A Japanese woman once told me that in her country, if you sneeze once it means somebody is saying something good about you but if you sneeze twice they are saying something bad about you. If that happens, she said, it's better to sneeze three times.
I asked her what it meant if we sneeze four times and she said, "It means you have a cold."
You probably don't have a "condition", Anonymous, but a conditioned reflex (Google it). It's just how your subconscious copes with stress.
