What Is Hypermobility Spectrum Disorder? Symptoms, HSD vs. EDS and the Autism Link
What is hypermobility spectrum disorder? Learn HSD symptoms, how it differs from EDS, how it is diagnosed and how it links to autism.
Hypermobility spectrum disorder (HSD) is a diagnosis for people whose joints move beyond the usual range and cause symptoms such as pain, instability or fatigue. It applies when the person does not meet the criteria for hypermobile Ehlers-Danlos syndrome (hEDS) or another condition. A clinician diagnoses it from history and an exam, after ruling out other causes.
A seven-year-old shows off by bending her thumb back to touch her forearm. By evening her legs hurt, she is too tired for the park, and she pulls at the tag on her shirt until she cries. Is that just a flexible kid, or something more? Bendy joints are common and often harmless. When they come with pain, instability or exhaustion, clinicians may diagnose hypermobility spectrum disorder (HSD). For autistic children the picture is harder to read, because pain and fatigue can be hard to tell apart from tactile defensiveness or other sensory sensitivities. This guide explains what HSD is, its symptoms, how it differs from Ehlers-Danlos syndrome (EDS), how it is diagnosed, what research says about the autism link, and whether it counts as a disability.
What Is Hypermobility Spectrum Disorder?
Hypermobile joints move beyond the usual range, like a thumb that bends back to the wrist or elbows that bend backward. Many people have them with no problems at all. Having bendy joints is not a disorder by itself. A person is diagnosed with HSD only when the hypermobility is causing problems, such as pain, instability or injury, and other conditions have been ruled out (Ehlers-Danlos Society).
HSD is a "catch-all" diagnosis in a specific sense. It covers people with symptomatic joint hypermobility who do not meet the criteria for hypermobile Ehlers-Danlos syndrome (hEDS) or another specific condition. Clinicians describe several patterns: generalized (many joints), peripheral (hands and feet), localized (one joint or area) and historical (past generalized hypermobility without current signs). Older labels such as "joint hypermobility syndrome" and "EDS type III" should no longer be used.
How common is it? Nobody knows exactly, because many people are never diagnosed. Generalized hypermobility appears in about 4 to 11% of children aged 3 to 19 in student samples, according to a review in American Family Physician. Diagnosis is far rarer. In Wales in 2016 and 2017, 194.2 per 100,000 people (about 1 in 500) had a diagnosis of EDS or joint hypermobility syndrome, and 70% of them were women.
Women were diagnosed, on average, 8.5 years later than men, and 72% of men were diagnosed in childhood compared with 41% of women (Demmler et al.). Swedish and Welsh registry data put combined diagnosed rates between 0.13% and 0.19%, and the true rate of HSD and hEDS may be lower than that.
Hypermobility Spectrum Disorder Symptoms
HSD symptoms vary a lot from person to person. According to the review above, common problems fall into these groups:
- Joints and muscles: chronic or recurring joint pain, frequent dislocations or partial dislocations (shoulder, knee and hip are most common), fibromyalgia-like pain and early arthritis
- Skin and tissue: soft or velvety skin, easy bruising, thin scars and hernias
- Whole-body symptoms: fatigue, anxiety, depression, dizziness or fainting when standing (orthostatic intolerance, including POTS), digestive problems, and pelvic or bladder problems
- Neurologic: headaches and migraines, sleep problems and trouble concentrating
Some of these show up in autistic children for other reasons, which makes them easy to misread. Our guides to autism and migraines and bedwetting in autistic children explain why a medical check is part of the picture. If your child has several of these symptoms, bring a list to the pediatrician.
Hypermobility Spectrum Disorder vs. EDS: What's the Difference?
Hypermobility spectrum disorder vs EDS is a common point of confusion, because HSD and hEDS overlap so much that experts disagree about whether they are one condition on a spectrum, two separate conditions, or something in between. Here is how they are defined today.
