While many online health-oriented websites offer symptom checkers that allow a user to enter symptoms, none of the results should be considered an actual diagnosis, as WebMD points out. Symptom checkers such as those offered by WebMD, Patient, and Everyday Health should be used for informational purposes only.
Symptom checkers typically allow users to enter multiple symptoms, sometimes providing users with categories of symptoms from which to choose. For instance, Everyday Health's symptom checker lets users choose from constellations of symptoms for bipolar disease, cancer, flu, yeast infections and more. WebMD encourages users of its symptom checker not to ignore medical advice based on the results of the symptom checker, and to seek emergency medical help when needed.