A bleeding disorder is a condition that prevents the blood from clotting properly. There are several types of bleeding disorders, including hemophilia, von Willebrand disease, and other, very rare factor deficiencies. These disorders can range from mild to severe, and most are inherited at birth. Normally, there are several proteins or factors present in the body that work together during the blood-clotting process. In individuals with bleeding disorders, one or more of these factors are damaged or missing. This can lead to slow clotting after accident or injury, and increased blood loss. Bleeding disorders are most commonly treated by replacing the missing or damaged factor in the blood, also known as factor replacement therapy. People with bleeding disorders work with their doctors to determine the best course of therapy.