Thanks for your patience while I got my site updated in time for Ehlers-Danlos syndromes Awareness Month in May 2017. And please refer to this site via the international Ehlers-Danlos Society for the ultimate answers. I urge downloading the 18 classification papers while they are available for FREE here now. They may go back behind a paywall at some point, so I would snag a copy just in case!
Some may still wish to refer more distinct or unusual cases to the geneticist. But the new nosology and this toolkit were designed specifically to ease the burden on medical genetics offices. (Personal note: I was honored to be tapped by the project lead as a contributing author based on my blog and Twitter stream.) (Last updated 2/21/22)
13 Types of EDS Newly Defined in 2017
Original post updated May 2017
Boy is this a hot topic! Naturally, since it’s often so hard to even get a doctor or doctors to listen to us and recognize our vast collections of symptoms as a possible systemic condition, we naturally want an easy test to take and be done with this painful journey. Our often ADHD brains and over busy doctors want this too, natch.
And there is no single test panel yet to identify which type of rare EDS you might have if you do suspect one of those as Dr. Murray explains in this webinar from October 2015. Also, we now refer to the collection in the plural, as noted here.
I.e, you can’t just take one single genetic test to figure out which type you have, you have to suspect a type clinically first after ruling out other possibilities, then order the matching test for that type if one exists and is warranted.
Even then, the tests are not all 100% accurate, so some are just done for research purposes. So you may still be diagnosed only clinically even with a rare form after all other possibilities are ruled out. (I did warn you there were no easy answers!)
Update May 2019: Yes, whole genome and whole exome sequencing are coming way down in price and becoming a possibility for more patients at nearly $1000 now. But, this may not be a practical move. You end up with seriously overwhelming heaps of unnecessary data to weed and sort through, and the bench research to match it with is still not there.
I.e, you may have many interesting Variants of Unspecified Significance, or VUS’s, but no one may know what to do with them yet. Science needs to really catch up. Same goes for WES testing still too, though it is just a subset of your genome too. /End update
There were six main types of EDS recognized until March 14th, 2017, but myriad one-off mutations in single families around the world with new ones found periodically. There are now 13 total types recognized as of March 2017, up from the former six main types prior. Five of those six former types were considered rare, but now all thirteen are considered rare again based on the new criteria, and twelve of the thirteen now have known genetic markers.
But the most common type by far still, hypermobile EDS or hEDS as it’s called now (no numbers any more please!) does not yet, so can only be diagnosed clinically yet using the new 2017 diagnostic criteria for it.
Nota Bene March 2017: The criteria for hEDS were tightened a good bit, and an entirely new category of Hypermobility Spectrum Disorders or “HSD”was proposed and adopted to catch the rest of us who show some hypermobility, but no longer meet these new criteria. (You may be very bendy, but not have enough issues with your tissues to pass, or have lots of systemic trouble, but not be flexible enough to pass the hEDS criteria.)
So I will now refer to all forms of EDS as rare again, but I personally do not consider the HSDs to be, just rarely recognized still and no, not just because they’re new. Because patients’ complaints keep being dismissed as mine were for 44 years due to misinformation and misunderstanding about how common the condition is.
I.e, you may have your very own collagen defect and syndrome, who knows. Or it may turn out to be something else entirely that just mimics a collagen defect. This wouldn’t be the first time. Just ask folks with Marfan or Stickler Syndromes.
Not all SNPs cause disease or trouble just because they are on a gene of interest (e.g. ADAMST2, PLOD1 etc.), some are just variations from the wild type, period, like hair color. You wouldn’t say brown haired people have a hair disease for instance, right?
Further, few doctors will take such a diagnosis seriously, nor should they. One geneticist I know has found errors in his patient’s 23andMe data after running WES on them later. And the second-party data interpreters (e.g. LiveWello, Genetic Genie, etc.) are not known for high accuracy for another thing.
LiveWello is currently allowing patients to choose their own unproven sets of SNPs and combine them into “reports” you can then run against your raw 23andMe data. According to one of these, I technically have four different rare forms of EDS – I don’t think so! Yes, you can use it to suspect something, but only to suspect and start a conversation with your doctors. NOT to diagnose!
I’ve also gotten conflicting results from my own raw data after downloading and parsing it through the same parser at different times. One time said I had a particular defect, the other time said I didn’t. From the same identical unaltered zip file. Which one is correct? I may never know. But I don’t think I should medicate or diagnose based on such questionable info! To quote Dr. Ben Lynch, “treat the person, not the SNP“, always.
Please do consult a qualified doctor, preferably a geneticist if able to get the most accurate and complete diagnosis (remember Hickam’s Dictum), while ruling out other similar Heritable Connective Tissue Diseases (HCTDs) and other similar or secondary conditions while we continue tracking down more mutations for hypermobile EDS. You might look for a local support group to help find the knowledgeable doctors in your region.
Hypermobility, often mis-interpreted to mean flexibility by most people itself is just a trait, like red hair color, and in itself is generally benign. It is thought to run in about 10% or more of the general population and lends nicely to gymnastic and ballet careers.
