Ehlers-Danlos research, sorted by kind of evidence.

Where kinds of evidence agree

Records where independent studies or reports from more than one kind of evidence point the same way. Local anesthetics are the clearest case: patients reported that they failed, surveys measured how often, and a randomized trial published in 2026 found that fewer people with EDS were still numb 15 and 30 minutes after a lidocaine injection.

• Local anesthetic resistance in EDS: patient reports, two surveys, and a 2026 trial

  practiceevidence: establishedindependent evidence agreescaution

  People with EDS often report that local anesthetics fail or wear off early. In a survey reported in 2005, 58% of 172 women with joint hypermobility syndrome said a local anesthetic had not been as effective as it should have been, against 21% of 53 age-matched controls without hypermobility. In a 2019 online survey, 88% of 980 people with EDS who had a dental local anesthetic recalled inadequate pain prevention, against 33% of 249 people without EDS. A randomized cross-over trial published in 2026 (135 participants, 91 with EDS) found that fewer participants with EDS still had numbness 15 and 30 minutes after a lidocaine injection, which the authors read as a shorter-lasting effect.

  all EDS types · 2026-03 · Management and clinical care

• Diagnosis navigation and specialist-finding strategies

  patient-reported patternevidence: community signalindependent evidence agrees

  Members share advice on which specialists diagnose EDS, which tests matter, and how to prepare for an appointment, in response to diagnostic delays that often last years. This is peer advice, not a clinical pathway.

  hEDS, HSD · Community knowledge

• The “trifecta”: hEDS, POTS, and mast cell activation reported together

  patient-reported patternevidence: community signalindependent evidence agrees

  Patient communities often describe hEDS, POTS (a form of dysautonomia), and mast cell activation syndrome (MCAS) occurring together, and call the combination the “trifecta”. In a Global Registry survey of 505 people with hEDS, POTS and MCAS were among the diagnoses participants most often endorsed as accurate. Whether the three share a mechanism is unknown.

  hEDS, HSD · Comorbidities and systemic features

• In a registry survey, people with hEDS reported about ten other diagnoses

  findingevidence: probableindependent evidence agrees

  A Global Registry survey of 505 people with clinically confirmed hEDS, published in 2023, found an average of 10.45 other diagnoses. Anxiety, depression, and migraine were the most common. Participants most often rejected functional neurological disorder, multiple sclerosis, and fibromyalgia as wrong, and most often endorsed POTS, cervical instability, and MCAS as accurate.

  hEDS · 2023 · Comorbidities and systemic features

• hEDS diagnosis remains clinical despite the KLK15 finding

  findingevidence: establishedindependent evidence agrees

  The Ehlers-Danlos Society says kallikrein (KLK) genes are not on EDS genetic testing panels and that hEDS remains a clinical diagnosis, and that further studies, including the HEDGE study, are needed to replicate the KLK15 finding. The KLK15 authors say their study does not propose a diagnostic framework and that the absence of KLK15 variants should not rule out a clinical diagnosis.

  hEDS · 2025-08 · Diagnosis and classification

• Diagnosing EDS and HSD often takes years

  findingevidence: establishedindependent evidence agrees

  A 2021 review of 13 qualitative studies of adults with hEDS or HSD found diagnosis delayed by the symptoms themselves and the lack of a confirmatory test, by patients seeing many providers and receiving many diagnoses, by limited clinician knowledge, and by fragmented health systems. Surveys put numbers on the delay. At one German EDS clinic, the median time to diagnosis was 23.0 years for hEDS or HSD and 14.5 years for classical and classical-like EDS. In an Australian survey of 152 women with EDS, more than half had first noticed symptoms more than 15 years before diagnosis.

  all EDS types · 2021 · Patient experience and diagnostic odyssey

How to read a record

Every record carries the same labels. Here is one, numbered.

Five kinds of evidence

Each source belongs to one of five kinds of evidence and is graded on that kind's own scale, so a pattern reported in patient forums is never scored against a randomized trial.

• clinical

  Peer-reviewed literature, trials, guidelines, and consensus statements.

  Cited in 29 records

• community

  Patterns reported across forums, support groups, and patient organizations. The index names the venue, never the person.

  Cited in 14 records

• historical

  Case reports from before EDS was formally classified, accounts of 19th-century performers, and folk treatments.

  Cited in 13 records

• registry

  Patient registries, trial registrations, and rare-disease reference databases such as Orphanet and GARD.

  Cited in 13 records

• gray literature

  Preprints, theses, and working papers that have not been peer reviewed.

  Cited in 2 records

Browse the index

• Subtypes

  The thirteen types in the 2017 classification, plus HSD: genes, inheritance, prevalence, and what sets each apart.

• Timeline

  From van Meek'ren's 1682 report through Berlin, Villefranche, and the 2017 International Classification to the search for an hEDS gene.

• Practices

  Treatments and management approaches, from clinical guidance to patient-reported and folk practice, with the evidence level and any known risk.

• Community knowledge

  Patterns reported in forums and support groups, filed as patient reports. Venues are named; individuals are not.

• Source catalog

  Every cited source with its kind of evidence, evidence level, publisher, and permanent ID.

• Research program

  Open questions, the searches the index uses to find new evidence, and a log of every change to the data.

• Methodology

  How sources are sorted and graded, how settled each claim is, and when records are reviewed.

• Data

  Every record and source as plain YAML files you can download and check.

Categories

• Disease historiography

  How the EDS concept formed: first descriptions, performer-era records, nosology revisions, and the modern classification era.

• Diagnosis and classification

  How EDS is diagnosed: the Beighton score, the three-part 2017 hEDS criteria, genetic confirmation of the other types, and why older studies used different criteria.

• Genetics

  Confirmed genes for twelve EDS types and the search for genes behind hEDS, the one type without a known cause.

• Comorbidities and systemic features

  Conditions that often come with EDS: dysautonomia and POTS, mast cell activation, digestive problems, pain, and fatigue.

• Management and clinical care

  Physical therapy, pain management, and cautions about anesthesia and surgery, with the strength of the evidence behind each.

• Community knowledge

  Patterns that recur in patient forums and organizations: practical advice, self-management, and problems patients report before research has studied them.

• Folk practices and early management

  How people managed loose joints before modern evidence existed. These records describe history; they are not recommendations.

• Patient experience and diagnostic odyssey

  How long diagnosis takes, how patients are treated on the way, and the studies that describe both.

• Research programs, registries, and trials

  Registries, trial listings, and programs that support EDS research, including the DICE Global Registry, EDS ECHO, ClinicalTrials.gov, Orphanet, and GARD.