In a certain number of cases, but there's also cases where you have symptoms which could go either way and you could be walking away to your own grave or greatly aggravating a condition that could have been minimized with prompt analysis and treatment.

Sure that wound will likely still heal with tape rather than stitches, that might be a bad sprain, that puking and blurred vision might just be migraine symptoms, and the problem moving your left arm might just be a pulled muscle from sleeping wrong.

Or, you might leaving and further stressing a fractured bone, poisoning, and a stroke.

Not everyone comes into the ER dripping blood or with a piece of rebar through their chest.