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Every other tool on this site asks you to already know the question — which product, which ingredient, which medicine. Nobody starts there. Pick the thing you have noticed and this page works backwards: the causes worth ruling out, the ones that need an appointment rather than a purchase, and a handful of questions that tell you which of them fits.
None of these pages diagnose anything. They exist so you arrive at an appointment with a date, a pattern, and a specific question instead of an apology for wasting anyone’s time.
Educational information about why a symptom happens — not a diagnosis, and not a way to work out what is wrong with you. Most of these changes have more than one cause at once, and the causes on this page overlap. Nothing here can examine you, look at your history, or run a test. Pain, bleeding, a lump, or a symptom that is new and unexplained always deserves assessment.