I hate that! They don't even go toilet unless they need to find a hidden killer/rob the house/change hair colour/eavesdrop on conversations/randomly disappear for a few days/poison the water/climb into the ventilation system, etc.
It's getting a bit annoying how many people feel the need to point out the absence of small everyday occurrences in movies. In a good movie, anything as pointless as an illness that has absolutely no affect on the plot should be left out, or even more people would be complaining about what is referred to as "filler".
they usually cough up blood too
Because when you aren't paying attention they put their finger under their nose to stop from sneezing, obviously.
oh right!! silly me! haha