoceptive exposure — deliberately inducing body sensations like rapid heartbeat or dizziness — is already a standard component of CBT for panic disorder, and it works. But it probably works by updating the catastrophic interpretation (the sensation is not dangerous) rather than by recalibrating interoceptive accuracy. If that is the case, then the therapeutic mechanism is cognitive, not perceptual, and the interoceptive sensitivity framework adds less to treatment than it might first appear.

The attention-versus-accuracy question

A neuroimaging review proposed that anxiety may be characterized not by better interoception but by a mismatch between expected and actual bodily signals — a kind of prediction error that the brain interprets as threat [6]. Under this model, anxious people don’t feel their body more accurately; they attend to it more, expect danger, and interpret normal variation as abnormal.

This reframing matters. If the problem is attention and interpretation rather than raw sensitivity, then interventions targeting catastrophic beliefs (as standard CBT does) may be more relevant than interventions targeting perceptual ability.

The roadmap

A roadmap paper published in 2018 acknowledged the state of the field frankly: the evidence linking interoception to mental health is promising but fragmented, measurement tools need improvement, and mechanistic understanding is limited [2]. The paper called for standardized tasks, longitudinal designs and experimental manipulations of interoceptive signals.

As of now, those calls have been partially answered. New tasks are being developed, but none has replaced the heartbeat detection paradigm as a standard. Longitudinal data remain scarce. The field is in an unusual position: a concept (interoceptive sensitivity) that is widely discussed, frequently cited in clinical literature, and theoretically appealing, but whose empirical foundation rests on a measurement tool that may not measure what it claims. This does not mean the concept is wrong — it means the evidence is weaker than the confidence with which it is often presented.

The broader lesson is familiar in anxiety research: an elegant theory can outrun its evidence, and once a finding becomes part of clinical lore, it can be difficult to update even when the data shift. The original story — anxious people feel their body more, and this makes them anxious — has a compelling simplicity. The actual picture, involving uncertain measures, multiple dimensions, and unclear causal direction, is messier but more honest.

What this means for reading research

When you see a study claiming to measure “interoceptive sensitivity”:

1. Check which task was used. Heartbeat counting, heartbeat discrimination and self-report measure different things.
2. Ask whether the results survive controlling for heart rate and body composition, which affect counting task performance.
3. Distinguish between the three dimensions: accuracy, sensibility and awareness.
4. Note the sample: results from panic disorder may not generalize to other anxiety conditions.

For a broader look at what anxiety measures capture and miss, see what does an anxiety study measure?.

When to look for more support. If you are highly aware of your heartbeat, breathing or other body sensations and this awareness causes you significant distress, talk to a doctor. Heightened body awareness alone is not a disorder, but it can be part of conditions like panic disorder or health anxiety that respond well to treatment. If you are in crisis, call or text 988 (US) or contact Samaritans on 116 123 (UK and Ireland).