Hemophilia is a rare genetic disorder that doesn't allow your blood to clot properly, making it hard for you to stop bleeding. Most often this is due to a DNA flaw which causes substances called clotting factors to operate abnormally. Clotting replacement therapy is the typical treatment for hemophilia. If left untreated, a simple cut can lead to major blood loss and complications from bleeding. Learn more about genetic testing, diagnosis and managing hemophilia with expert advice from Sharecare.