HSD | hEDS | |
What it is | Symptomatic hypermobility that does not meet hEDS criteria or another diagnosis | One of the EDS subtypes, diagnosed with a specific 2017 checklist |
Main features | Mostly joint and muscle symptoms, sometimes with fatigue or other body-wide problems | Generalized hypermobility plus connective tissue features, family history or joint complications |
Genes | No identified gene | The only EDS subtype without an identified gene |
Can it change? | Yes. A person who later meets hEDS criteria is re-diagnosed with hEDS | Treated as lifelong |
Children | Can be diagnosed (see the pediatric framework below) | Under the 2023 pediatric framework, a child who has not reached puberty cannot be diagnosed with hEDS |
Management | The same principles for both, per the Ehlers-Danlos Society | The same |
The 2017 hEDS checklist has three parts. First, generalized hypermobility on a Beighton score. Second, at least two of three features: five or more body-wide signs of a connective tissue disorder (such as soft skin, stretch marks, hernias or mitral valve prolapse), a first-degree relative who meets the criteria, or a musculoskeletal complication such as chronic pain or recurring instability. Third, no other condition that explains the findings.
How Is HSD Diagnosed?
There is no blood test or scan that confirms HSD or hEDS. Diagnosis is clinical, based on history, a physical exam and ruling out other conditions. A good starting point is this hEDS and HSD review in American Family Physician, which describes the usual steps.
- The Beighton score. This is a test of joint flexibility scored from 0 to 9, with one point for each of nine movements. Under the 2017 criteria, a score of 5 or more counts as generalized hypermobility from biologic maturity up to age 50, and 4 or more after age 50. If a person falls one point short, a validated five-part questionnaire can be used.
- Children are assessed differently. A 2023 pediatric framework applies from age 5 until biologic maturity. It uses a Beighton cutoff of 6 or more, because children are typically more flexible, and sorts children into categories that can change as they grow. Young people should be re-assessed with the adult criteria at maturity.
- Other conditions are ruled out. The list includes other EDS types, Marfan syndrome, Loeys-Dietz syndrome, skeletal dysplasias and muscle disorders. A screening heart ultrasound is recommended when hEDS is suspected, and genetic testing when another syndrome is possible.
Your child's pediatrician or primary care clinician is the right first stop. They can refer to genetics or another specialist when the picture is unclear.
Is Hypermobility Linked to Autism?
Research suggests an association, but it is not settled, and it is not a diagnostic sign in either direction. Here is what the main studies found.
Study | Who was studied | What it found | Limit to keep in mind |
Glans et al. (2022), Frontiers in Psychiatry | 199 autistic adults and 419 non-autistic adults in Sweden | Hypermobility on exam: 28.0% vs. 11.0% in women, 10.7% vs. 4.7% in men (not statistically significant in men). The odds of symptomatic hypermobility were about 4.9 times higher in autistic adults | 69% of the autistic group also had ADHD, and most were recruited from specialist clinics |
Csecs et al. (2022), Frontiers in Psychiatry | 109 neurodivergent adults (autistic, or with ADHD or Tourette syndrome) and 57 comparison adults | About 28% vs. about 12% met age-specific hypermobility cutoffs. Pain and dizziness symptoms were higher and tracked with hypermobility | Small sample, and the comparison group was not screened |
Cederlöf et al. (2016), BMC Psychiatry | Swedish national registers | Autism was diagnosed in 2.9% of people with EDS vs. 0.4% of matched peers. For hypermobility syndrome it was 1.6% vs. 1.2% | Diagnoses were not verified, and there were no Beighton scores |
Baeza-Velasco et al. (2025), Autism | Pooled hypermobility in autistic people: 22.3%, or 31% when checked clinically. HSD or EDS: 27.9%, or 39% clinically | The studies varied widely and the authors call for more research | |
Gothenburg-area study (2025), BJPsych Open | 223 school children, age 11 | No significant link between flexibility and autism, ADHD, coordination problems or pain | Small, one region, a single age group |
Three takeaways. First, the strongest findings come from adults, and the figures swing a lot depending on who was recruited and how hypermobility was measured. Second, the one population study of children did not find a link at age 11, and its authors say flexibility should not be used as an early marker for autism or ADHD.
They suggest puberty may change the pattern. Third, none of this shows that one causes the other. The Swedish registry study found raised autism rates in siblings of people with hypermobility syndrome, which points to shared genetic or early-life factors, not cause and effect.
