When ligaments are lax, the structures they are supposed to stabilize can move more than they should. In a knee or shoulder, that can mean recurring strains or a joint that gives way. In the upper neck, it can contribute to cervical instability (CCI), where the ligaments holding the top of the spine do not provide steady support. Because the upper neck is a busy, sensitive area, instability there can produce a wide range of symptoms.
This is the intersection where our work sometimes meets hypermobility. We do not treat hEDS as a whole-body condition. What we can evaluate is whether ligament laxity is contributing to a specific, treatable musculoskeletal problem, such as neck instability or a persistently unstable joint.