We’ve all done it: You plug your aches and pains into WebMD’s Symptom Checker, see that it could be either “cancer” or “seasonal allergies,” and promptly close out the window and decide to ignore ...

Online and mobile symptom checkers like WebMD, AskMD, iTriage, and even offerings from the Mayo Clinic and the UK's NHS, come up with an accurate diagnosis only about a third of the time, according to ...