Chronic pain, hypermobility and dysautonomia

Joint hypermobility means joints that move further than usual. It is common on its own, and it sits at the milder end of a range that includes hypermobility spectrum disorder (HSD) and the hypermobile type of Ehlers-Danlos syndrome (hEDS), inherited conditions of connective tissue.^1,2

The strongest single figure comes from Swedish national registers. Among 1,771 people with a diagnosed Ehlers-Danlos syndrome, matched against 17,710 comparison people, an autism diagnosis was 7.4 times as likely (95% CI 5.2 to 10.7).¹ Both the autism and the EDS were recorded diagnoses rather than screening results.

The same study points to a role for family background. It found results in the same direction, though smaller, in a second cohort of 10,019 people with hypermobility syndrome. It also found that the brothers and sisters of people with EDS, who did not have EDS themselves, had higher rates of ADHD, depression and attempted suicide, though not of autism. The authors read that as a sign that some of the risk runs in families rather than coming from the connective tissue itself.¹

A 2025 meta-analysis gathered 20 articles. Pooling the autistic samples, it estimated joint hypermobility in 22.3% of autistic people, rising to 31% when only studies that examined people directly were counted, and HSD or EDS in 27.9%, rising to 39% on examination. Twelve of the 15 studies that tested the association found a significant result. The authors describe the finding as an association that should be confirmed in further research. The pooled figures are one-group estimates, with no comparison against a control group, and the authors describe the studies as heterogeneous.²

Much of this literature is not autism-only, and its authors say so. A UK study of 109 adults with a formal diagnosis of autism, ADHD or Tourette syndrome analyzed them together as one neurodivergent group. It found 51% were hypermobile against 17.5% of a comparison group and a general-population rate the same study puts at about 20%, and 28.4% against 12.5% on an age-specific cut-off.³ Because the three diagnoses were pooled, this study cannot give a figure for autism alone.

In the other direction, a survey of 1,754 adults who all had hEDS or HSD, recruited online, found that about 25% reported a clinician diagnosis of autism and a further 25% had high levels of autistic traits without being autistic. The autistic respondents reported more skin, joint and pain symptoms than the non-autistic group, though they generally did not differ from the high-trait group, and they reported more co-occurring heart, nerve and immune conditions than both other groups. The autistic and high-trait groups rated their physical and mental health as poorer than the non-autistic group. The average wait from first symptoms to diagnosis was nearly 19 years.⁴

Not every study agrees. A school-based study in Sweden examined 207 eleven-year-olds with the Beighton score, a standard test of joint flexibility, and found no link between hypermobility and neurodevelopmental problems at that age. The authors suggest the picture may change with puberty, since the link is seen in adults, and few of the children with hypermobility reported weekly pain.⁵

Pain that lasts or keeps returning is reported more often by autistic people and by people with related neurodevelopmental diagnoses, though most of the evidence comes from surveys rather than clinic-confirmed samples.

In a national Australian cohort, 4,961 young adults aged 18 to 21 answered questions about pain. Recurrent pain was reported by 38% of the young adults the study classed as neurodivergent, meaning they reported autism, ADHD or both, against 27% of their peers. The neurodivergent young adults with pain missed more days of school or work than either neurodivergent young adults without pain or their non-neurodivergent peers with pain, and they reported more distress and more other physical conditions.⁶ The group is defined by self-report rather than by a diagnosis.

In children in the United States, a national survey found chronic pain in 10.3% of those with a neurodevelopmental condition against 5.2% of those without. For autism alone the figure was 9.8%, against 6.0% of children without autism, an adjusted odds ratio of 1.6.⁷ These figures come from parents' reports on a survey, and the children were aged 3 to 17.

Among adults, a case-control study compared 83 people with chronic pain, chronic fatigue or both against 91 people without. Using screening questionnaires rather than diagnoses, it found much higher odds of screening positive for likely autism (adjusted odds ratio 14.3) and likely ADHD (12.9) in the pain and fatigue group. Joint hypermobility accounted for part of the link between the two.⁸

A large chart review of 640 adults seeking autism-related telehealth care sorted them into three groups by their reported health conditions. A majority, 56.3%, reported mostly mental-health conditions, and 26.1% reported few conditions of either kind. The smallest group, 17.7% of the sample, reported both mental-health conditions and a cluster of physical ones that included chronic pain, fatigue, headaches, dizziness and joint problems. The authors read the three groups as a sign that physical and mental conditions can be partly separate rather than always going together.⁹ The records were intake checklists that were not independently checked, and autism was not confirmed by a standard assessment.

A 2025 systematic review of 26 studies found that the abdomen and the head were the most studied pain sites in autistic people, and that the tools used to measure pain were usually completed by a parent or a professional rather than by the person in pain.¹⁰

Pain is a matter of how much it hurts, and also of how it is noticed and described. So far, the experimental evidence shows similar pain responses in autistic and non-autistic adults, with differences in the body's baseline regulation and in who reports the pain.

In a small study of 52 autistic adults assigned female at birth, 65.4% reported pain in the previous 24 hours, with high levels of pain interference in daily life and high pain-related anxiety.¹¹ The sample was small, reported on itself, and had no comparison group.

