Assertion: hemophilia's condition | /r/Synonym | hemophilia a.
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text: People who have a deficiency or defect in factor VIII experience excessive bleeding because their blood does not clot properly, a medical condition called hemophilia A. (Hemophilia B, which is even rarer, is caused by a deficiency or defect in another clotting factor called factor IX.)
text: The term is most commonly used to refer to two specific conditions known as hemophilia A and hemophilia B, which will be the main subjects of this article.