Hemophilia

Hemophilia is a genetically acquired trait, more common in males than females. Hemophilia is an x-linked/sex-linked trait. Hemophilia is a disease that can cause your blood to not have the clotting qualities of non-hemophiliacs. This makes everyday bumps, cuts, and scratches potentially life threatening. Hemophilia will cause a small cut that a normal person probably wont worry about, and will probably only bleed for a few minutes to become life threatening and could possibly cause the person to lose a lot of blood and possibly bleed out. Also if a normal person were to get hit in the stomach, they would probably be fine, but a person with hemophilia would most likely get internal bleeding and that causes a lot of problems.

http://hemophilia.aboutkidshealth.ca/en/Assets/Hemophilia_severity_MED_ILL_EN_72.jpg