Being double jointed, or joint hypermobility, does appear to be significantly linked to ADHD. People with ADHD are roughly four times more likely to have generalized joint hypermobility than the general population, and research consistently finds the two conditions overlap far more than chance would predict. The connection isn’t coincidental: emerging evidence points to shared biological pathways involving connective tissue and the nervous system.
How Strong Is the Overlap?
About 20% of the general population has some degree of joint hypermobility. Among people with ADHD, that number jumps to roughly 51%, based on research published in Frontiers in Psychiatry that compared neurodivergent individuals to a general population sample. That study found people with ADHD were 4.34 times more likely to meet criteria for generalized joint hypermobility than people without ADHD. Earlier studies had placed estimates anywhere from 32% to 74% depending on whether the participants were adults or children, but the pattern is consistent: ADHD and hypermobility travel together at rates well above what you’d expect.
The link also works in the other direction. When researchers looked at children already diagnosed with hypermobile Ehlers-Danlos syndrome (hEDS) or hypermobility spectrum disorder (HSD), 16% had a confirmed ADHD diagnosis, more than three times the expected rate of about 5% in the general pediatric population. Among older teens in that group (ages 17 to 18), the rate climbed to 46%. A large Swedish population study found that individuals with Ehlers-Danlos syndrome were 5.6 times more likely to carry an ADHD diagnosis than those without it.
Why These Two Conditions Co-Occur
The short answer is that nobody has identified a single gene or mechanism that explains the link. But several plausible threads are coming together. Connective tissue isn’t just in your joints. It forms a structural scaffold throughout your entire body, including around nerves, blood vessels, and the brain. When connective tissue is stretchier or less structurally stable than typical, the effects ripple beyond flexibility.
One pathway involves proprioception, your body’s sense of where it is in space. Proprioceptive signals come partly from sensors in your joints and connective tissue. When those tissues are unusually lax, the feedback to your brain can be less precise, which may contribute to the restlessness and fidgeting characteristic of ADHD. People with hypermobility often describe needing to move more to “feel” where their body is, a sensation that overlaps with ADHD-related hyperactivity.
Another thread involves the autonomic nervous system, which controls heart rate, blood pressure, and other functions you don’t consciously manage. Dysautonomia (problems with this system) is common in hypermobile people and can cause fatigue, brain fog, and difficulty concentrating. These symptoms can look like, or worsen, ADHD. Research has shown that joint hypermobility significantly mediates the relationship between neurodivergent traits and chronic pain or fatigue, suggesting the connective tissue itself plays an active role rather than being a bystander.
Hypermobility Spectrum Disorder vs. Ehlers-Danlos Syndrome
Not everyone who is “double jointed” has a diagnosable condition. Joint hypermobility exists on a spectrum. At the milder end, you might just be unusually flexible with no real consequences. Further along, hypermobility spectrum disorder (HSD) involves joint looseness plus symptoms like pain, fatigue, or frequent injuries. At the more severe end, hypermobile Ehlers-Danlos syndrome (hEDS) involves widespread connective tissue involvement with more systemic effects.
The ADHD connection appears to get stronger as hypermobility becomes more clinically significant. In one study of children, 23% of those with hEDS had a verified ADHD diagnosis compared to 11% in the HSD group. That difference was statistically significant. Children with hEDS also reported higher rates of fatigue (71% vs. 46%), and fatigue alone can amplify attention problems. If you’re hypermobile and struggling with focus, the severity of your connective tissue involvement may matter more than the flexibility itself.
How Hypermobility Is Assessed
Clinicians use the Beighton score, a nine-point system that tests flexibility in your elbows, knees, fingers, wrists, and lower back. A score of 4 or above (out of 9) generally indicates generalized joint hypermobility. It’s a quick physical exam, not a blood test or imaging study. Newer research is exploring whether measuring passive range of motion at the ankles could serve as an even simpler screening tool for hypermobility in children with neurodevelopmental conditions, since ankle flexibility correlates well with the full Beighton score.
Hypermobility screening isn’t standard practice during ADHD evaluations, though growing awareness of the overlap is changing that. If you have ADHD and notice you’re unusually flexible, experience frequent joint pain or subluxations, bruise easily, or deal with chronic fatigue, it’s worth bringing up with a healthcare provider.
What This Means for Managing Both
When ADHD and hypermobility coexist, each condition can make the other harder to manage. Chronic pain and fatigue from hypermobility drain the mental resources you need for focus and executive function. Meanwhile, ADHD can make it harder to stick with the consistent physical therapy routines that help stabilize hypermobile joints.
For the hypermobility side, the strongest evidence supports therapeutic exercise and motor function training. The goal isn’t to become less flexible but to build muscle strength and control around loose joints, reducing pain and injury risk. This typically involves targeted strengthening exercises rather than stretching, which hypermobile people already have plenty of. Some people benefit from adaptive equipment like supportive braces, ergonomic seating, or compression garments.
For the ADHD side, understanding that some of your restlessness or fidgeting might be proprioceptive (your body seeking positional feedback) rather than purely neurological can reframe how you approach it. Movement breaks, weighted items, and activities that provide strong body-awareness input like swimming or climbing may help with both the ADHD restlessness and the joint stability needs. A multidisciplinary approach that addresses the psychological impact of living with both conditions tends to produce the best outcomes, since each diagnosis can feel more manageable when neither is treated in isolation.