I have suffered incresingly from migraines. Every time I go sick with one I clearly put it down on the sick form. I own up to it at medicals. No mention of it has ever been made. Look at it this way, if you own up to it, and they decide to do something about it, then you might end up getting some help sorting the problem out (apparently most are due to an allergy to something). I wish someone would help me, they bloody well hurt!! Honesty is the best policy. How would you feel if you covered it up and ended up banging two jets together because you weren't concentrating on the job in hand?