Interoception: The Hidden Sense You've Never Heard Of
You have five senses you learned in school: sight, sound, taste, touch, smell. But there's a sixth sense most people don't know about, and in people with ADHD and autism (affecting 30-50% of both populations differently), it's often broken. That sense is interoception—the ability to feel what's happening inside your body. It's why you notice hunger, thirst, a full bladder, a racing heart, or an urge to move. Without accurate interoception, you can't read your body's signals, and your body is constantly trying to tell you something.
Interoception is your body's internal radar. Sensory receptors throughout your organs, muscles, and viscera send constant signals to your brain: "You need water." "Your heart is beating fast." "Your stomach is full." "You need to pee." "Your muscles are tight." Your brain integrates these signals into conscious awareness. People with accurate interoception feel these messages clearly and respond—they drink when thirsty, eat when hungry, take breaks when tired. People with interoceptive dysfunction don't feel these signals, or feel them only after they've reached crisis levels. You might not notice hunger until you're lightheaded, or not realize you need the bathroom until it's urgent.
Interoceptive Differences in ADHD and Autism
Research shows that people with ADHD and autism have reduced interoceptive awareness. They have fewer or weaker signals from their bodies, or the brain doesn't process these signals effectively. In ADHD, interoceptive dysfunction often manifests as: ignoring hunger and thirst (forgetting to eat until 6 PM), missing fatigue (pushing until crash), poor sense of time passing (losing track of hours), difficulty recognizing emotional states ("I didn't realize I was angry until I blew up"), and impulsivity (acting without noticing internal "caution signals"). In autism, interoceptive differences can include sensory integration challenges where internal signals feel overwhelming or muted, difficulty recognizing pain, limited awareness of bladder/bowel signals, and difficulty distinguishing between different emotional or physical states ("I just feel bad, I don't know what kind of bad").
The consequence is disconnection from your body. You might eat nothing all day, then binge at night. You might not notice thirst until you're dehydrated and getting a headache. You might work 12 hours without a break because you didn't feel fatigue signals. You might not realize you're angry, anxious, or depressed until the emotion explodes outward. Your body is sending signals; your brain just isn't receiving them clearly.
Rebuilding Body Awareness
Scheduled check-ins: Don't rely on signals; check intentionally. Set phone reminders: "Did you eat lunch?" "Have you drunk water?" "Do you need a bathroom break?" "How are you feeling emotionally?" This externalizes the interoception function your nervous system struggles with. Over time, pairing these external cues with body awareness can strengthen your signaling.
The body scan: Daily, sit quietly and scan your body systematically: forehead (tension?), jaw (clenched?), shoulders (tight?), chest (breathing fast?), stomach (hungry, full, nauseous?), bladder (full?), legs (restless, tense?). This practice reactivates awareness of internal signals and teaches your brain to listen. Even 2 minutes daily helps. Many people with ADHD/autism practice body scans for months before internal signals become more noticeable.
Extreme sensory input: Your internal signals might be muted, but extreme input is harder to miss. Cold water on your face (dive reflex), intense exercise (muscle signals), temperature contrast (hot shower then cold)—these create strong interoceptive signals. Some people find that regular intense sensory input (ice baths, saunas) actually strengthens overall interoceptive awareness by training the nervous system to notice.
Movement and proprioception: Proprioceptive activities (pressure, stretching, heavy lifting) activate body awareness intensely. Yoga, stretching, or dance help your nervous system map its own position and state. Progressive muscle relaxation—tensing and releasing each muscle group—teaches you what different muscle states feel like.
Behavioral Workarounds
If interoceptive signals are muted, build external systems. Set phone alarms for meals, water, and bathroom breaks—not forever, but until habits form and your body starts signaling on its own. Use a visible water bottle; seeing it reminds you to drink. Eat on a schedule, not by hunger, until rhythm helps your body anticipate feeding times. Track mood/energy in a journal; external notes help you notice patterns your internal awareness misses. Pair physical sensations with emotional labels: "When I feel this chest tightness and racing thoughts, I'm anxious." Over time, you learn to recognize these pairings.
Emotional interoception: Many people with ADHD/autism can't distinguish between emotions—they feel "bad" but don't know if it's angry, anxious, sad, or overwhelmed. Use an emotion wheel or feelings chart daily. "What's the name of what I'm feeling right now?" Naming builds awareness. Therapists specializing in emotion recognition can help train this skill—it's learnable, though it takes practice.
When Interoception is Heightened
Some people experience the opposite: hyperinteroception, where internal signals feel overwhelming. They're acutely aware of every heartbeat, breath, or stomach movement. This can trigger anxiety ("Is my heart beating normally?") or panic. For hyperinteroception, the strategy inverts: external focus (distraction, mindfulness on surroundings rather than body), acceptance (the signal is just a signal, not a threat), and sometimes grounding techniques. Interoceptive therapy can help calibrate awareness to a tolerable level.
Interoception is foundational to wellbeing—hunger, thirst, fatigue, emotion, and pain regulation all depend on it. If your internal signals are muted or absent, that's not laziness or lack of self-care; it's a neurological difference. With intentional practice, external systems, and patience, you can rebuild body awareness and stop ignoring what your body is trying to tell you.
Take the Sensory Sensitivity Assessment | Screen for Autism Traits | Assess for ADHD Traits
References
Garfinkel, S. N., Tiley, C., O'Keeffe, S., Harrison, N. A., Seth, A. K., & Critchley, H. D. (2016). Discrepancies between interoceptive accuracy and interoceptive awareness. Neuropsychologia, 95, 148-158.
Khalsa, S. S., Adolphs, R., Cameron, O. G., Critchley, H. D., Davenport, P. W., Feinstein, J. S., ... & Zucker, N. (2018). Interoception and mental health. Trends in Cognitive Sciences, 22(7), 578-591.
Murphy, J., Brewer, R., Catmur, C., & Bird, G. (2019). Interoception and mental health: Towards a transdiagnostic understanding. Nature Reviews Neuroscience, 21(3), 126-143.
Shah, P., Hall, R., Catmur, C., & Bird, G. (2016). Alexithymia, not autism, is associated with impaired interoception. Royal Society Open Science, 3(8), 160523.