Hemophilia

Hemophilia is a group of bleeding disorders. It is caused by low amounts of specific clotting factors. These factors help to stop bleeding. The most common types of hemophilia are:

  • Causes

    Hemophilia is caused by a faulty gene located on the X chromosome.

    Females carry two copies of the X chromosome. If the faulty gene is only on one X, the normal gene on the second X will take over. As a result, they will not get the disease. Instead, they are carriers of the gene. The risk for their male offspring to inherit the gene is 1 in 2 or 50%. The chance that their female offspring will inherit the gene is also 50%. These female offspring will be carriers like their mothers.

    It is possible for a female to have hemophilia. For this to happen she must inherit the faulty gene from both her mother and her father.

    Males carry only one X chromosome. If they get the faulty gene, the disease will develop.

    It is possible for a new genetic mutation to occur. This means a person can get hemophilia even if neither parent carries a genetic mutation.

    Genetic Outcome Possibilities
    Fetus Chromosomes
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  • Definition

    Hemophilia is a group of bleeding disorders. It is caused by low amounts of specific clotting factors. These factors help to stop bleeding.

    The most common types of hemophilia are:

    • Hemophilia A (classic hemophilia)—accounts for 80% of all hemophilia (1 in 5,000 males), caused by too little factor VIII
    • Hemophilia B (Christmas disease)—occurs in 1 in 20,000 males, caused by too little factor IX

  • Diagnosis

    The doctor will ask about your symptoms and medical history. A physical exam will be done.

    Tests may include:

    • Tests to see how well your blood clots and blood tests to look for other causes of bleeding problems
    • Blood tests to measure the amounts of clotting factors present

  • Prevention

    There are no current guidelines to prevent hemophilia. However, if you have a family history of hemophilia, genetic counselors can help you figure out what risk your potential offspring may have.

  • Risk Factors

    Hemophilia mostly occurs in men. Your chances of hemophilia are also increased if you have a family member with hemophilia.

  • Symptoms

    Symptoms may vary depending on the severity of the disease. Bleeding is the main symptom, which is often brought on by injury or surgery. Hemophilia may go unnoticed until the infant becomes mobile. In severe cases, bruising occurs easily, and spontaneous bleeding into joints can cause joint pain. Symptoms in mild versions of hemophilia may not appear until later in life.

    Symptoms that can occur with hemophilia include:

    • Easy bruising
    • Severe nosebleeds
    • Blood in urine
    • Blood in stools
    • Heavy bleeding after minor cuts, bumps, dental work, or other trauma
    • Joint pain
    • Heavy menstrual bleeding in women who are carriers

  • Treatment

    Talk with your doctor about the best treatment plan for you. Options include: