1. The evidence
- 30-50% of autistic adults have hypermobile features (vs 10-15% general population)
- Hypermobile populations have elevated autism rates (bidirectional)
- Pattern consistent across multiple studies
- Often missed because rheumatology and autism services don’t cross-reference
2. What hypermobility is
Connective-tissue difference where collagen is more flexible. Visible feature is joint hypermobility, but the underlying tissue difference affects skin, gut, blood vessels, autonomic nervous system, and proprioception.
Spans from asymptomatic loose-jointedness through hypermobility spectrum disorder (HSD) to hypermobile Ehlers-Danlos syndrome (hEDS) which has more systemic features.
3. Why they co-occur
- Shared collagen genes affecting both connective tissue and brain development
- Autonomic nervous system overlap
- Proprioception differences in both conditions
- Sensory processing overlap (some hypermobile features have sensory consequences)
- Shared genetic substrate connecting connective tissue and neurodevelopment
4. The collagen substrate
Collagen is a structural protein found throughout the body including the brain. Connective-tissue differences may also affect brain structure and neurotransmitter signalling. This theory is plausible and partially supported but not definitively established.
5. Proprioception overlap
Proprioception is the sense of body position in space.
- Hypermobile adults often have reduced proprioception (loose joints provide less feedback)
- Autistic adults often have sensory processing differences including proprioception
- Many autistic adults seek deep pressure for sensory regulation
- Many hypermobile adults benefit from deep pressure for proprioceptive support
- The two needs overlap and reinforce each other
6. The POTS connection
Postural orthostatic tachycardia syndrome co-occurs with hypermobility (30-60% of hEDS adults have POTS) and with autism. The triple overlap is well-documented.
POTS symptoms:
- Heart rate jumping on standing
- Dizziness or lightheadedness
- Brain fog
- Fatigue
- Sometimes fainting
Treatment includes hydration, salt, compression garments, and sometimes medication (guanfacine is one option that also treats ADHD).
7. MCAS and the triad
Mast cell activation syndrome also clusters with hypermobility and POTS. The triad (hEDS + POTS + MCAS) is increasingly recognised, sometimes alongside autism. MCAS produces allergic-type symptoms (hives, flushing, gut symptoms, brain fog) often without obvious triggers. Worth investigating with an immunologist familiar with the syndrome if unexplained allergic-type symptoms are present.
8. AuDHD and the compound picture
AuDHD adults (autistic + ADHD) often have hypermobility too. The triple ND profile + hypermobility produces particularly complex presentations and treatment needs. Integrated care is hard to find but worth seeking.
9. Chronic fatigue overlap
Many autistic adults with hypermobility have substantial chronic fatigue from:
- Pain-driven energy depletion
- POTS-driven cognitive load
- Masking-driven autistic burnout
- Sensory overload
- Sleep difficulties common in both conditions
The fatigue is real and substantial — not laziness, not deconditioning that exercise will fix.
10. Getting assessed
Beighton score (9-point physical assessment) is a quick screen any GP can do. Worth assessing if:
- Joint hypermobility (bendy joints)
- Chronic joint pain
- Frequent sprains or dislocations
- Dizziness on standing (POTS)
- Gut issues
- Stretchy/soft skin
- Family hypermobility history
If positive screening, referral to rheumatology or a hypermobility-specialist clinician for fuller assessment.
11. Physiotherapy for hypermobile autistic adults
Strength training adapted for hypermobile bodies is the foundation of hypermobility management. Need:
- Physiotherapist familiar with hypermobility (regular gym programmes can hurt)
- Slow progressive strengthening
- Proprioception work
- Joint stabilisation rather than stretching
For autistic adults, finding a sensory-aware physiotherapist matters. The treatment room and the physical handling can be sensorily challenging.
