The Trifecta: Ehlers Danlos (hEDS/HSD), POTS, MCAS, and Autism or ADHD: Can They Show Up Together? Why the Trauma of Being Dismissed Belongs in the Assessment

Raven LeFebvre, LCSW, LCSW-C, LICSW, CCTP-II

15 hours ago

8 min read

Written by: Raven LeFebvre, LCSW, LCSW-C, LICSW, MAC, CCTP-II

Owner and Founder, Silhouette Psychotherapy PLLC

Certified Clinical Trauma Professional Level 2 (CCTP-II)

PDA North America Level 1 Certified Clinician

Original Publication Date 10/23/2026

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Raven's clinical practice is grounded in an anti-oppression and liberation-oriented therapeutic frame, recognizing that emotional, cognitive, and nervous system wellbeing cannot be understood apart from the social, relational, cultural, and systemic environments in which people live. This orientation emphasizes autonomy, self-determination, critical consciousness, and the right of clients to understand their experiences within the broader contexts of power, marginalization, identity, and relational conditioning. Her work considers how oppressive systems, interpersonal dynamics, internalized beliefs, and histories of adaptation can shape the ways people understand themselves and navigate relationships. She is collaborative, with intent to support greater agency, self-trust, authenticity, and freedom from patterns that require self-erasure in order to belong.

The Trifecta: Ehlers Danlos (hEDS/HSD), POTS, MCAS, and Autism or ADHD: Why They Show Up Together, and Why the Trauma of Being Dismissed Belongs in the Assessment

The short answer: Hypermobility conditions like Ehlers-Danlos syndrome (EDS), autonomic conditions like POTS, and mast cell conditions like MCAS appear more often in autistic and ADHD people than chance would predict. Separately, many people with these conditions have been dismissed, disbelieved, and told their symptoms were psychological. In cases where there are significant and actual underlying medical conditions and syndromes, that treatment is relationally and structurally traumatic for many neurominority adults, and a thorough autism or ADHD assessment needs to account for it.

Key Takeaways: The Trifecta: Ehlers Danlos (hEDS/HSD), POTS, MCAS, and Autism or ADHD

Research consistently links hypermobility conditions with autism and ADHD. Links with POTS are growing, and evidence for MCAS is the earliest-stage of the three. POTS and MCAS are known as established comorbidities of connective tissue disorders.
The studies show association, not cause. Nobody knows yet why the conditions travel together.
Being dismissed, disbelieved, and gaslit can cause trauma. Studies document this in EDS and POTS, and it falls disproportionately on women - indicating medical misogyny.
Trauma from medical care can resemble or mask autism and ADHD traits, including hypervigilance, avoidance, distrust, and shutdown.
A trauma-informed assessment does not receive testimony from the client about their lived experienced as something to be inspected for credibility or lack thereof, but rather, believes the person speaking about their lived experience, believes their account of their physical symptoms as trustworthy since it originates from Self, records the history of dismissal, and separates the layers carefully.

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What the Research Shows About the Overlap

Hypermobility, EDS, and Autism

The connection between joint hypermobility and autism has the strongest evidence. A systematic review in Autism (2025) examined 15 studies of the association and found that 12 reported significant results. Across studies, about 28% of autistic samples had a hypermobility spectrum disorder or EDS, rising to 39% when clinicians assessed for it directly [2]. The authors called for more research to confirm the pattern, but the direction is consistent with earlier work [1].

Hypermobility, EDS, and ADHD

A Swedish national registry study matched 1,771 people with EDS to 17,710 comparison individuals and found higher risks of psychiatric diagnoses, including ADHD. Siblings of people with EDS also showed raised ADHD risk (relative risk 2.1), which points toward shared genetic or early-life factors [4]. A clinic-based study of children with hypermobility spectrum disorder or hypermobile EDS found that 16% had a verified ADHD diagnosis and another 7% were being evaluated, and the authors recommended routine neuropsychiatric screening for these children [3]. The Trifecta: Ehlers Danlos (hEDS/HSD), POTS, MCAS, and Autism or ADHD and the connection and intersectionality has been explored in multiple studies.

Ehlers Danlos (hEDS/HSD), POTS, MCAS, and Autism or ADHD - Zebra rolling on its back - Zebra is symbol for hEDS/HSD

A Larger Picture

In a study of neurodivergent adults, generalized joint hypermobility was found in about 51%, compared with roughly 20% in the general population, and hypermobility was tied to dysautonomia and pain [5]. A 2026 analysis of health-system records found that patients with autism only were 311% more likely to have a heritable structural connective tissue disorder and 203% more likely to have a hypermobility spectrum disorder, compared with patients with no neurodevelopmental diagnosis. For ADHD only, the figures were 170% and 148%, and the association was strongest in people with both. The analysis measured correlation, not causation or direction [6].

POTS and MCAS

POTS, a form of dysautonomia, frequently appears alongside hypermobility, and the 2022 and 2026 studies above include autonomic dysfunction and MCAS among the conditions that cluster with autism and ADHD [5, 6]. The evidence for POTS and MCAS specifically is thinner than for hypermobility and EDS, so treat it as emerging, not settled.

