Skip to Content
United States National Library of Medicine National Institutes of Health

Health Information

Note: We cannot answer questions about individual medical cases, provide second opinions or make specific recommendations about therapy. Those issues should be discussed with your healthcare provider.

Back to Top
  • picture of a family smiling at the camera
  • Subscribe

    • Sign up to receive MedlinePlus announcements of new health topics, resources and news headlines.
  • Related Products/Services

    • Guide to Healthy Web Surfing
      Know what to look for when evaluating the quality of health information on the Web.
    • Libraries
      Consumer health libraries providing services to local residents
    • Health Hotlines
      Health-related organizations operating toll-free telephone services
    • DIRLINE
      Directory of health organizations online

Last reviewed: 16 June 2008
Last updated: 16 June 2008
First published: 21 April 2004
Metadata| Permanence level: Permanence Not Guaranteed