More Than 1 In 4 Patients With Worst Chronic Pain Screened Positive For ADHD Symptoms

For people living with severe, treatment-resistant chronic pain, the search for answers can feel endless. A new study suggests that ADHD-like symptoms may be going unnoticed in pain care, and that oversight could be making an already difficult condition significantly worse.

Among patients referred to specialized pain centers for pain that had not improved with standard care, more than one in four of those reporting the most extreme pain, scores of 9 or 10 on a 10-point scale, screened positive for ADHD symptoms. Most of those patients had likely never been evaluated for the condition. The finding comes from a large study conducted across 13 pain centers in Japan, published in Scientific Reports.

Chronic pain affects hundreds of millions of people globally. When standard treatments fail, patients often end up at specialized centers as a last resort. Researchers wanted to know whether symptoms of two brain-based developmental conditions, ADHD and autism, might be quietly worsening outcomes in these patients. What they found was a clear pattern: ADHD symptoms tracked closely with pain severity, while autism symptoms did not.

ADHD Symptoms and Severe Chronic Pain: A Pattern Across 13 Centers

Researchers enrolled 958 adult patients visiting multidisciplinary pain centers across Japan for the first time between June 2019 and December 2021. Every participant had pain lasting at least three months that had not responded to standard medical care. Each patient completed validated screening tools covering ADHD symptoms, autism symptoms, pain intensity, anxiety, depression, sleep problems, catastrophic thinking about pain, quality of life, and confidence in managing their condition.

Among all participants, 17.1% screened positive for ADHD symptoms, more than double the rate typically reported in the general population. Meanwhile, 4.4% screened positive for autism. When researchers sorted patients into groups by pain intensity, the proportion screening positive for ADHD climbed steadily as pain worsened. Among the 84 patients reporting average scores of 9 or 10 out of 10, a full 27.4% screened positive for ADHD symptoms. No such pattern appeared for autism, whose rate stayed flat regardless of how much pain a patient reported.

Patients who screened positive for ADHD scored worse across every pain-related measure in the study: higher pain intensity, greater difficulty with daily functioning, worse sleep, more anxiety and depression, more catastrophic thinking about pain, lower quality of life, and less confidence in managing their condition. Autism told a different story. Patients who screened positive did report worse functioning, sleep, anxiety, depression, quality of life, and self-confidence, but their actual pain intensity scores were not significantly different from those who screened negative. Researchers noted that people with autism often experience pain in unusual ways, sometimes underreporting intensity due to differences in how distress is expressed, a pattern sometimes called the “pain paradox.”

How Anxiety and Depression May Connect ADHD Symptoms to Worse Pain

Having established that ADHD symptoms were strongly associated with pain severity, the research team used a statistical technique called path analysis to map out how that connection might work. Two different explanations fit the data well.

In the simpler model, ADHD symptoms were associated with higher levels of anxiety and depression, which in turn were associated with more severe pain. In the fuller model, ADHD symptoms were linked to anxiety and depression, which then fueled catastrophic thinking about pain, an exaggerated mental response where a person dwells on pain and feels helpless against it, which was then linked to more severe pain.

In these models, the ADHD-pain link appeared to run through these emotional and mental middlemen rather than through a direct path. Because the study captured only one point in time, this pathway should be read as a statistically plausible explanation, not proof that ADHD symptoms lead to anxiety, depression, catastrophic thinking, and then worse pain.

Overlooked in Plain Sight: ADHD Screening in Pain Patients

One of the study’s most important observations involves how rarely ADHD gets identified in pain patients. Even in psychiatric settings, the researchers noted, more than 80% of adult ADHD cases go undiagnosed. Most people with chronic pain, however, see orthopedic surgeons, pain specialists, or other providers who may have limited training in recognizing ADHD. The researchers concluded that ADHD symptoms are likely to be largely overlooked in these populations.

Because the ADHD screening tool used in the study misses roughly one in three actual cases, the researchers estimated that the true proportion of patients meeting full diagnostic criteria could be higher than the 17.1% screening rate, and potentially around 40% among those with the most extreme pain, if assessed through formal clinical interviews.

Prior studies cited by the authors suggest that when chronic pain and clinically diagnosed ADHD occur together, ADHD-targeted treatment may help some patients with both pain and thinking difficulties. That does not mean ADHD medication is a broad pain treatment. Proper evaluation could open another care pathway for a subset of patients, as part of a comprehensive plan.

Screening for ADHD Could Be a Missing Piece in Pain Care

Treating only the physical aspects of chronic pain while missing the anxiety, depression, and catastrophic thinking associated with ADHD symptoms may leave a major driver of suffering unaddressed. For patients referred to specialized pain centers whose pain has resisted everything else, the researchers were direct: active screening for ADHD symptoms should be part of pain management.

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Disclaimer: This article is based on published scientific research and is intended for informational purposes only. It is not intended as medical advice. Consult a qualified healthcare provider regarding any medical condition or treatment.

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