
Warning: science stuff
Hemophilia is an inherited condition in which a person's blood isn’t able to clot normally1. People with hemophilia lack one of the proteins, called coagulation factors, that work together to form a clot whenever bleeding occurs. The coordinated effect of all of these proteins working together is called coagulation2.
One event triggers the next event which triggers the next and so on, in a chain reaction that stops the bleeding when we injure ourselves. It’s like dominos. The game, not the pizza.


1 World Federation of Hemophilia. Guidelines for the Management of Hemophilia. 2nd ed. 2012. http://www1.wfh.org/publications/files/pdf-1472.pdf. Accessed June 14, 2016.
2 World Federation of Hemophilia. Hemophilia in pictures. http://www.wfh.org/en/page.aspx?pid=1297. Accessed June 14, 2016.
3 National Hemophilia Foundation. Hemophilia A. http://www.hemophilia.org/Bleeding-Disorders/Types-of-Bleeding-Disorders/Hemophilia-A. Accessed June 14, 2016.
2 World Federation of Hemophilia. Hemophilia in pictures. http://www.wfh.org/en/page.aspx?pid=1297. Accessed June 14, 2016.
3 National Hemophilia Foundation. Hemophilia A. http://www.hemophilia.org/Bleeding-Disorders/Types-of-Bleeding-Disorders/Hemophilia-A. Accessed June 14, 2016.