Ehlers-Danlos Syndrome

Overview

Hypermobile Ehlers-Danlos syndrome (hEDS) is the most common of the Ehlers-Danlos conditions and, right now, it's a clinical diagnosis, because no confirmed causative gene has been pinned down yet. It's an inherited connective tissue disorder marked by generalized joint hypermobility, ongoing joint instability and pain, and a whole collection of systemic symptoms.

Impact

People with hEDS often spend years being misdiagnosed, with an average diagnostic odyssey of around a decade, and they frequently live with coexisting conditions like chronic pain, dysautonomia/POTS, GI dysmotility, anxiety, and migraines that can really disrupt work, school, and independence. Families often end up managing appointments across a long list of specialists, and because so much of the condition is invisible from the outside, it often gets missed or dismissed in emergency rooms and primary care.

Medical Overview

Unlike other EDS subtypes like classical or vascular EDS, hEDS doesn't have a validated molecular cause yet, though research increasingly points to polygenic factors and extracellular matrix pathways. The 2017 international criteria require three things: generalized joint hypermobility (assessed with the Beighton score), a combination of systemic connective tissue features, either a positive family history or musculoskeletal complications, and exclusion of other inherited or acquired connective tissue disorders through genetic testing when appropriate. Common coexisting conditions include POTS, mast cell activation syndrome, functional GI disorders, pelvic floor dysfunction, and mitral valve prolapse. Management is multidisciplinary and symptom-based, with physical and occupational therapy for joint stabilization, graded exercise, pain management, bracing and orthotics, and support for autonomic, GI, and mental health issues. Genetic testing matters because it rules out vascular, classical, or kyphoscoliotic EDS and other heritable disorders, which have different prognoses and different surveillance needs.

References

1. Halverson CME, et al.. Comorbidity, misdiagnoses, and the diagnostic odyssey in patients with hypermobile Ehlers-Danlos syndrome . Genetics in Medicine Open . 2023.
2. Ritelli M, et al.. Looking back and beyond the 2017 diagnostic criteria for hypermobile Ehlers-Danlos syndrome: A retrospective cross-sectional study from an Italian reference center . American Journal of Medical Genetics Part A . 2024.