i can't quite pinpoint why, but this was by far one of the weirdest conversations i had this morning:
maidenanne83: what's sinus?
rainybluesky: um... like nasal cavity problems?
maidenanne83: have you ever had it?
rainybluesky: not really
rainybluesky: it's not really a condition
rainybluesky: it's a physiological term
rainybluesky: like your sinuses
maidenanne83: what on earth is it? oh...
rainybluesky: "my sinuses are acting up" -- that means like your nose, throat and ears feel stuffed up or inflamed