Interoception

1. What interoception actually is

Interoception is the neurological process by which the brain receives, interprets, and represents signals from the internal body. It’s how you know your heart is racing, your stomach is full, your bladder is approaching the urge threshold, you’re cold, you’re tired, you’re anxious. The signals travel from internal organs and tissues through the vagus nerve and other ascending pathways to brain regions specialised for body awareness — particularly the insular cortex, anterior cingulate cortex, and somatosensory cortex.

Most of this processing runs below conscious awareness. The body is constantly producing internal signals and the brain is constantly integrating them; only a fraction reaches conscious attention. The interoceptive awareness layer is what surfaces when you deliberately attend to internal states, when intense signals demand attention (sharp pain, severe hunger, panic), or when emotional states produce strong somatic markers.

The term “interoception” itself was coined in the early 20th century by physiologist Charles Sherrington but remained obscure for decades. The current interest dates from the 2000s, when neuroscientist Bud Craig published influential papers on the neural basis of interoception. Antonio Damasio’s work on somatic markers and emotion connected interoception to emotional theory. Since 2010, interoception has become central to autism research, alexithymia research, trauma research, and embodied cognition theory.

The practical importance: interoception is the substrate of emotional awareness, body regulation, and self-knowledge. When it runs differently from the typical, the downstream effects on emotional regulation, body care, and identity are substantial.

2. The eighth sense

Most popular education teaches five senses: sight, hearing, touch, taste, smell. The current sensory-processing literature recognises eight, with the additional three being:

• Proprioception. Body position sense — where your limbs are, what muscles are doing, joint angle. Allows you to know your hand is raised even with eyes closed.
• Vestibular sense. Movement and balance, registered by the inner ear. Tells you when you’re upside down, accelerating, or rotating.
• Interoception. Internal body sense. The eighth sense.

Of the three additional senses, interoception is the one most often missing from popular awareness and yet possibly the most consequential. Proprioception and vestibular sense affect motor coordination; interoception affects emotional life, body regulation, and overall functioning.

Calling interoception “the eighth sense” is useful because it positions it alongside other senses that can be calibrated differently, can be impaired, can be developed through practice, and can be accommodated in environment design. Like vision or hearing, interoception runs differently for different people; like vision or hearing, the differences matter and accommodations help.

3. What interoception reads

The categories of internal signal interoception monitors:

• Cardiovascular. Heart rate, blood pressure, blood flow.
• Respiratory. Breathing rate and depth, oxygen levels (indirectly).
• Gastrointestinal. Hunger, satiety, gastric motility, nausea, bowel sensations.
• Urinary. Bladder fullness, urge to urinate.
• Thermal. Internal temperature, sensations of hot and cold.
• Pain. Internal pain, organ pain, headache.
• Muscle tension. Where muscles are tight or relaxed.
• Fatigue. Tiredness, energy levels.
• Emotional somatic markers. The body sensations associated with emotional states — chest tightness for anxiety, throat tightness for grief, heat for anger, warmth for joy.
• Arousal. Sexual arousal, alertness, drowsiness.
• Skin sensations. Internal aspects of touch — tickle, itch, sensations from within (vs external touch which is exteroception).

Each category can be more or less precisely registered. A person can have accurate cardiovascular interoception (knows their heart is racing) but poor gut interoception (doesn’t notice hunger). The profile is individual.

4. Interoception in autism

Autistic interoception often runs differently from the neurotypical baseline. Two main patterns:

Under-aware interoception. The signals are present but the awareness layer doesn’t register them clearly. Many autistic adults report:

• Not noticing hunger until tearful and crashing
• Forgetting to drink water for hours, recognising thirst only when headache arrives
• Late or inconsistent toilet awareness
• Not noticing being injured until much later
• Difficulty identifying emotional states in the body
• Getting sick before noticing they were stressed
• Sudden overwhelming emotion without warning signs being read
• Temperature regulation problems — not noticing cold or heat until it’s severe

Over-aware interoception with distortion. The signals are too loud or distorted, producing health anxiety, sensory overload, or panic. Some autistic adults report:

• Constant awareness of heart rate, sometimes producing health anxiety
• Gut sensations registering as distressing
• Breath awareness that produces dysregulated breathing
• Sensitivity to internal sensations that other people don’t notice at all

The two patterns often co-occur in the same person across different signal types. The autistic interoceptive profile is individual and worth mapping.

The autism-interoception link has been substantially documented in research over the past decade. Estimates suggest autism produces measurable interoception differences in most autistic individuals when carefully assessed. The differences affect emotional regulation, body self-care, sensory overload, and burnout vulnerability.