One experimental study measured heart-rate variability, a signal of the autonomic nervous system, in 49 autistic adults and 39 non-autistic adults while they received a painful stimulus. The autistic group had lower resting vagal tone, a measure of the body's calming branch, but they responded to the pain in much the same way as the comparison group, and the study found no overall link between vagal tone and the pain ratings. Within the autistic group only, a higher resting vagal tone went with lower pain ratings.¹² The autistic participants all had level 1 support needs and an IQ above 80.

How pain is measured matters here. In the 26 studies in the 2025 systematic review, the tools were usually filled in by a parent or a professional, and only one study asked the autistic person directly.¹⁰ Whether that changes what the studies find is not known.

The autonomic nervous system runs the body's automatic jobs, such as heart rate and blood pressure. When it works differently, the result can be dizziness or faintness on standing, a racing heart, or trouble with temperature. Postural orthostatic tachycardia syndrome (POTS) is one form, defined by a jump in heart rate on standing without a fall in blood pressure.¹³

The clearest evidence for POTS in autistic adults comes from a UK clinical series. Over 2007 to 2017, two national autonomic referral centers evaluated 28 autistic adults, of average age 29. Twenty of them had a diagnosable autonomic condition, most often POTS, and 16 of those 20 also had hEDS.¹³ People are referred for testing because a doctor already suspects a problem, so a series like this cannot say how common POTS is across autistic adults.

The same UK study that found high hypermobility in a neurodivergent group also found that the group reported more symptoms of orthostatic intolerance, the dizziness and racing heart that come with standing, than the comparison group.³

Two reviews of heart-rate variability, a common way to estimate autonomic function, report differences in autistic children and adolescents. A 2026 review of 24 studies found that autism studies most often showed altered vagally mediated heart-rate variability, while ADHD studies more often showed changes that depended on the task, and it reports wide differences between studies in how the recordings were handled.¹⁴ A second review of 34 studies covered autistic people who also had a developmental delay or intellectual disability, with an IQ below 75, and whose average age was about 11. It reported more sympathetic activity, less parasympathetic activity, and slower recovery after stress, and the authors rated most of the evidence as low certainty.¹⁵

No study found as of October 2026 has measured how common POTS is in a sample of adults recruited on clinician-diagnosed autism.

Headache and migraine are reported more often by autistic people in both a national child survey and a large hospital record system.

In the 2021 US National Survey of Children's Health, frequent or severe headache was reported in 7.1% of autistic children against 3.0% of non-autistic children.¹⁶ In the UCLA health system's electronic records, which cover all ages from 1979 to 2023, a migraine diagnosis was recorded in 3.1% of autistic patients against 2.0% of non-autistic patients. The autistic patients with migraine averaged about 27 years old.¹⁶ Both sets of figures come from the same research team and the same paper.

Among the autistic people who had headache or migraine, the study found higher odds of several other difficulties: being bullied, being a victim of violence, poor general health, anxiety, depression and concussion.¹⁶ These are associations in one set of records, and most of the figures come from the child survey, so they do not show which came first.

Hypermobility, autonomic symptoms and pain often turn up in the same people, and one proposal is that the connective tissue itself is part of the reason. Connective tissue is the material that holds joints and organs together, and it also forms part of the scaffolding around nerves.

Three studies by the same research group, all cross-sectional, tested whether hypermobility statistically accounts for part of the link. In the UK neurodivergent sample, the number of hypermobile joints accounted for part of the association between neurodivergence and both dysautonomia and pain symptoms.³ In the chronic pain and fatigue study, joint hypermobility accounted for part of the link between likely neurodivergence and the pain condition.⁸ In a third study, 99 adults who were hypermobile and also had significant anxiety were tested; none had a formal neurodevelopmental diagnosis. About half screened above the autism threshold, and autonomic reactivity accounted for part of the link between the number of connective-tissue features and neurodivergent traits.¹⁷

A narrative review has proposed a specific molecular route, through a cell-signaling pathway called WNT/β-catenin and an enzyme, MMP-9, that breaks down connective tissue.¹⁸ That paper proposes a hypothesis and reports no data of its own.

Autistic writers often treat chronic pain and hypermobility as part of a larger pattern of conditions that arrive together, and as conditions that go unrecognized. Daniel Burford lists hypermobility and POTS among the labels that late-diagnosed autistic people collect, writing that "autistic adults have hypermobility at markedly higher rates than non-autistic adults", and adding that "nobody has established how common it is in autistic people specifically".^c1 Pete Wharmby names Ehlers-Danlos syndrome as a common condition that causes pain and discomfort.^c2 Megan Anna Neff writes that ignoring her limits makes her "susceptible to burnout and chronic health conditions".^c3

Several writers describe pain that is felt and shown differently. Luke Beardon writes that "the processing of pain is very often qualitatively different" for autistic people, with both under-sensitivity and over-sensitivity.^c4 Colin, writing in Alex Ratcliffe's collection of adult accounts, describes waiting 15 years to have chronic back pain looked at again after being dismissed by doctors.^c5 Donna Henderson, Sarah Wayland and Jamell White, in a guide for clinicians, report a neurologist's view that migraines are "grossly underdiagnosed because people who get them don't often know".^c6