The EDS and now also the HSDs all involve hypermobility plus symptoms, or issues like fallen arches, bad teeth, tendinitis, hernias, easy bruising, varicose veins and so much more that ultimately drive you to see the doctor a lot for those who aren’t in denial.
This is the reason the now obsoleteBRIGHTON (as in Brighton, England with an “r”) Diagnostic Criteria were developed almost 20 years ago – the leading specialists realized they were missing a lot of older and less bendy patients who are either no longer flexible, or never were, but who all have common extra-articular (meaning non-joint-related) issues and signs of a collagen defect. (Stretch marks, odd scarring, thin or stretchy skin, myopia, varicose veins, tendinitis, hernias, prolapses, etc.)
But they may not have obvious or predominant signs or family history of one of the more rare types of EDS leading to suspecting those.
New Diagnostic Criteria
Update March 20, 2017: Alas, the Brighton Diagnostic criteria are now gone, and supplanted by these now. On a good note, we will no longer have to deal with the confusion between the Beighton (with an “e”) 9 pt hypermobility scale or score, and the Brighton (with an “r”) diagnostic criteria (which included the Beighton scale), which no one ever kept straight!
The two most common types of EDS, hEDS and cEDS, appear to have an autosomal dominant inheritance pattern, meaning that if just one parent carries the defective gene, you have a 50% chance of passing it on to a child. Vascular EDS is also autosomal dominant in families, but more rare due to its lethal nature. Although this has not been verified nor confirmed for hEDS yet. Further study is warranted and eagerly sought!
But other forms are autosomal recessive, so are even more rare, thankfully. Both parents would have to carry the same recessive gene for a child to express the defect also which by Punnet Square math happens only 1 in 4 times (or a 25% chance) even then.
And again, this does not preclude an occasional rare “de novo” (new) mutation that might spring up in a family once in a while. Though I’ve yet to meet one who truly did not show a family history once we delved deeply enough and I enlightened them further to the MANY manifestations of EDS, but the possibility does exist, however rare.
Diagnosing Hypermobile type EDS (hEDS) and Hypermobility Spectrum Disorders
Once you’ve ruled out all the more distinct rare forms of EDS and other HCTDs as described above, you are then left to diagnose the most common type of EDS by far known as hypermobile EDS or hEDS, clinically only via a thorough physical exam using these new criteria.
And if the patient is not bendy enough, or doesn’t pass those, then one of the forms of Hypermobility Spectrum Disorders should be considered now as previously mentioned.
I like to think of the forms of EDS as the tip of the iceberg, easily visible above the water line and thus more easily diagnosed, and the new Hypermobility Spectrum Disorders are the vast majority that are less visible to the medical eye below the water line that we have just now recognized is there.
I for one think this is okay – at least we have something to hang this painful condition on, and if all of us patients will start to take it seriously, hopefully we’ll get our doctors to do so too. Because right now, I technically would not pass the hEDS criteria, as I’m too stiff, despite being uber bendy as a child. So I would match the new “H-HSD” category, or Historic Hypermobility Spectrum Disorder best, I think.
hEDS has often been under and misdiagnosed as Fibromyalgia, Hypermobility Syndrome, Joint Hypermobility Syndrome, and (my fav) Benign Joint Hypermobility Syndrome in the past.
All of these diagnoses and names are also going away, and one should be diagnosed with either a form of EDS, or a form of Hypermobility Spectrum Disorder now based on the above. Hopefully more rheumatologists will be made aware of this new diagnosis, to help ease the burden on the overloaded geneticists currently. Try out the EDS Toolkit here!
That said, a geneticist’s diagnosis will carry more “weight” with other doctors, and some specialists require this before they will treat for things like Chiari Malformation (which is surprisingly common among us), though technicallyany doctorcan diagnose anEDS or an HSD that is willing based on the above. It’s just that few are willing to stick their necks out yet, and… the information above is brand new to everyone since March 2017.
Here is a sample spreadsheet for helping to gather some of your relevantfamily history in a fixed, unmodifiable samplePDF Here. This is just an example I developed, you can create your own using a spreadsheet program like Excel as well. (October 2018 editor’s note: I used to have another pre-diagnostic medical workup page linked from The Coalition Against Pediatric Pain here too, but it seems to have been deleted, sorry!)
Diagnosing Vascular EDS (vEDS)
Ehlers-Danlos of all types runs across all races/ethnicities. But thanks to more visible blue veins showing under their more “see-through” skin, almost everyone with light or pale skin wonders at some point if they don’t have vascular EDS (vEDS, formerly Type IV), a dangerous rare form that lends to more shortened life spans than most from arterial or inner organ rupture.