Two patterns are worth knowing about. ADHD is common in these samples, and our guide to autism and ADHD overlap explains why clinicians look at both. And hypermobility looks more common in women, which fits with what we see in our guide to autistic women diagnosed late.
Is Hypermobility Spectrum Disorder a Disability?
Short answer: Not automatically. No law lists HSD as a disability. Whether it counts depends on how much it limits a person's daily life, school performance or ability to work, and each system uses its own test. A diagnosis helps, and so does documentation of how symptoms affect function.
System | The test in plain terms |
ADA (adults, work and public life) | A physical or mental impairment that "substantially limits" a major life activity. Federal regulations say this is not meant to be a demanding standard. The limit is judged without counting the help of treatment, and a condition that flares up counts if it would substantially limit a major life activity when active. Walking, standing, lifting and bending are listed as major life activities |
Section 504 (schools and programs that get federal funding) | A physical impairment that substantially limits a major life activity. The regulation names conditions of the muscular and skeletal systems and lists walking and studying |
IDEA (special education) | The child needs special education because of an impairment that adversely affects educational performance. Other health impairment covers "limited strength, vitality, or alertness" from a chronic health problem. A child who needs only a related service and not special education does not qualify under IDEA |
Social Security | The musculoskeletal rules name hypermobility as a form of abnormal joint motion. Listing 1.18 requires chronic joint pain or stiffness, abnormal motion or instability, an abnormality seen on exam or imaging, and a limitation lasting at least 12 months that meets the listing's specific tests. Pain alone is not enough |
For a school-age child, the practical route is usually a request for an evaluation and a written plan. Our guides to 504 plans and IEPs and creating an IEP explain what each one covers. If your child is autistic, the school may evaluate under the autism category, and you can still ask the team to consider hypermobility-related needs such as shorter writing tasks, rest breaks or physical therapy.
Treatment and Support for HSD
HSD cannot be cured. For some people, symptoms fade over time, some stay the same and some progress to hEDS. Care focuses on managing symptoms, preventing injury and educating the person. A multidisciplinary team may include physicians, physical and occupational therapists, psychologists and, for some people, an orthotist. Options described in the review include:
- Physical therapy focused on strengthening, joint awareness (proprioception) and joint protection
- Pain relief such as acetaminophen or NSAIDs, heat or cold, ergonomic changes, massage and bracing or taping, as advised by a clinician
- Low-impact exercise, good sleep and healthy weight
- For dizziness on standing: more fluids and salt, and compression stockings, when a clinician recommends them
- Psychological support. Pain programs that include cognitive behavioral therapy reduced anxiety, depression and fear of movement in small studies
Be realistic about the evidence. The authors of that review rated most recommendations as based on expert opinion or case series, and they found no relevant Cochrane reviews or guidelines in their search. Treat these as options to discuss with your child's clinician, not a plan to start on your own.
How ABA Fits When a Child Is Autistic and Hypermobile
ABA does not treat or diagnose HSD. A BCBA's role is to support daily skills and to make sure physical discomfort is not misread as behavior. In a team that includes a pediatrician and a physical or occupational therapist, ABA can help in these ways:
- Teaching a way to say "this hurts." A picture card, a gesture or a simple phrase for pain, tiredness or "I need a break."
- Looking for a physical reason first. A child who refuses to walk, sit on the floor or hold a pencil may be in pain. Sudden changes in behavior deserve a medical check, and our guide to autism meltdowns covers what else to look at.
- Adjusting demands. Shorter fine motor tasks, a chair with support, frequent breaks and a plan for rest after activity.
- Following the therapist's lead. Using the exercises and joint protection tips from physical or occupational therapy during sessions, and not pushing a child into positions that hurt.
- Tracking patterns. Noting when pain behaviors happen, so the medical team has more than "it hurts sometimes."
Frequently Asked Questions
Q: Does hypermobility go away with age?
A: Not necessarily. For people with HSD, symptoms may resolve, persist or progress to hEDS, and it is hard to predict which will happen. The 2023 pediatric framework treats a child's category as changeable and recommends re-assessing at maturity.
Q: Is there a test for HSD or hEDS?
A: No test confirms either one. Genetic testing is used to look for other conditions when something suggests a different syndrome, because hEDS is the only EDS type without an identified gene. A heart ultrasound is also recommended when hEDS is suspected, to check for related heart findings.
