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From SNPedia

Hemophilia is a type of hereditary bleeding disorder. Different types of hemophilia are caused by mutations in the genes for blood clotting factors, leading to a clotting disorder. The X-linked bleeding disorders primarily affect males, although in extremely rare cases they can appear in females. The severity of each type is variable, and treatments are available. PubMed Health Wikipedia

Von Willebrand disease is the most common hereditary bleeding disorder. It is generally much less severe than the hemophilias.

The word hemophilia (also spelled haemophilia) comes from the Greek haima, meaning "blood," and philia, meaning "to love."