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This article is part of our comprehensive guide to hypermobility and Ehlers-Danlos syndrome.
ADHD and hypermobility turn up in the same people a great deal more often than chance would have it, and it has stopped being something the community noticed and passed around, and there’s now a reasonable evidence base sat behind it [1][2][3]. Adults with diagnosed ADHD were more likely to have generalised joint hypermobility when somebody actually put hands on their joints and scored them, and more likely again where that hypermobility arrived with musculoskeletal symptoms or skin involvement attached to it, instead of being flexibility on its own [1], and nobody has shown that either one causes the other though, which is a distinction that matters considerably more than it sounds like it should.
What almost never gets quoted alongside all of that, is the second half. Where hypermobility has been measured in ordinary working adults, and in children at ordinary schools, instead of in people already sat in a specialist service, the association mostly isn’t there [4][5]. So, the honest version of the claim is a fair bit narrower than the headline: symptomatic hypermobility and ADHD cluster together in the people who end up being assessed for either of them, and why that happens is still being argued about.
What the Overlap Actually Looks Like
Three fairly different kinds of evidence all point the same way, which is really why this has moved past anecdote. Adults with diagnosed ADHD carried more generalised joint hypermobility than adults without it, and the link was stronger again for hypermobility defined by a positive Beighton score plus symptoms [1]. In Swedish national registry data, ADHD diagnoses turned up more often in people with Ehlers-Danlos syndrome, and in people carrying the older hypermobility syndrome label, than in matched comparisons [2].
The sibling result out of that same registry data is the interesting one though, as brothers and sisters who didn’t carry either connective tissue diagnosis themselves, still had a raised rate of ADHD [2]. That fits something shared within families, whether genetic or early environmental, and the alternative explanation, that this is all a quirk of who happens to get referred to which clinic, is the first objection most people reach for.
Now, the children. Among six to eighteen year olds attending a hypermobility service with HSD or hypermobile EDS, a substantial minority had a verified ADHD diagnosis and more again were mid assessment [3]. ADHD was more common in those classified as hEDS than in those with HSD, and the rate climbed in the older teenagers [3]. Go gently with that one though, as everybody in there had already been referred to a specialist service, so it describes a clinic population rather than hypermobile children in general [3].
Smaller and earlier work had already pointed in the same direction, with generalised hypermobility appearing more often in those with ADHD than in comparison groups [6][7].
It’s worth being clear about what’s actually being counted in all of that: the word hypermobility is doing quite a lot of heavy lifting. In the adult work, generalised joint hypermobility was established by somebody putting hands on the joints and scoring them, which is a considerably better bet than asking people how bendy they reckon they are, and the stronger association came out of a version of the definition that needed a positive Beighton score plus musculoskeletal symptoms, skin changes, or both [1]. So, what tracked ADHD most closely was the combination, the extra range plus a body that was complaining about it.
What Happens Outside the Clinics
This is where the picture splits, and among employed adults who weren’t attending any service for anything at all, self reported hypermobility showed no association with sub threshold ADHD traits, autistic traits or coordination difficulties in the main analysis [4]. Some later exploratory digging around in the same data did turn up small associations between more pronounced hypermobility and hyperactive and impulsive traits in women, which was never offered as a firm result and shouldn’t be read as one either [4].
Something fairly similar happened with eleven year olds in ordinary Swedish schools, where high Beighton scores showed no meaningful link with neurodevelopmental problems [5]. The reasons put forward for that difference are worth knowing though, and they run from genuine developmental change around puberty, to how uncommon generalised hypermobility is at that age, to simply having too few children in the symptom defined groups to pick up anything smaller [5]. So, the association lives in clinics, and clinics hold a very particular set of people.
There’s one more piece of paediatric work worth a mention, which measured passive ankle range instead of leaning on the Beighton battery alone, and it found a trend towards higher Beighton scores in children with ADHD, along with a genuinely greater passive range at the right ankle [8], though adjusting for age weakened the effects tied to diagnosis, and it’s all preliminary, so treat it as a hint about how we measure this rather than as a finding [8].
None of that makes the clinic evidence wrong, by the way. Two things can both be true here: an association can be perfectly real in the people who end up being assessed and still be completely invisible when you sample everybody, and the most likely reason is just that the flexible but symptom free majority swamp it. What it does mean is that “hypermobile people have a clear excess of ADHD at population level” goes further than the evidence does, and so does the flat denial, as an effect too small to show up in ordinary schools and ordinary workplaces hasn’t been ruled out either [4][5].
Two Different Things Both Called Hypermobility
A lot of the muddle in this area comes from one word doing two entirely separate jobs. Generalised joint hypermobility is a measurement, a set of joints that travel further than average, and plenty of people have it and get on with their lives perfectly well, thank you very much. HSD and hEDS are something else: hypermobility that arrives with joint pain, recurrent subluxations or dislocations, fatigue, mild skin findings, and often symptoms in systems that have nothing obvious to do with joints at all [9][10].
