Hemophilia A

How Common Is It?

Hemophilia A is the most common type of hemophilia, affecting 1 in 5,000 to 10,000 males worldwide.

Other Names for Hemophilia A

Other names for hemophilia A include:
  • Classic hemophilia
  • Factor 8 (VIII) deficiency.


Key information about hemophilia A includes the following:
  • It is the most common type of hemophilia, which is a rare, inherited bleeding disorder.
  • Hemophilia A almost always occurs in males.
  • A baby born with hemophilia A has a problem with certain proteins in the blood, called factor 8 clotting factor. Clotting factors helps blood clot.
  • Hemophilia A can be due to a low level of clotting factors or due to a clotting factor that is completely missing.
  • When clotting factors are missing, or your body does not have enough clotting factors, it can take a long time for your blood to clot after an injury or accident. Bleeding often occurs internally.

Hemophilia Disease

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