Why This Matters for Assessment: Overlap That Looks Like Something Else

Even without trauma, these conditions complicate an autism or ADHD evaluation:

Fatigue and brain fog can look like inattention.
Racing heart, shortness of breath and shakiness in POTS can look like anxiety.
Pain and sensory overload can intensify sensory sensitivity and shutdown.
Social withdrawal from chronic illness can look like social difficulty.

An assessor who does not understand the physical conditions can misread a medical symptom as a psychological one, or the reverse.

The Trauma Is the Dismissal, Not the Condition

Having EDS, POTS, or MCAS does not itself cause trauma. What causes it is how many people are treated while seeking answers.

Being told it's psychological. In a survey of 4,835 people with POTS, 77% had been told by a physician that their symptoms were psychological or psychiatric, while only 28% had a pre-existing psychiatric condition. Three-quarters reported being misdiagnosed along the way, and the median delay to diagnosis was 24 months [7]. A 2025 registry study from Australia found that women waited an average of 7.0 years for a POTS diagnosis, compared with 3.8 years for men [8].

Medical misogyny. This is not new or limited to one condition. A landmark 2001 analysis found that women report more severe, more frequent, and longer-lasting pain than men, yet are often treated less aggressively until they prove how sick they are [10]. A 2018 review of 77 studies concluded that gender bias shapes the patient-provider encounter and treatment decisions in chronic pain, including pain being discounted as psychological [11].

What that does to people. In a qualitative study of 26 people with hypermobile EDS, researchers described a specific form of medical trauma they called clinician-associated traumatization. Participants described intense psychological and physical distress arising from hostility and disinterest they perceived in their clinicians, and the trauma symptoms resembled those of PTSD: hyperarousal, avoidance, numbing, and flashbacks. One woman was diagnosed with complex PTSD by her psychologist because of how she had been treated in clinic [9].

This is trauma. Calling it "bias" understates what it does to the person who lived it.

Why the Trauma Belongs in an Autism or ADHD Assessment

There are four reasons a thorough assessment should ask about it.

It can look like autism or ADHD. Hypervigilance, avoidance, distrust of professionals, shutdown, and difficulty with closeness overlap with autistic and ADHD traits, so an assessor who does not ask about this history can attribute trauma responses to neurotype, or the reverse.
It can hide autism and ADHD. Years of being disbelieved can lead people to downplay their experience, mask more, and say less in an evaluation.
The assessment itself can repeat the harm. A person who has been told repeatedly that their symptoms are imagined will notice quickly if an assessor does the same. Disbelief, even subtle, can end the work.
Accurate answers depend on separating the layers. Neurodivergence, physical illness, hormonal factors, and trauma can all be present, and treatment differs for each.

The research on how medical trauma interacts with autism and ADHD diagnosis specifically is still sparse, so this reasoning draws on the trauma, EDS, and POTS literature above and on clinical practice, not on a direct body of evidence.

What a Trauma-Informed Assessment Looks Like

It believes the physical symptoms and does not treat them as anxiety or as part of autism or ADHD.
It asks about the medical history, including the diagnostic journey and how clinicians responded.
It screens for trauma responses, including those tied to medical care, and keeps them separate from neurodevelopmental history.
It looks at hormonal and physical factors, including cycles, perimenopause, and conditions such as EDS, POTS, and MCAS.
It coordinates with medical providers and does not diagnose EDS, POTS, or MCAS itself. Those need medical evaluation.
It explains its reasoning in the written report so you can see how each layer was weighed.

Frequently Asked Questions

Is EDS linked to autism and ADHD? The Trifecta: Ehlers Danlos (hEDS/HSD), POTS, MCAS, and Autism or ADHD

Yes. Multiple studies find hypermobility conditions more common in autistic and ADHD people. The research shows association, not cause [2, 3, 4, 6].

Is POTS linked to autism or ADHD?

The evidence is growing but is less developed than for hypermobility. Autonomic dysfunction shows up more often in neurodivergent people in several analyses [5, 6].

Is there research linking MCAS and autism?

MCAS has been included in recent large analyses alongside other conditions, but the evidence is the earliest-stage of the three and should be treated as emerging [6].

Do EDS, POTS, or MCAS cause trauma?

No. The trauma comes from being dismissed, disbelieved, or gaslit about the condition, which many people experience while seeking diagnosis. Research on EDS describes it as clinician-associated traumatization, with PTSD-like symptoms [9].

Can medical trauma look like autism or ADHD?

It can. Hypervigilance, avoidance, distrust, and shutdown overlap with autistic and ADHD traits, which is why a thorough assessment asks about this history.

Why are women dismissed more often?

Research documents gender bias in pain treatment and in how women's symptoms are interpreted, including being attributed to psychological causes. Women with POTS wait longer for diagnosis than men [8, 10, 11].

Will an assessment tell me whether I have EDS, POTS, or MCAS?

No. Those need medical evaluation. A good assessment can recognize the pattern, explain how the conditions interact with neurodivergence, and point you toward the right medical follow-up.

The Bottom Line

EDS, POTS, and MCAS appear alongside autism and ADHD more often than chance, and the research is still working out why. For many people, the harder part of the story is how they were treated while looking for answers. Being dismissed and told it was psychological is traumatic, and an assessment that ignores it can misread the picture. If you want a clinician who takes the physical, hormonal, and trauma layers seriously, we can help.

Ready to talk? Request an evaluation with Silhouette Psychotherapy PLLC