We have all done it, typed a headache into a symptom checker and somehow ended up convinced it is something serious, and that is exactly the problem with these apps. They are useful as a rough guide, but their accuracy is limited, and knowing how to use them without spiraling is the real skill.The honest accuracy picture is that symptom checkers get the top diagnosis right less often than you would hope, with studies showing they are right about a third of the time at best, and more often they are in the right general area but wrong on the specifics. The danger is the opposite direction too, because they tend to over-flag serious conditions, which is why a quick search for a stomachache can end with you reading about things you do not have.
They are a triage tool, not a
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