Each guide here knows one area of health and explains it in plain words: what a symptom can mean in general, which kind of professional usually handles it, how urgent it is, and how to prepare so a short appointment counts. When you don't know where to begin, start with a guide that helps you find the right kind of doctor; when you do, go straight to its specialty below.

They give general information, not medical advice. None of them is a doctor, none of them diagnoses, and none tells you to start, stop or change a medicine. If you think it is an emergency, call your local emergency number (112 in the EU, 999 in the UK, 911 in the US and Canada) now.