Hemophilia

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Basics

• Summary
• Start Here
• Diagnosis and Tests
• Treatments and Therapies

Learn More

• Related Issues
• Genetics

See, Play and Learn

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Research

• Statistics and Research
• Clinical Trials
• Journal Articles

Resources

• Find an Expert

For You

• Children
• Women
• Patient Handouts

Summary

Hemophilia is a rare disorder in which the blood does not clot normally. It is usually inherited. Hemophilia usually occurs in males.

If you have hemophilia, you have little or no clotting factor. Clotting factor is a protein needed for normal blood clotting. Without it, you may bleed for a long time after an injury or accident. You also may bleed into your knees, ankles, and elbows. Bleeding in the joints causes pain and, if not treated, can lead to arthritis. Bleeding in the brain, a very serious complication of hemophilia, requires emergency treatment.

The main symptoms of hemophilia are excessive bleeding and easy bruising. Blood tests can tell if you have it. The main treatment is injecting the missing clotting factor into the bloodstream. You may need it on a regular basis, or just when bleeding occurs.

NIH: National Heart, Lung, and Blood Institute

Start Here

• Hemophilia (World Federation of Hemophilia)
• Hemophilia Facts (Centers for Disease Control and Prevention)
• Learning about Hemophilia (National Human Genome Research Institute)
• What Are Bleeding Disorders (National Heart, Lung, and Blood Institute) Also in Spanish

Diagnosis and Tests

• Coagulation Factor Tests (National Library of Medicine) Also in Spanish
• Diagnosis of Hemophilia (Centers for Disease Control and Prevention) Also in Spanish
• Partial Thromboplastin Time (PTT) Test (National Library of Medicine) Also in Spanish
• Prothrombin Time Test and INR (PT/INR) (National Library of Medicine) Also in Spanish

Treatments and Therapies

• Treatments for Blood Disorders (National Heart, Lung, and Blood Institute) Also in Spanish

Related Issues

• Carriers and Women with Hemophilia (World Federation of Hemophilia)
• Inhibitors (Centers for Disease Control and Prevention)

Genetics

• Hemophilia: MedlinePlus Genetics (National Library of Medicine)

Statistics and Research

• Hemophilia Data and Statistics (Centers for Disease Control and Prevention)

Clinical Trials

• ClinicalTrials.gov: Blood Coagulation Disorders (National Institutes of Health)
• ClinicalTrials.gov: Hemophilia A (National Institutes of Health)

Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)

• Article: Gait Alteration Due to Haemophilic Arthropathies in Patients with Moderate Haemophilia.
• Article: Hidden blood loss of total knee arthroplasty in hemophilia arthritis: an...
• Article: Correlation Analysis of DNA Methylation in the von Willebrand Factor Promoter...
• Hemophilia -- see more articles

Find an Expert

• Find a Hematologist (American Society of Hematology)
• National Heart, Lung, and Blood Institute

Children

• Blood Test: Factor IX Activity (For Parents) (Nemours Foundation)
• Hemophilia (For Parents) (Nemours Foundation)

Women

• Carriers and Women with Hemophilia (World Federation of Hemophilia)

Patient Handouts

• Hemophilia (Medical Encyclopedia) Also in Spanish
• Hemophilia A (Medical Encyclopedia) Also in Spanish
• Hemophilia B (Medical Encyclopedia) Also in Spanish
• Partial thromboplastin time (PTT) (Medical Encyclopedia) Also in Spanish