Published March 2026 · 8 min read
For most of the last decade, the interesting science on autism and ADHD was happening at opposite ends of the body. Autism research was mapping the strange silence of the interior — the reason so many autistic adults cannot tell whether they are hungry, thirsty, tired, or in pain until the signal becomes a crisis. ADHD research was chasing the exterior — dopamine, reward, distraction, executive function. In 2025 those two programmes collided. Two major systematic reviews, one in Frontiers in Psychiatry and one in Psychophysiology, now place interoception — the sense of the internal body — at the centre of both conditions. For AuDHD, the overlap is where the real story lives.
What interoception is, and why it is not just “body awareness”
Interoception is the brain’s ongoing read-out of signals from inside the body: heart rate, breath, gut state, temperature, muscle fatigue, the subtle somatic markers of hunger, thirst, arousal and emotion. It has at least three measurable dimensions — accuracy (can you count your own heartbeats?), sensibility (how aware of your body do you think you are?), and awareness (how well do those two match?). All three matter, and they come apart in clinically meaningful ways.
The 2025 meta-analysis of 31 studies in autism found that roughly half of autistic individuals meet criteria for alexithymia — the difficulty identifying and describing one’s own emotions — and that this gap is mediated by interoceptive deficits. Around three-quarters of autistic adults report significant “interoceptive confusion” unless a bodily signal becomes extreme. The 2025 review of interoception in ADHD reached a structurally similar conclusion: interoceptive accuracy is reliably reduced in people with higher inattention, hyperactivity, impulsivity, emotional dysregulation and executive dysfunction.
The body’s whispers do not reach the cortex. The shouts do. By the time the signal is loud enough to be decoded, it is often a meltdown, a shutdown, or a burnout.
Paraphrasing the 2025 Frontiers in Psychiatry review
Why this matters more for AuDHD than for either diagnosis alone
If one system is dampening the interior signal (the autistic pattern) and another is pulling attention relentlessly toward the exterior (the ADHD pattern), the combined effect is not additive — it is multiplicative. You get a body that is hard to hear plus an attention system that is not listening. The predictable consequences are well-documented in clinical practice: delayed hunger recognition, chronic dehydration, pain that is ignored until it is injury, sleep pressure that is missed until it is collapse, and emotional states that jump from 0 to 100 with no intermediate signal.
This is also the mechanistic bridge to AuDHD burnout. If you cannot feel “tired” until you are flattened, you cannot pace. If you cannot pace, you alternate between overfunctioning and collapse. The cycle is the condition.
What the evidence says actually helps
The interventions with the strongest 2024-2025 evidence are not cognitive. They are somatic and skill-based. Interoception-based programmes for autistic children — including the “Interoception Curriculum” developed by Kelly Mahler — have shown statistically significant pre-post improvements in both interoceptive awareness and emotion regulation. The common ingredient is explicit, repeated, low-stakes practice at mapping the inside of the body, in words, before emotions become overwhelming.
For AuDHD adults, three evidence-informed moves are worth trying:
One — body scanning on a timer, not on a feeling. Set a recurring prompt to check in with hunger, thirst, temperature, tension, and fatigue. You are not trying to feel the signals more deeply; you are trying to get in front of them before they have to shout.
Two — external scaffolding for interior data. Water bottles with hourly markers, hunger alarms, sleep trackers, heart rate variability apps. These are not neurotic hacks; they are cognitive prostheses for a signal pathway the brain is not delivering reliably.
Three — language practice. Alexithymia is partly a vocabulary problem. The more granular your internal lexicon — the difference between “anxious” and “overstimulated”, “tired” and “depleted” — the earlier you can intervene.
The research trajectory here is unusual and hopeful. For the first time, the science is catching up with what late-diagnosed AuDHD adults have been describing for years: the problem is not in the feelings. It is in the channel that was supposed to carry them.
Further reading
Frontiers in Psychiatry (2025). Interoception in individuals with autism spectrum disorder: a systematic literature review and meta-analysis.
Bruton, M. (2025). Diminished Interoceptive Accuracy in Attention-Deficit/Hyperactivity Disorder: A Systematic Review. Psychophysiology.
Mahler, K. (2023). The Interoception Curriculum.
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