The most common group of disorders in the family of genetically determined heritable disorders of connective tissues, characterised by joint hypermobility, skin hyperextensibility, and tissue fragility. Hypermobile Ehlers-Danlos syndrome (EDS) is the most common of 13 subtypes.
Many affected people do not develop symptoms, or they develop only minor symptoms during their lifetime. Most hypermobile people are not aware of the fact and assume that everyone is as flexible as they are.
Apart from joint hypermobility, skin manifestations provide an important clue and include soft, silky skin texture, semi-transparent dermis, and hyperelasticity. Patients commonly demonstrate easy bruising, scarring, and poor wound healing.
In addition to musculoskeletal and skin manifestations, cardiovascular and gastrointestinal features, autonomic dysfunction, and features of chronic pain syndrome and marfanoid habitus are often present.
Definitive diagnosis for all subtypes of EDS, except hypermobile EDS, can be made by molecular genetic testing. The genetic basis of hypermobile EDS remains unknown and the diagnosis is made by clinical criteria only.
Recommendations are primarily based on expert opinion. Therapy is tailored to individual needs. Multidisciplinary input may be necessary.
Many patients live healthy, unaffected lives and may never come to clinical attention, particularly those with hypermobile EDS. Vascular EDS is associated with a shortened lifespan due to susceptibility to arterial or visceral rupture.
Ehlers-Danlos syndrome (EDS) is the most common group of disorders in the family of genetically determined heritable disorders of connective tissues. Caused by pathogenic variants affecting genes encoding for or modifying collagen, fibrillin, and/or other matrix proteins (e.g., tenascin), these disorders have similar phenotypes with varying degrees of expression that may include joint hypermobility, skin hyperelasticity, easy bruising, atrophic scars, and marfanoid habitus. There are numerous subtypes of EDS, of which hypermobile EDS (hEDS) is the most common.  Previously it was considered synonymous with benign joint hypermobility syndrome, sharing debilitating, yet often overlooked, associations with autonomic dysfunction, chronic pain, anxiety/phobic states, gastrointestinal dysmotility, and chronic fatigue (much in the same way as with cases of fibromyalgia).  However, newer classifications have now described a spectrum for patients that ranges from joint hypermobility to hypermobility spectrum disorders to hEDS.  Classical EDS is the second most common subtype of EDS and is characterised by skin hyperextensibility, atrophic scarring, and impaired wound healing. The most catastrophic is vascular EDS, which is associated with blood vessel rupture and visceral perforation, and may have life-threatening consequences.
Director, Adult Genetics
Department of Molecular & Human Genetics
Baylor College of Medicine
Chief, Section of Genetic Medicine
Michael E. Debakey Veterans Affairs Medical Center
SD declares that she has no competing interests.
Dr Shweta Dhar would like to gratefully acknowledge Dr Rodney Grahame and Dr Alan Hakim, the previous contributors to this monograph. RG and AH are authors of several references cited in this monograph.
Division of General Internal Medicine
Department of Medicine
McKusick-Nathans Institute of Genetic Medicine
Johns Hopkins University
HPL is an author of a number of references cited in this monograph.
Fund for Scientific Research
Flanders Centre for Medical Genetics
Ghent University Hospital
BC declares that he has no competing interests.
Professor of Pharmacological Rheumatology
University of Leeds
Chapel Allerton Hospital
HB declares that he has no competing interests.
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