You could always touch your thumb to your wrist. You were the kid who folded into impossible shapes on the classroom floor, the one whose elbows bent a little too far back, the one adults called “double-jointed” like it was a party trick. And then somewhere in your twenties or thirties the party trick stopped being fun. Now it is ankles that roll for no reason, a shoulder that slips, a fatigue you cannot explain to anyone, and pain that no scan ever seems to find. If you are autistic and reading that with a jolt of recognition, you are not imagining the connection.
Autism and hypermobility frequently occur together. Hypermobility means your joints move beyond the typical range, often because of differences in the connective tissue that holds your body together. A 2025 review found that nearly 4 in 10 autistic people meet the criteria for hypermobile Ehlers-Danlos syndrome (hEDS) or hypermobility spectrum disorder (HSD) when properly assessed. The overlap is not a coincidence: autism, hypermobility, chronic pain, fatigue, and autonomic problems appear to share underlying threads in the nervous system and connective tissue. For many late-diagnosed autistic adults, understanding this link explains years of unexplained physical symptoms.
What the research shows
- When clinically assessed, around 39% of autistic people met the criteria for hEDS or HSD, and joint hypermobility was significantly more common in autistic people across the majority of studies reviewed. Baeza-Velasco et al. (2025)1
- In a study of 1,754 adults, autistic people experienced hypermobility-related conditions differently from non-autistic people, reporting worse physical and mental health and more difficulty getting the right support. Crompton et al. (2026)2
- Joint hypermobility was found at higher rates in neurodivergent people, and it linked neurodivergence to dysautonomia (problems with automatic functions like heart rate) and chronic pain. Csecs et al. (2022)3
- Brain imaging found that hypermobile people had greater volume in the amygdala and heightened interoceptive sensitivity, pointing to a shared brain-body basis for the anxiety and bodily awareness differences in this group. Eccles et al. (2012)4
Why your joints and your wiring might be connected
For a long time, the bendy joints and the autism were treated as two unrelated facts about you. One belonged to a physiotherapist, the other to a psychologist, and the two never compared notes. What the last few years of research have done is put them in the same room.
Hypermobility usually comes down to connective tissue, the collagen-based material that holds your joints, skin, and organs in place. When that tissue is more elastic than usual, your joints move further than they should, and the rest of your body has to work harder to keep you stable. The same connective tissue is found everywhere, which is why hypermobility is rarely just about flexible fingers. It tends to travel with a cluster of other things: stretchy or fragile skin, easy bruising, digestive trouble, dizziness on standing, and a deep, baffling tiredness.
The overlap with autism is now well documented rather than anecdotal. The 2025 systematic review by Baeza-Velasco and colleagues pulled together twenty studies and found a consistent association, with the majority reporting significantly higher rates of hypermobility in autistic people.1 Researchers do not yet have the full mechanism, but the leading ideas point to shared genetics affecting both connective tissue and brain development, and to the way the autonomic nervous system, the part running your heart rate, digestion, and temperature, behaves differently in both autism and hypermobility.
What hypermobility actually feels like from the inside
If you have lived with it your whole life, you may not even register it as a symptom. You assumed everyone’s joints ached after a normal day. You assumed everyone had to concentrate to sit still, because holding yourself upright in a chair is genuinely more tiring when your ligaments do not lock you into place the way other people’s do.
From the inside, hypermobility can feel like a joint that slides out of position and back (a subluxation) during something as ordinary as reaching for a mug. It can feel like clumsiness, because when your body is not sure exactly where your limbs are, you misjudge edges and doorframes. It can feel like being told you have “growing pains” as a child and chronic pain as an adult, with the same body and no growing in between. And it very often feels like fatigue that no amount of sleep touches, because muscles that are quietly compensating for loose joints all day do not get to clock off.
The interoception thread
Here is where the two halves of you meet. Interoception is your sense of what is happening inside your body: hunger, thirst, a full bladder, a racing heart, the early signal that you are getting overwhelmed. Many autistic people experience interoception differently, either muted, so you miss signals until they are an emergency, or amplified, so ordinary bodily sensations feel loud and alarming.