5. Interoception in ADHD

ADHD interoception runs differently from the typical too, though through a different mechanism. The ADHD pattern is usually attention-driven rather than calibration-driven:

• The interoceptive signals are present and accurate but attention doesn’t stay on them long enough to process
• Hunger, thirst, toilet needs, fatigue all get crowded out by whatever has captured attention
• Hyperfocus particularly produces complete interoceptive disconnection — hours pass with the body in significant deficit before the signal breaks through
• Dopamine-seeking can override interoceptive signals (eating past full, working past exhaustion)
• RSD spikes can produce intense somatic experience that confuses interpretation

The ADHD interoceptive issue is more about attention allocation than signal precision. Interventions that work for autism interoception (deliberate attention practice, structured body checks) also help ADHD interoception, with the additional benefit of medication if ADHD is being treated — medication often substantially improves the attention-to-body link.

AuDHD adults often have both patterns simultaneously — the autism-driven precision differences plus the ADHD-driven attention drift. Recovery work needs to address both layers.

6. The alexithymia connection

Alexithymia — difficulty identifying and describing one’s own emotions — is the most-documented downstream consequence of interoceptive differences. The current leading model:

Emotions are partly somatic. Fear involves racing heart and chest tightness; sadness involves throat tightness and heaviness; anger involves heat and jaw tension; joy involves warmth and lightness. Reading those somatic signals and labeling them produces the conscious experience of emotional awareness.

When interoception runs with reduced precision, the somatic signals aren’t getting cleanly read. The emotional labeling system has poor signal to work with. The result is alexithymia — knowing something is happening internally but unable to identify what emotion it is.

This connection explains why alexithymia is so common in autism (50%+ vs 10% baseline) and why interoceptive awareness practice is the most evidence-based intervention for alexithymia. The labeling work follows the somatic awareness work; you can’t skip the body and go directly to emotion words.

See our alexithymia guide for the full framework.

7. Under-aware interoception

The most common pattern in autism and ADHD. Signs:

• Hunger unnoticed until crashing; eating on schedule rather than hunger signals
• Thirst unnoticed until headache or dizziness
• Toilet needs delayed; UTIs more common than average
• Injuries discovered hours or days after they happened
• Temperature regulation problems — underdressed in cold, overdressed in heat
• Fatigue ignored until collapse
• Emotional states unidentifiable in the body
• Stress recognised only retroactively after illness, headache, or burnout
• Doctor visits often producing surprise about what’s been happening internally
• Difficulty answering “how are you feeling physically right now?”

The intervention pattern: build deliberate attention to body signals through scheduled practice (3-4 body checks per day initially), structured external scaffolding (alarms for eating, drinking, breaks), and somatic awareness work over months.

8. Over-aware interoception

Less common but real, particularly in some autistic adults and adults with anxiety disorders. Signs:

• Constant awareness of heart rate, sometimes producing health anxiety
• Gut sensations registering as distressing
• Breath awareness producing dysregulated breathing
• Health anxiety with focus on specific body signals
• Difficulty distinguishing normal body variation from medical problems
• Sensitivity to internal sensations others don’t notice
• Sometimes panic disorder driven by misinterpretation of body signals
• Vigilance about body that itself becomes exhausting

The intervention pattern: distinguish signal precision (which is high) from signal interpretation (which may be distorted). Build a more accurate mapping of what body signals mean. Polyvagal-informed therapy helps. Sometimes the over-awareness reduces as anxiety is treated.

9. Interoception and anxiety

Anxiety involves heightened or distorted reading of internal body states. The connection is bidirectional:

Anxiety produces somatic activation (racing heart, tight chest, shallow breathing, gut tension). The body sensations are signals of the anxiety. In well-calibrated interoception, the signals get read as “I’m anxious” and the cognitive layer can address the anxiety source.

In dysregulated interoception, the signals can get misread:

• Under-aware interoception: the body is anxious but the awareness layer doesn’t register it. The anxiety expresses through behavioural patterns (avoidance, irritability, sleep disruption) without being recognised as anxiety.
• Over-aware interoception with distortion: the body sensations are misread as medical emergency. The misreading itself produces panic. This is one of the mechanisms in panic disorder.

Treating anxiety often involves interoceptive recalibration. Building accurate body awareness — neither under-aware nor over-aware-with-distortion — reduces both the anxiety production and the anxiety amplification. Polyvagal-informed therapy works substantially through interoceptive recalibration.

See our autism and anxiety guide for the autism-specific framework.

