Mayo Clinic, need I say more? The site is easy to use and full of valuable information. Go to www.mayoclinic.org.
Are you diabetic or know a diabetic? The American Diabetic Association’s site could help you master diabetes. http://www.diabetes.org/
The Family Doc site covers the entire spectrum of medical care. Go to FamilyDoctor.org
Worried about your heart? Go to: heart.org
Easy to use, WebMD helps set the standard. http://www.webmd.com/
Believe it or not, the Center for Disease Control is a government agency that actually works well. A must if you are an international traveler. http://www.cdc.gov/az/
While. ZdoggMD is mainly a physician, I think there is much to be gained by listening to the doc’s opinions. Warning: He often uses potentially offensive language to make his point.
Another excellent site is KevinMD.
Feel free to respond with your favorite sites.