Genetics cause EDS. The two known inheritance patterns for the Ehlers-Danlos syndromes include autosomal dominant and autosomal recessive. The connective tissue a person with EDS is built with is not structured the way it should be. With a badly-constructed or processed connective tissue, some or all of the tissue in the EDS-affected body can be pulled beyond normal limits which causes damage. Connective tissue can be found almost anywhere, in skin, muscles, tendons and ligaments, blood vessels, organs, gums, eyes, and so on.