Hemophilia

What is Hemophilia?

What is hemophilia? Hemophilia is a rare bleeding disorder in which the blood does not clot properly. This can lead to problems with bleeding too much after an injury or surgery. You can also have sudden bleeding inside your body, such as in your joints, muscles, and organs. Your blood contains many proteins called clotting factors that can help form clots to stop bleeding. People with hemophilia have low levels of one of these factors, usually either factor VIII (8) or factor IX (9). How severe the hemophilia is depends on the amount of factor in the blood. The lower the amount of the factor, the more likely it is that bleeding could happen and might lead to serious health problems. What are the types of hemophilia? There are several different types of hemophilia. The most common are: Hemophilia A (classic hemophilia), which is caused by a lack or decrease of clotting factor VIII (8) Hemophilia B (Christmas disease), which is caused by a lack or decrease of clotting factor IX (9) What causes hemophilia? Most types of hemophilia are inherited. They are caused by change in one of the genes (also called a mutation) that provides instructions for making the clotting factor proteins. The change may mean that the clotting proteins don't work properly or that they are missing altogether. These genes are on the X chromosome. You may have one or two X chromosomes: People who are born male have one X chromosome (from the mother) and one Y chromosome (from the father). They can get hemophilia if their one X chromosome has the gene change. People who are born female have two X chromosomes, one from the father and one from the mother. They usually only get hemophilia if: Both X chromosomes have the gene change OR One X chromosome has the gene change and the other X chromosome is missing or inactive. People who are born female who have the gene change on one X chromosome are a "carrier" of hemophilia. Sometimes they may have some symptoms of hemophilia. They can pass the gene change on to their children. Hemophilia that is not inherited is called acquired hemophilia. It is rare. It happens when your body makes specialized proteins called autoantibodies that attack and disable a clotting factor. This can happen because of pregnancy, immune system disorders, cancer, or allergic reactions to certain medicines. Sometimes the cause is unknown. Who is at risk for hemophilia? Hemophilia is much more common in people who were born male since they can get it with a change to the gene on one X chromosome. People who have a family history of hemophilia are also at higher risk. What are the symptoms of hemophilia? The signs and symptoms of hemophilia are: Bleeding into the joints. This can cause swelling and pain or tightness in the joints. It often affects the knees, elbows, and ankles. Bleeding into the skin (which is bruising). Bleeding into the muscle and soft tissue, which can cause a build-up of blood in the area (called a hematoma). Bleeding of the mouth and gums, including bleeding that is hard to stop after you lose a tooth. Bleeding after circumcision. Bleeding after having shots, such as vaccinations. Bleeding in the head of an infant after a difficult delivery. Blood in the urine or stool. Frequent and hard-to-stop nosebleeds. In some cases, severe hemophilia may cause bleeding in the brain. This may cause brain damage and can be life-threatening. How is hemophilia diagnosed? To find out if you have hemophilia, your health care provider will: Ask about your medical history, including your symptoms and other health conditions you may have. Ask about your family history, to find out if you have relatives who have or had hemophilia. Do a physical exam to look for signs of hemophilia, such as bruising. Do certain blood tests to show if your blood is clotting properly. If it does not, then you will have clotting factor tests to diagnose the cause of the bleeding disorder. These blood tests would show the type of hemophilia and the severity. The

Related topics

• Bleeding Disorders