“1. Possible diagnosis of EDS type IV: The vast majority of probands in families with this form of EDS are identified on the basis of a major complication either bowel perforation or vascular aneurysm or rupture. The International Ehlers-Danlos Foundation Advisory Board set the following guidelines for determination of the clinical diagnosis of EDS type IV. DNA-based testing is recommended for those who meet these guidelines. Note, however, that individuals with nonsense mutations of COL3A1 are less likely to have similar physical characteristics. The clinical diagnosis of EDS type IV is highly suspected when two major diagnostic criteria are present:
Major clinical diagnostic criteria:
Uterine rupture during pregnancy
Family history of the vascular type of EDS
Minor diagnostic criteria alone are not sufficient to warrant the diagnosis unless identified in an individual with a major criteria.
Thin, translucent skin (especially noticeable on the chest/abdomen)
Easy bruising (spontaneous or with minimal trauma)
Characteristic facial appearance (thin lips and philtrum, small chin, thin nose, large eyes)
Acrogeria (an aged appearance to the extremities, particularly the hands)
Hypermobility of small joints
Early-onset varicose veins
Arteriovenous carotid-cavernous sinus fistula
Chronic joint subluxations/dislocations
Congenital dislocation of the hips
Talipes equinovarus (clubfoot)
“Proband” is genetic speak for “person presenting now” (I.e, the patient), vs their parents or children. I actually had vascular and kyphoscoliotic types ruled out based on a history of an ascending aortic aneurysm (or AAA) in my dad, skin and facial features, severe scoliosis in my aunt from birth, keratoconus, visible veins, and small joint involvement among other things. I was relieved to learn I was negative for both, and we settled on the as yet not fully defined hEDS for my diagnosis in 2012.
But that doesn’t mean I don’t still watch for issues, and I did have a baseline echocardiogram done to rule out any aortic root dilation (common in us), or mitral valve issues.
To be sure, there’s nothing very benign about hEDS aside from not dying directly. People with hEDS and the HSDs still end up mitigating plenty of serious issues, including severe dysautonomia, weak necks and spines lending to CNS issues, sciatica, spondylolysthesis (slipped vertebrae), Chiari malformation and more. (Including anaphylaxis from commonly comorbid MCAD issues.)
Further, although EDS types generally run “true” within a family, meaning if your parent has vEDS, you will get vEDS (if you do), it is possible to have more than one type of EDS coexisting in one person, even if it’s rare. I know one patient with both a rare form of EDS AND Marfan Syndrome, both confirmed with genetic testing. Talk about winning the genetic lottery! But generally EDS will run true to type, meaning, if your contributing parent has classical EDS, you will inherit that form, and not kyphoscoliotic EDS, unless careful medical history or testing reveals another form from the other side of your family or you have a rare de novo mutation in your family.
And for what it’s worth, I’m finding most who have gotten diagnosed the most easily (i.e, are the most symptomatic/afflicted) in my large support groups online recently notice signs on BOTH sides of their families in 20/20 hindsight including myself. (Update 2018: I’ve since met a cousin on my late mother’s side who is diagnosed with hEDS also so this is now confirmed for me.) Leaving me to think a large percentage with single alleles of some form of hypermobile EDS or the new Hypermobility Spectrum Disorders may constitute what I call the “Walking Wounded” (less clinically visible as I was for 44 years), or folks who got diagnosed with “just” HMS, JHS, or BJHS or more often the catch all bin: Fibromyalgia, a common under and mis-diagnosis for us.
No, these conditions are no cake-walk, though yes, as I’m slowly but steadily proving along with many other hardy survivors that you can recover to some extent through dedicated nutritional & dietary work and tailored “zebra-friendly” (core-building) physical therapy that avoids injuring us further, and strengthening the bits we can. I am now walking a bit again thanks to five years of slow, steady hard work in a warm water therapy pool and on my bike, along with a disciplined custom low-inflammatory diet and supplementation.
Lastly, I’ll note that having EDS itself, as comprehensive as it is, does NOT preclude having other diseases, conditions or issues (aka comorbidities), simultaneously. As Hickam’s Dictum states: “patients can have as many diseases as they damn well please!” And I mean beyond the incredible list of ones I’ve already noted are fairly common in the community (thyroid issues, autism, depression, CVID, allergies, insomnia, chronic fatigue, fibromyalgia, etc.) You may have any number of other illnesses and genetic disorders in addition, also.
As someone else unknown to me brilliantly said, EDS is as individual as fingerprints, and we are all unique individuals in addition especially when you toss in environmental factors which influence our epi-genetics, a whole other layer affecting genetic expression. So while we may share some common “themes” of dysautonomia, fatigue, pain and hypermobility, it will truly express absolutely uniquely within individuals even within the same family. This is known as variable expression. To borrow another phrase from the Autistic community: if you’ve seen one Ehlers-Danlos (or HSD) patient, you’ve seen one Ehlers-Danlos (or HSD) patient!
But as you know I feel strongly, every doctor has seen HSD if not also EDS patients whether they know it or not. Heck, we’re the frequent flyers in their offices by default! In fact, everyone has seen an HSD or EDS patient whether they know it or not, we’re that common IMHO. Hopefully the doctors will start spotting us a bit sooner with this information I’m sharing. (Nurses too!) I hope the above has helped to clarify how best to pursue a diagnosis once you do suspect it.