That distinction keeps mattering, as the association with neurodevelopmental conditions is repeatedly stronger in the symptomatic group than in the flexible one [1][11][10]. Which makes a Beighton score on its own a fairly blunt instrument here, and it probably explains a good chunk of why the general population work came back empty, since those samples are mostly full of people whose extra range has never cost them a day’s trouble.
HSD and hEDS then split from each other on criteria rather than on a biological marker, and those criteria have been redrawn more than once [9], which isn’t a trivial bit of admin either, as ADHD was more common in the children carrying the hEDS label than in those with HSD at the paediatric service, so if the line between those two labels moves, that comparison moves along with it [3][9].
So, when you read that hypermobility is linked to ADHD, the useful question is which hypermobility, measured how, and in whom.
What Else Is Usually in the Room
hEDS and HSD are described as multisystem conditions, and the list is genuinely long: joint pain, joints that sublux or dislocate, fatigue, orthostatic intolerance or broader dysautonomia, gut symptoms, bladder and pelvic symptoms, and skin findings that vary with the subtype and with whichever criteria were being used at the time [9][12][13].
In that paediatric group, the children who also had ADHD had higher rates of fatigue, sleep problems and urinary tract problems than the ones who didn’t [3]. In young people aged ten to twenty four carrying an hEDS or hypermobility syndrome label, developmental disorder diagnoses were common, and so were cardiovascular, digestive and anxiety diagnoses [14]. That last one comes out of insurance billing records though, so it shows you what gets coded and how often, and it can’t tell you what started when or what caused what [14].
Across adult hypermobility groups, pain, fatigue, gut symptoms, autonomic symptoms, anxiety, depression and brain fog are all reported frequently [15][16][17], and the autonomic side is common enough that the differences between hEDS and HSD on those symptoms come out as fairly subtle [16][15]. Mental health diagnoses turn up often too, and they get managed unevenly, which is a problem all of its own when somebody is already being assessed for attention difficulties [17].
The gut deserves a mention of its own, as reflux, constipation, bloating and the rest are common enough in hEDS for gastroenterology to have its own guidance on what to expect [13]. Nobody concentrates well while their stomach is misbehaving, and nobody sleeps well either.
None of which makes hypermobility a cause of ADHD [18][19]. It does mean that attention and concentration are being asked to operate in conditions that would drag on anybody, which matters enormously for how the two get told apart in a fifteen minute appointment (and the community has been saying this for years, usually to somebody who was only ever interested in one of the two).
Autism Turns Up in Here Too
ADHD isn’t the only neurodevelopmental condition sitting in this literature, and reading it as though it were will mislead you. Adults with autism also show the association with generalised joint hypermobility, and the whole area gets treated as neurodevelopmental differences turning up across joint hypermobility, HSD and the Ehlers-Danlos syndromes, rather than as an ADHD specific story [11][10][19].
Now, a lot of the work also bundles the conditions together. Where hypermobility has been linked to dysautonomia and pain in neurodivergent adults, ADHD was grouped in with autism and Tourette syndrome, which is completely understandable when numbers are tight, and not a lot of use at all when what you want to know is which of the three the joints are actually tracking [6]. So, an association found in a mixed neurodivergent group carries all three of those conditions inside it [6], which is reason enough to be careful with any sentence that starts “ADHD specifically”.
The Four Explanations People Offer
Four mechanisms come up over and over again: joint position sense, chronic pain, dysautonomia, and shared genetics [3][18], and not one of them has been tested as a pathway, because they’re all built out of observations that happen to line up, which makes them somewhere to start looking [10][19].
– Joint position sense: The proposal is that laxer tissue gives a less precise signal about where a joint actually is, so the brain spends more on knowing where the limb is and on keeping it under control, and that borrowing comes out of the same budget everything else needs [3][20][19]. It stays a model though, as nobody has tested it directly in an ADHD specific experiment, which won’t shock anybody who reads much in this area [19][21].
– Chronic pain: Pain is common in symptomatic hypermobility and has been put forward explicitly as one of the bridges to attention and concentration difficulties [18][20]. There’s newer genetic work showing real biological overlap between ADHD and chronic pain at multiple body sites, with the shared signal landing in neurodevelopmental pathways, and hypermobility wasn’t in that analysis at all [22].
– Autonomic load: In joint hypermobility syndrome, autonomic symptoms and orthostatic syndromes were much more common than in comparison groups when they were formally tested [23]. Among adults with neurodevelopmental conditions, the severity of hypermobility mediated the relationship with orthostatic intolerance and musculoskeletal pain, though ADHD was grouped in with autism and Tourette syndrome there rather than examined on its own [6]. And in unscreened preschool children, an exaggerated pulse pressure change on standing went along with higher inattention scores, in children who had no ADHD diagnosis at all [6].
– Shared genetics: ADHD is highly heritable and polygenic, and the cross disorder psychiatric genetics show overlapping loci concentrated in neurodevelopmental pathways [24][25]. The sibling result out of the registry fits some shared familial liability with hypermobility conditions [2], and in hEDS, genetic correlation has been reported with anxiety, depression, autism, migraine, gut disease and chronic fatigue related conditions, with ADHD absent from it, and that work hasn’t completed peer review [26].
