The Pain That Resists Everything
Years of physiotherapy. Painkillers. Lifestyle changes. Nothing works consistently. Doctors can't find a clear cause. What if the missing piece isn't physical, but neurological?
A 2026 study from the University of Tokyo examined 958 adult patients in treatment for chronic pain across 13 multidisciplinary pain centers in Japan. What they found challenges how chronic pain is understood and treated.
The Study: 13 Pain Centers, 958 Patients
Published in Scientific Reports (Nature), the study screened all patients for ADHD and autism traits using validated tools alongside standard pain assessments.
Key findings:
- 17.1% of chronic pain patients screened positive for ADHD traits - compared to roughly 5-7% in the general adult population, that is 2.4 times more likely.
- 27.4% of patients with extremely severe pain screened positive for ADHD traits.
- For autism traits: 4.4% screened positive, but no significant link was found between autistic traits and pain severity in this study.
The Mechanism: Not Direct, But Amplified
ADHD doesn't cause chronic pain directly. But the data revealed a clear pathway:
ADHD traits ? anxiety and depression ? pain catastrophizing ? amplified pain perception
Pain catastrophizing is the tendency to focus intensely on pain, feel helpless about it, and expect the worst. ADHD traits - particularly emotional dysregulation and difficulty shifting attention away from negative stimuli - feed directly into this cycle.
When researchers statistically controlled for anxiety, depression, and pain catastrophizing, the relationship between ADHD and pain severity weakened considerably. The ADHD traits themselves don't directly amplify the pain signal: they reshape the psychological context around it.
Most Adults with ADHD Don't Know They Have It
ADHD remains widely underdiagnosed in adults, particularly women and in non-Western countries. Many patients entering pain clinics have never been assessed for neurodevelopmental conditions.
This means a significant proportion of patients with treatment-resistant chronic pain may be following the wrong treatment protocols entirely - addressing only the pain signal, not the neurological context that amplifies it.
What This Means for Treatment
This study doesn't claim that treating ADHD will cure chronic pain. But it suggests:
- Neurodevelopmental screening should be part of chronic pain assessment protocols.
- Addressing anxiety, depression, and pain catastrophizing in ADHD patients may improve pain outcomes.
- Therapies targeting emotional regulation (CBT, ADHD-specific coaching) could complement standard pain treatment.
An Important Caveat
This is an observational study. It identifies associations, not causal relationships. The sample comes from Japanese pain clinics, which may not fully represent all populations. Replication in larger, more diverse samples is needed.
Still, the findings are consistent with growing evidence that ADHD and chronic pain frequently co-occur, and that this overlap has clinical consequences that are routinely missed.
The Bigger Picture
Chronic pain that resists standard treatment is one of the most frustrating clinical challenges in medicine. This research adds to a body of evidence suggesting that for a meaningful subset of patients, the answer may lie not in the body, but in the brain.
Source: Kondo et al. (2026). Attention-deficit/hyperactivity disorder and autism spectrum disorder in chronic pain: a study in Japanese pain centers. Scientific Reports. DOI: 10.1038/s41598-026-45300-y