10. How it shows up in daily life

Interoceptive differences affect many domains:

• Eating. Under-aware interoception produces forgetting to eat, then crashing. Or eating past full because satiety signals don’t register. Or relying on schedule rather than hunger.
• Drinking. Chronic dehydration in adults who don’t notice thirst.
• Toilet. Late toilet awareness, sometimes UTIs.
• Sleep. Sleeping past tiredness because fatigue signals don’t register, then crashing into exhaustion. Or sleep disruption because body signals interfere with sleep onset.
• Temperature. Wearing inappropriate clothing for the weather. Hypothermia or heat illness because temperature signals don’t register.
• Pain. Discovering injuries late. Or alternatively, oversensitivity to internal pain.
• Emotional regulation. Emotions arriving fully formed without recognised buildup. Difficulty intervening before overwhelm.
• Relationships. Difficulty answering “how are you feeling about this?” in real time.
• Health. Late recognition of medical problems. Sometimes the doctor surprises the patient with what’s been happening.
• Stress. Burnout arrives without warning because the body signals weren’t read.
• Sexual function. Sometimes difficulty reading arousal signals.

The pattern adds up over years to substantial life impact. Recognising interoceptive differences as one underlying cause helps target intervention.

11. Interoceptive awareness practice

The single most impactful intervention. The practice:

1. Schedule body checks. Three or four times a day, pause and check what’s happening in your body. Heart rate. Breathing. Chest. Gut. Muscle tension. Temperature.
2. Don’t try to label the emotion yet. Just notice the body. The labeling comes later.
3. Write down what you notice. Brief notes — date, time, body state, any thoughts about what was happening.
4. After weeks of practice, look for patterns. Chest tightness on Mondays. Gut sensation before video calls. Jaw clenching at certain times of day.
5. Map sensations to emotional labels. Once the somatic patterns are clear, start associating them with emotional vocabulary.
6. Practice forward identification. When the somatic signal arrives, name the likely emotion. Over months, this builds toward forward emotional awareness.
7. Don’t expect quick results. The neurology doesn’t change but the practice does build improving awareness over years.

Structured curricula exist. Kelly Mahler’s “The Interoception Curriculum” is widely used in occupational therapy. Mindfulness-based interoception training programmes are increasingly available. The specific method matters less than consistent practice.

12. Interoception in children

Children with interoceptive difficulty — often autistic, sometimes ADHD, sometimes both — benefit substantially from explicit interoceptive teaching. Signs in children:

• Not noticing being full and overeating
• Not noticing hunger until tearful and crashing
• Late or inconsistent toilet training
• Not recognising body sensations associated with emotions
• Difficulty identifying physical pain or injury
• Not noticing being hot or cold
• Difficulty answering “how do you feel?” questions

Building interoceptive awareness in children involves:

• Explicit body mapping (“what does your tummy feel like right now?”)
• Naming sensations as they happen (“your face is hot — that’s what frustrated feels like in the body”)
• Connecting sensations to needs (“your tummy feeling like this means hungry”)
• Occupational therapy with sensory integration certification often includes interoceptive awareness work
• Structured curricula (Mahler curriculum or similar)

The earlier interoceptive awareness is built, the more it supports emotional development and self-care across the lifespan.

13. Therapies that work with interoception

Several therapy modalities explicitly work with interoception:

• Somatic Experiencing (SE). Peter Levine’s trauma framework. Works at the body level, building interoceptive awareness as central practice.
• Sensorimotor Psychotherapy. Pat Ogden’s framework. Similar emphasis on body-based awareness.
• Polyvagal-informed therapy. Stephen Porges’s framework. Works with autonomic nervous system states; interoceptive awareness is foundational.
• Internal Family Systems (IFS). Richard Schwartz’s framework. Works with parts; interoceptive awareness helps identify and engage parts.
• Mindfulness-Based Stress Reduction (MBSR). Jon Kabat-Zinn’s framework. Body-scan meditation is a central interoceptive practice.
• Acceptance and Commitment Therapy (ACT). Defusion and self-as-context work involves body awareness.
• Yoga and embodied practices. Less clinically standardised but consistently build interoceptive awareness.
• Occupational therapy with sensory integration certification. Particularly for children, includes interoception explicitly.

ND-affirming therapists increasingly recognise interoception as central to autism, ADHD, and trauma work. Standard cognitive-only therapy approaches that don’t address the body often produce incomplete results for adults with substantial interoceptive differences.

14. Current research and future directions

Active research areas:

• The autism-interoception link. Continuing to map which interoceptive patterns are most central to autism and how they affect downstream features.
• Interoception in trauma. Trauma produces specific interoceptive changes; recovery involves interoceptive recalibration.
• Interoception in eating disorders. Substantial overlap with eating disorder mechanisms; intervention promising.
• Interoception in chronic pain. Chronic pain involves distorted interoception; intervention may help.
• Interoception in alexithymia. The mechanism connection is increasingly clear; intervention is increasingly evidence-based.
• Assessment tools. Better ways to measure interoception (currently relies on self-report and indirect measures).
• Treatment approaches. More structured curricula and clinical training in interoceptive awareness.

The next decade will likely see interoception become more central to ND-affirming clinical practice as the research base solidifies. The framework is already proving useful clinically.

15. Frequently asked questions