The Force of Indigestion

I was watching Star Wars this weekend. I saw the original trilogy, but I noticed something this time that I never quite noticed before. How is it that the Jedi know when there's some disturbance in the Force? How do they know it's not just indigestion? Is there something in the years and years of training in the arts of kicking ass that lets them differentiate say, the death of another Jedi from acid reflux? How is it that they can tell the difference between a planet getting blown up by a Death Star and the bowl of alien curry from last night?

And what if he's wrong? What, just by chance, a Jedi eats a bean and cheese burrito, get's a little gassy and thinks the universe is going to end? What does he do then?