Q: Who diagnoses HSD?
A: Most families start with a pediatrician or primary care clinician, who can examine joints, take a history and refer to genetics or another specialist if the picture is unclear. Because HSD overlaps with other conditions, it can take more than one visit.
Q: Should I tell my child's school and ABA team about hypermobility?
A: Usually yes, if you are comfortable sharing it. Teachers and therapists can then plan around pain, fatigue and injury risk and notice when a change in behavior may be physical. You decide how much to share, and a note from the doctor helps.
Ready to Talk About ABA Therapy?
If your child's pain, tiredness or movement differences are making school, play or therapy harder, you do not have to untangle it alone. Our team can listen, help build routines that protect your child's body and work alongside your child's doctors and therapists. Contact us, start with enrollment, or call 888-690-0663. You can also learn about in-home ABA therapy and ABA parent training, or visit Apex ABA to see where we serve families in North Carolina, Georgia and Maryland.
Sources
- Yew, K. S., Kamps-Schmitt, K. A., and Borge, R. (2021). Hypermobile Ehlers-Danlos Syndrome and Hypermobility Spectrum Disorders. American Family Physician, 103(8), 481-492: https://www.aafp.org/pubs/afp/issues/2021/0415/p481.html
- Ehlers-Danlos Society, What is HSD?: https://www.ehlers-danlos.com/what-is-hsd/
- Ehlers-Danlos Society, 2023 diagnostic framework for pediatric joint hypermobility: https://www.ehlers-danlos.com/new-diagnostic-framework-for-pediatric-joint-hypermobility/
- GeneReviews, Ehlers-Danlos Syndrome, Hypermobile Type (2017 hEDS criteria and Beighton thresholds): https://www.ncbi.nlm.nih.gov/books/NBK1279/
- Demmler, J. C., et al. Diagnosed prevalence of Ehlers-Danlos syndrome and hypermobility spectrum disorder in Wales, UK. BMJ Open: https://bmjopen.bmj.com/content/9/11/e031365
- Glans, M. R., et al. (2022). The relationship between generalised joint hypermobility and autism spectrum disorder in adults. Frontiers in Psychiatry, 12: https://pmc.ncbi.nlm.nih.gov/articles/PMC8861852/
- Csecs, J. L. L., et al. (2022). Joint hypermobility links neurodivergence to dysautonomia and pain. Frontiers in Psychiatry, 12: https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2021.786916/full
- Cederlöf, M., et al. (2016). Nationwide population-based cohort study of psychiatric disorders in individuals with Ehlers-Danlos syndrome or hypermobility syndrome and their siblings. BMC Psychiatry, 16, 207: https://bmcpsychiatry.biomedcentral.com/articles/10.1186/s12888-016-0922-6
- Baeza-Velasco, C., et al. (2025). Autism in the context of joint hypermobility, hypermobility spectrum disorders, and Ehlers-Danlos syndromes: a systematic review and prevalence meta-analyses. Autism, 29(8), 1939-1958: https://journals.sagepub.com/doi/abs/10.1177/13623613251328059
- University of Gothenburg, study finds no link between joint hypermobility, pain and neurodevelopmental disorders in children (reporting a 2025 BJPsych Open paper): https://www.gu.se/en/news/study-finds-no-link-between-joint-hypermobility-pain-and-neurodevelopmental-disorders-in-children-0
- ADA.gov, Introduction to the ADA: https://www.ada.gov/topics/intro-to-ada/
- 29 CFR 1630.2, definitions (substantially limits, mitigating measures, episodic conditions, major life activities): https://www.law.cornell.edu/cfr/text/29/1630.2
- 34 CFR 104.3, Section 504 definitions: https://www.law.cornell.edu/cfr/text/34/104.3
- 34 CFR 300.8, IDEA definition of a child with a disability and other health impairment: https://www.law.cornell.edu/cfr/text/34/300.8
- Social Security Administration, Disability Evaluation Under Social Security, Section 1.00 Musculoskeletal Disorders (Listing 1.18): https://www.ssa.gov/disability/professionals/bluebook/1.00-Musculoskeletal-Adult.htm
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