Hypermobility appears to sit on the same circuit. Eccles and colleagues found that hypermobile people had measurable differences in the brain, including greater amygdala volume and heightened interoceptive sensitivity.4 That matters because it offers a physical explanation for something you may have been told was “just anxiety.” When your body is sending unusual signals and your brain is wired to read those signals intensely, a baseline of unease is not a character flaw. It is a nervous system doing exactly what its hardware predicts.
“For thirty years I thought I was just weak and dramatic. Tired all the time, sore all the time, panicking over things that seemed small. Finding out my joints and my brain were part of the same story didn’t fix anything overnight, but it was the first time my body made sense to me.”
— Autistic adult, HeyASD community
Dysautonomia, fatigue, and the exhaustion you cannot explain
One of the most common and least understood parts of this picture is dysautonomia: trouble with the automatic systems your body is supposed to run without you thinking about them. The version many hypermobile people meet is a racing or pounding heart on standing, lightheadedness, brain fog, and waves of exhaustion that arrive without warning. Csecs and colleagues found that joint hypermobility was the thread linking neurodivergence to exactly this kind of autonomic dysfunction and to chronic pain.3
If you have spent years being told your bloodwork is fine while you can barely make it through a supermarket, this is the missing piece. The exhaustion is not laziness and it is not in your head. It is the predictable cost of a body that is managing loose joints, an over-firing stress response, and an autonomic system that does not regulate smoothly, all at once, all day.
So much of late diagnosis is the slow realisation that the body was keeping score the whole time, alongside the mind. The Unmasking Years is about exactly that period, when the years before everything made sense finally start to come into focus, body and all.
Getting taken seriously at the doctor’s office
This is the part that costs the most. If you are autistic, and especially if you mask, being believed in a medical setting can be its own battle, and the new research bears this out. Crompton and colleagues found that autistic people with hEDS and HSD reported worse health experiences and more difficulty getting appropriate support than non-autistic people with the same conditions.2 Part of that is masking: if you have spent a lifetime flattening your face and your voice so you do not seem “too much,” you may walk into an appointment in genuine pain and present as perfectly calm. The doctor reads calm as fine.
A few things help. Write your symptoms down before you go, because recall under social pressure is hard and you should not have to perform distress to be taken seriously. Ask specifically whether you can be assessed for hypermobility using the Beighton score, a quick physical test, and whether your symptoms fit hEDS or HSD criteria. Bring the connections with you: name the fatigue, the dizziness, the digestive issues, and the joint pain as one cluster rather than four separate complaints, because to a clinician who knows this overlap, the cluster is the diagnosis. You are allowed to say: I think these things are related, and I would like them looked at together.
What the overlap means for daily life
Understanding the link does not magically resolve the symptoms, but it changes what you do about them. Pacing becomes a tool rather than a sign of failure: spreading effort across a day so you do not crash protects both your joints and your energy. Joint protection, supportive footwear, and working with a physiotherapist who understands hypermobility can reduce the daily wear. Gentle, progressive strengthening helps the muscles do the stabilising your ligaments cannot, though it has to be paced carefully so you do not flare.
Just as importantly, it gives you permission to stop overriding your body. So much autistic masking is about ignoring your own signals to meet someone else’s expectations. When your body is also hypermobile and dysautonomic, that overriding has a real physical price. Listening to the early signals, resting before you are desperate, and treating your limits as information rather than weakness is not indulgence. It is maintenance.
Key points
- Autism and hypermobility co-occur far more often than chance, with nearly 4 in 10 autistic people meeting hEDS or HSD criteria when properly assessed.
- Hypermobility is rarely just bendy joints; it travels with pain, fatigue, easy bruising, digestive issues, and dizziness because connective tissue is everywhere.
- Interoception differences sit at the meeting point of autism and hypermobility, which helps explain why anxiety and bodily unease are so common in this group.
- Dysautonomia and chronic fatigue are predictable parts of the picture, not laziness or imagination.
- Masking can make you present as calm and fine in medical settings, which is one reason autistic people with hypermobility report worse care.
- Naming your symptoms as one connected cluster, and asking directly about hEDS and HSD assessment, makes you harder to dismiss.
Questions about autism and hypermobility
Is hypermobility more common in autistic people?
