SS, yes it can as unfortunately one of my pax found out.
In.itself a headache is nothing but the point I was trying to make is that even things which "appear" simple can be otherwise, the important part is asking the right questions and knowing what other symptoms to look out for. If in doubt, refer it to Medlink as that is what they are paid for.
I would have thought up front would prefer the conservative approach but by all means if you think crew questioning things that don't "feel right" is silly go ahead, the diversion will be good practice for the next PPC I suppose.
In my time I had no less than 7 incidents where pax were offloaded with developing conditions that airborne would have necessitated diversion.
Two of those were a result of crew overhearing pax conversations and feeling something "wasn't right"