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Von Willebrand disease (vWD) is the most common genetic coagulation disorder described in humans. It affects up to 1% of the population, although most cases are mild. Symptomatic vWD is much rare, ~1 in 10000. Von Willebrand disease arises from a qualitative or quantitative deficiency of von Willebrand factor (vWF), a large glycoprotein protein that is required for platelets to bind to collagen. vWF is therefore important in primary hemostasis. When the disease comes to medical attention, it usually presents in the typical manner for platelet disorders: mucosal bleeding and easy bruising. The disease is usually inherited in an autosomal dominant manner, although there are recessive forms as well, and it can also be acquired secondary to another disease.