Although very basic, hypermobile Ehlers-Danlos syndrome (hEDS) can be defined a an inherited connective tissue disorder that is caused by defects in a protein called collagen. It is generally considered the least severe form of Ehlers-Danlos syndrome (EDS) although significant complications can occur. Common symptoms include joint hypermobility, affecting both large (elbows, knees) and small (fingers, toes) joints; soft, smooth skin that may be slightly elastic (stretchy) and bruises easily; and chronic musculoskeletal (muscles and bones) pain. Although hypermobile EDS is thought to be a genetic condition, the exact underlying cause is unknown in most cases. A small percentage of people with this condition have a change (mutation) in the TNXB gene. Most cases of hypermobile EDS, are inherited in an autosomal dominant manner. Treatment and management is focused on preventing serious complications and relieving associated signs and symptoms. – 2016 Gene Reviews
Personally, I describe how I feel as having a layer of skin that is holding my skeleton in place with no muscles or tendons to support my insides. I know pain is hard to imagine, but trust me when I say it is very painful.