Health A to Z
The A to Z library is a collection of articles covering many of the most commonly searched medical conditions. Each article contains a description of the condition; the symptoms; how it is diagnosed, prevented, and treated; the prognosis; and when to seek professional advice.
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Disclaimer:
As a service to our readers, Harvard Health Publishing provides access to our library of archived content. Please note the date of last review or update on all articles.
No content on this site, regardless of date, should ever be used as a substitute for direct medical advice from your doctor or other qualified clinician.
