1. Age. Such as newborns with vitamin K deficiency, or older adults with hemophilia A.
2. Genetic Factors.
3. Male gender.
4. Have another medical condition, such as cancer, autoimmune disease, or liver disease.
5. Blood transfusion.
6. Obesity
7. Taking medications, such as antibiotics, blood thinners, or alpha interferon.
8. Pregnancy and childbirth.