What is haemophilia?
Haemophilia is an inherited bleeding disorder where the blood doesn't clot properly. It is caused when blood does not have enough clotting factor. A clotting factor factor is a protein in blood that controls bleeding.
- Haemophilia A (also called classical haemophilia) is the most common form, and is caused by having low levels of factor VIII (8)
- Haemophilia B (sometimes called Christmas Disease) is caused by having low levels of factor IX (9).
In Australia there are more than 3,000 people diagnosed with haemophilia, who are mostly male. Severe haemophilia in females is very rare, but some females have lower factor levels and bleeding symptoms. Both males and females with less than 40% of the normal level of clotting factor are now recognised as having haemophilia.
Bleeding is most commonly internal. The low levels of clotting factor produce a wide range of bleeding episodes, usually into the joints or muscles. These bleeding episodes, or 'bleeds', may occur spontaneously, without an obvious cause, or as a result of trauma or injury. Specialised treatment is needed to help blood clot normally and is often infused or injected into a vein. If internal bleeding is not stopped quickly with treatment, it will result in pain and swelling. Over a period of time bleeding into joints and muscles can cause permanent damage such as arthritis, chronic pain and joint damage requiring surgery.
Date last reviewed: 27 August 2021
Important Note: This information was developed by Haemophilia Foundation Australia for education and information purposes only and does not replace advice from a treating health professional. Always see your health care provider for assessment and advice about your individual health before taking action or relying on published information.
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