Yes. A 2025 systematic review found a consistent and significant association, with joint hypermobility appearing at clearly higher rates in autistic people, and around 39% meeting criteria for hEDS or HSD when clinically assessed rather than self-reported. That is far above the rate in the general population. So if you are autistic and have always had bendy, unstable, or painful joints, you are part of a well-documented pattern, not an outlier. The two are not the same condition, but they overlap often enough that many clinicians now look for one when they find the other.
What is the difference between hypermobility, HSD, and hEDS?
Joint hypermobility just means your joints move beyond the usual range, and on its own it can be harmless. Hypermobility spectrum disorder (HSD) is when that hypermobility comes with symptoms like pain, instability, or fatigue, but does not meet the full criteria for a named syndrome. Hypermobile Ehlers-Danlos syndrome (hEDS) is a specific diagnosis with a defined set of criteria covering joints, skin, family history, and other features. In day-to-day life the distinction can feel academic, because HSD and hEDS can affect you just as much, but the label can matter for getting the right referrals and support.
Why am I so tired all the time if my joints are the problem?
Because hypermobility is rarely only about joints. When your ligaments do not hold you stable, your muscles work overtime all day just to keep you upright and aligned, which is genuinely exhausting. On top of that, many hypermobile people have dysautonomia, where the automatic systems controlling heart rate and blood pressure do not regulate smoothly, leaving you lightheaded and drained. Add an autistic nervous system that is already managing sensory load, and the fatigue stacks. Research has linked joint hypermobility in neurodivergent people directly to this kind of autonomic dysfunction. The tiredness is a real physical cost, not a lack of willpower.
Can hypermobility explain my anxiety?
It can be part of it. Brain imaging research has found that hypermobile people show differences including greater amygdala volume and heightened interoceptive sensitivity, meaning your brain may be reading internal body signals more intensely. When your body sends unusual signals, like a pounding heart on standing, and your brain amplifies them, a baseline of anxiety is an understandable result rather than a personal weakness. This does not mean your anxiety is imaginary or that it is all physical. It means there may be a genuine brain-body mechanism underneath it, which can be a relief to understand and can point towards approaches that actually help.
How do I get assessed for hEDS or HSD?
Start with your GP and ask specifically about hypermobility. A common first step is the Beighton score, a quick physical test of how far certain joints bend. Beyond that, hEDS has formal diagnostic criteria covering your joints, skin, family history, and related symptoms, and a knowledgeable clinician or a referral to rheumatology can work through them. Going in prepared helps: write down your symptoms in advance, mention the full cluster rather than one joint, and say plainly that you would like to be assessed for hypermobility-related conditions. You do not have to downplay anything to seem reasonable.
Why do doctors keep saying my tests are normal?
Because hypermobility and dysautonomia often do not show up on standard bloodwork or scans, which are designed to catch other things. That does not mean nothing is wrong; it means the usual tests are looking in the wrong place. This is a common and frustrating experience, and it is worse for autistic people, who research shows report poorer health experiences partly because masking can make them present as calm and fine. The fix is partly about where you point the investigation: ask about hypermobility assessment and autonomic symptoms directly, and frame your symptoms as a connected pattern so the right specialist gets involved.
Does being autistic change how hypermobility affects me?
The most recent research suggests it can. A 2026 study of over 1,700 adults found that autistic people experienced hypermobility-related conditions differently from non-autistic people, including worse self-rated physical and mental health and more difficulty getting support. Some of that is about interoception and how you experience and report symptoms, and some is about how healthcare systems respond to autistic patients. Practically, it means the support that helps you might look different, and it is worth finding clinicians who understand both the autism and the hypermobility rather than treating them as separate problems handed to separate departments.
What can I actually do to feel better day to day?
Pacing is the biggest lever: spreading your energy and effort across the day so you avoid the crash that comes from pushing through. Gentle, progressive strengthening, ideally guided by a physiotherapist who understands hypermobility, helps your muscles take over some of the stabilising work your ligaments cannot do. Supportive footwear, joint protection, and managing dysautonomia symptoms (for example, hydration and salt strategies discussed with a clinician) can all reduce the daily load. Underneath all of it, learning to stop overriding your body’s signals, a habit many of us built through years of masking, protects both your joints and your energy.