The Ehlers-Danlos Syndrome (EDS) is a collagen disease characterized by joint hypermobility, skin hyper-extensibility and generalized tissue fragility. It is usually inherited in an autosomal dominant manner and they differ from each other in gene mutation involved in the structure of different types of collagen. We report two female patients with a diagnosis of EDS Type III and Type IV with different clinical manifestations, evolution and prognosis. The first case, EDS Type III, presented marked joint hypermobility and skin hyper-extensibility, and the second case, EDS Type IV, arterial rupture leading to extensive bruising, obstetrics complications and skin hyper-extensibility.