This is a comprehensive encyclopedia of over 500 conditions and diseases, with over 800 illustrations. Created by the faculty at Harvard Medical School, entries offer an overview of the condition along with a description of symptoms, diagnosis, tips for prevention, treatment options, prognosis, and advice about when to call a professional.
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.