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This sort of thing does exist, but the reason you don't see it so much, is that its generally too imprecise, and too prone to error. For example, let's say you're trying to assess something related to abdominal pain. Is the pain on the left, centre, or right, or multiple? Is it closer to the front, back, or both? How does the pain feel? Etc. Etc. Etc. Thats a lot of questions, all of which can significantly affect the likelihood of different diagnoses, and which may be somewhat subjective. At the same time, people can't be trusted to fill out the survey accurately (intentionally or not), getting worse the longer and more complicated it is. On the other hand, going through a doctor, you can in theory, assess symptoms more naturally and flexibly, while confirming their accuracy so insurance/government isn't spending on (supposedly) unnecessary procedures.