Email this page To: From: Subject: Message: What is hemophilia - Hemophilia is a genetic (usually inherited) disorder that causes a person to have less clotting protein. Learn about the types of hemophilia and more about managing care for your child. - https://www.stjude.org/treatment/patient-resources/caregiver-resources/patient-family-education-sheets/hematology/what-is-hemophilia.html A summary of this page will be sent along with your message I am a referring physician Yes, I would like to receive email updates. Send Email Your message has been emailed successfully. Thank you for your interest in St. Jude Children's Research Hospital.