12. Sensory and physical overlap
The autism sensory profile and hypermobile body interact:
- Tactile sensitivity to clothing can affect compression garment tolerance
- Proprioception-seeking from autism can be combined with proprioception-needing from hypermobility
- Deep pressure helps both
- Weighted blankets, compression clothing, sustained physical contact serve both needs
13. Pacing as protection
For autistic adults + hypermobility, pacing is essential. Pushing through fatigue produces post-exertional crashes that can last days. Pacing means:
- Working within energy envelope
- Building in recovery time
- Limiting high-energy days
- Tracking patterns over time (the Pro tracker helps)
- Accepting that you can’t maintain non-disabled pace
14. Finding integrated care
Hard but worth seeking:
- Rheumatologist or hypermobility specialist who understands ND
- Autism-aware GP
- Physiotherapist familiar with hypermobility
- Cardiologist if POTS is present
- Pain management if needed
- Mental health support that addresses chronic illness alongside autism
15. Frequently asked questions
Are autism and hypermobility actually connected?
Yes, the connection has accumulated solid evidence in the last decade. Research consistently shows autistic adults have substantially elevated rates of joint hypermobility — some studies suggest 30-50% of autistic adults have hypermobile features, compared to roughly 10-15% in the general population. The reverse is also true: adults with hypermobility spectrum disorder or hEDS have elevated autism rates. The connection is real and worth knowing if you have either condition.
Why might autism and hypermobility co-occur?
Several theories with partial evidence. Shared collagen genes that affect both connective tissue and brain development. Autonomic nervous system dysfunction common in hypermobility may share substrate with sensory processing differences in autism. Proprioception differences (reduced sense of where body is in space) in hypermobility overlap with sensory differences in autism. Genetic factors connecting connective tissue and neurodevelopment. The likely answer involves several mechanisms rather than a single cause.
What is hypermobility spectrum disorder?
A connective-tissue difference where collagen is more flexible than typical. The visible feature is joint hypermobility (joints that bend further than normal), but the underlying tissue difference affects skin, gut, blood vessels, autonomic nervous system, and proprioception. Spans from asymptomatic ’looser than average’ through hypermobility spectrum disorder (HSD) to hypermobile Ehlers-Danlos syndrome (hEDS) which has more systemic features.
What is POTS and how does it relate?
Postural orthostatic tachycardia syndrome — autonomic dysfunction where standing triggers abnormally fast heart rate, dizziness, brain fog. POTS is much more common in hypermobile populations (30-60% of hEDS adults). POTS also co-occurs with autism at elevated rates. The triple overlap — autism + hypermobility + POTS — is well-documented and worth knowing about because the symptoms compound (the brain fog from POTS plus sensory overload from autism plus joint pain from hypermobility creates substantial functional load).
I’m autistic and have joint pain — should I get hypermobility assessed?
Yes, if other patterns fit. The Beighton score (9-point physical assessment) is a quick screen any GP can do. If you have joint hypermobility plus chronic pain, frequent sprains, dizziness on standing, gut issues, fatigue, brain fog, or stretchy/soft skin, full hypermobility assessment is reasonable. Many autistic adults discover hypermobility only after autism diagnosis prompts looking at the broader pattern.
Does sensory processing in autism relate to hypermobility?
Possibly, through proprioception overlap. Proprioception is the sense of body position in space. Hypermobile adults often have reduced proprioception (loose joints provide less proprioceptive feedback). Autistic adults often have sensory processing differences including proprioception. The overlap may explain why some autistic adults seek deep pressure (compression, weighted blankets) — both for autistic sensory regulation and hypermobile proprioceptive needs.
What helps if I have both autism and hypermobility?
Multi-modal approach: physiotherapy adapted for hypermobile bodies (strength training to support loose joints), pacing (don’t push through fatigue), pain management as needed, autonomic support if POTS is present (hydration, salt, compression), sensory accommodations for the autism, treating co-occurring conditions (ADHD, anxiety, depression often present in this cluster), and working with healthcare providers who understand both conditions. The Neurodiverge Pro tracker can help with daily pacing and pattern recognition.
Why is this overlap so often missed?
Healthcare specialisation creates silos. Rheumatology doesn’t routinely screen for autism. Autism services don’t routinely screen for hypermobility. GPs often miss both. The result: adults with both conditions can spend decades getting partial care for each in isolation, with the bigger picture never being assembled. Recognising the overlap can unlock more integrated care. ND-aware clinicians familiar with hypermobility are scarce but growing.