What's the plural form of Ehlers-Danlos syndrome? Here's the word you're looking for.
Answer
The noun Ehlers-Danlos syndrome can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be Ehlers-Danlos syndrome.
However, in more specific contexts, the plural form can also be Ehlers-Danlos syndromes e.g. in reference to various types of Ehlers-Danlos syndromes
or a collection of Ehlers-Danlos syndromes.