What Are Your Go-To Health and Medical References?

A friend called me recently with a health/medical question. And while I was able to give her my hunch as to what was wrong and what to do, as usual, I gave the disclaimer that "Don't forget: I am NOT a doctor, so you might want to fact check me!"

Of course, I'm always flattered when friends deem my years editing and writing about health issues as sufficient expertise to help handle their minor health issues. But when I am not sure about something—which is often—I just end up telling them I'll...