Hemophilia A

Common Symptoms

The major signs and symptoms of hemophilia A are bleeding and bruising.
Bleeding often occurs internally in joints and muscles. If bleeding in the brain occurs, it is considered a medical emergency.
Hemophilia A symptoms can be:
  • Mild
  • Moderate
  • Severe.
The severity of hemophilia symptoms is determined by the amount of clotting factor in the blood. Most people (about 7 out of 10) with hemophilia A have the severe form. People who do not have hemophilia have a factor 8 activity of 100 percent; people who have severe hemophilia A have a factor 8 activity of less than 1 percent.
(Click Hemophilia Symptoms for more information about the symptoms of hemophilia A.)

Diagnosing Hemophilia A

A doctor making a hemophilia A diagnosis will usually need to:
  • Review the patient's personal and family medical history
  • Perform a physical examination
  • Order blood tests.
The tests will indicate:
  • Whether you have a bleeding problem
  • If the bleeding problem is due to hemophilia A or another cause
  • How severe the disorder is.
(Click Diagnosing Hemophilia to learn more about how hemophilia A is diagnosed.)

Hemophilia Disease

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