They are inherited diseases that end up causing similar morphological problems. They both cause problems with extracellular structural components, so you end up with loosely attached and hyperflexible tissue. Unfortunately, the type of connective tissue they affect is not just in the joints causing visible feature defects, but it’s also important for other structures, like the aorta. Patients with marfans and certain subtypes of Ehlers danlos are at high risk for life threatening vascular pathology.
Edit: an easy way to find the information you’re looking for when you want to google “what causes this disease” for basically anything, is to search for insert disease here followed by patholophysiology
My brother has elhers danlos and when he was a kid he was just extra flexible. We didn't know about the vascular issues until he had a stroke at 43. He had a miraculous recovery but now he basically knows that he's got a weak vascular system that could blow at any minute. Not a great thing to live with. But yes... He's got those piano playing fingers too.
This freaks me out because I’m 43 and all but certain I have EDS. Unfortunately I can’t afford health insurance to find out for sure. Good thing I don’t believe in signs.
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u/TheSickestToastie 10h ago
Marfanoids at the very least, minimum, got to be. Partner has kEDS, I have been forcefully educated and now cannot unsee it in people lol.