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You can get the rough strokes from looks. Blood tests give you more specific information on what is wrong, if anything.
Meh, that is lazy medicine IMHO and at the same time, it says a lot about the health system and its practitioners. We need better educated more empathetic doctors who go beyond looking at someone to make assumptions about someone’s health.
I would say that this is a problem of lacking resources, not laziness. I’ve never met a doctor that didn’t have a constant stream of patients and non-stop work to do.