So, all four of them have something in common, since each one predicts a stronger link where hypermobility is symptomatic than where the joints are simply bendy, which is exactly what the clinic evidence shows [1][11]. What none of them accounts for though, is why the signal thins out in ordinary schools and ordinary workplaces, and in our opinion that’s the result most likely to embarrass whichever mechanism eventually wins.
Why the Reported Rates Swing About So Much
Different pieces of work use different definitions of hypermobility, different Beighton cutoffs, physical examination in some and a questionnaire in others, and diagnostic labels that have been renamed twice inside twenty years, from hypermobility syndrome to HSD and hEDS [27][28][9]. All that variation is most of why the reported rates vary so widely, and it makes putting two findings side by side genuinely difficult [29][9]. It’s also why you’ll see wildly different figures quoted inside the same argument, by people who are all reading the research correctly and all describing slightly different populations.
Three specific things move the answer, and they’re all worth recognising when you meet a number in the wild.
– Who was asked, and how: A questionnaire about bendiness and a clinician scoring nine joints do not identify the same people, and the more symptom based definitions shrink the group further while sharpening it [1][27].
– Where the sample came from: A specialist service, a national registry, an insurance database and a school all have different people in them, and the association is strongest in the first and weakest in the last [3][2][14][5].
– Which label was in use that year: Joint hypermobility syndrome, HSD and hEDS have overlapped and replaced one another over time, so older and newer work isn’t describing an identical group even when the words look similar [9][28].
None of that is very satisfying, and the honest summary is fairly dull: the overlap is real in the populations where it’s been found, and the size of it depends on definitions that are still moving about [29].
What This Means If You Have Both
– Symptomatic is the word doing the work: If your hypermobility comes with pain, subluxations, fatigue or autonomic symptoms, you’re in the group where the association actually shows up, and a bare Beighton score doesn’t put you there or keep you out of it [1][11][10].
– The load on your concentration is real: Pain, fatigue, poor sleep, gut symptoms and standing up making you feel awful are all common in this population, and every one of them taxes concentration before anybody’s attention span is even in question [15][16][17][3]. That’s a mechanism, and it’s worth naming as one.
– Don’t let one diagnosis absorb the other: The overlap runs both ways, so hypermobility doesn’t explain away ADHD, and ADHD doesn’t explain away symptoms in a joint, a gut or a blood pressure reading [18][19]. Where both are present, both need managing, as nothing in the research so far shows that treating one of them sorts out the other.
– What to track, if you want your own data: If concentration is reliably worse on the days pain, fatigue or standing symptoms are worse, that pattern is at least consistent with the load explanation, and it’s the kind of thing worth writing down before an appointment (in our opinion a fortnight of scribbled notes is worth a great deal more than trying to remember it all in the room).
– Sleep, gut and standing are the three that get ignored: Fatigue, sleep problems and urinary symptoms were all more common in the children who had both, and the adult symptom lists read much the same [3][15][16]. Those are the things that get treated as background noise while the attention difficulties get all of the attention, and in our opinion they’re considerably more tractable than either diagnosis.
A raised rate in a group isn’t a prediction about you though. Plenty of people with symptomatic hypermobility have no attention difficulties at all, and plenty of people with ADHD have entirely ordinary joints [4][5]. An association describes a population, and your own combination of symptoms is still the thing worth working from.
What Nobody Knows Yet
Now, the direction is still unresolved, as registry, adult and paediatric evidence all support the association, and none of it establishes that the connective tissue side comes first, that the neurodevelopmental side comes first, or that both sit downstream of something else again [1][2][3].
Whether the four proposed mechanisms do any real work is also open, as they were assembled out of findings that point the same way rather than out of anything designed to test them [10][19], and proprioception in particular has never been examined in an ADHD specific experiment, so it sits somewhere between plausible and untested [19][21].
The childhood picture is the gap that bothers us most, because the association is visible in specialist paediatric services and absent in eleven year olds at ordinary schools, and the explanations on offer for that range from real change around puberty to nothing more interesting than too few children to detect it [3][5]. And in the genetics, what’s been reported in hEDS so far is correlation with anxiety, depression, autism, migraine, gut disease and fatigue related conditions, with ADHD still absent from it [26].
Then there’s the question nobody has really answered at all, which is whether any of it changes what you should actually do, and there’s no evidence in front of us that managing pain, fatigue or autonomic symptoms improves attention in this group, or that treating ADHD changes anything about the joints, so anybody presenting either of those as established has gone well past the evidence [18][19]. It’s a reasonable thing to suspect on the load argument, and suspecting is a long way off knowing.
Measurement is the quiet one sat underneath all of it, as until the same definitions of hypermobility and the same way of establishing ADHD get used across adult, paediatric and general population work, the numbers will keep disagreeing and everybody will keep quoting whichever one suits them [27][9][28]. Nobody has followed the same children through puberty with the same definitions at both ends either, and until somebody does, this is roughly as far as it honestly goes.
The Fibro Guy
