“How sick a patient looks is just a clue, a single piece of information. Alone it is practically meaningless.”
-“Every Patient Tells a Story: Medical Mysteries and the Art of Diagnosis“, Lisa Sanders M.D.
This quote is taken directly for the book referenced above. The statenment is simply, but the concept behind it is a substantial one that all medical personal should acknowledge. A patient with a simple virus can appear to be deathly ill, while someone with a life-threatening complication may look completely normal in appearance.
Do not make the mistake of diagnosing a patient based on visual cues alone. Further investigation is always worth the extra effort to prevent misdiagnosis and failure to treat a life-threatening complication.