Heartburn can be triggered from stuff like:

Tomato
Chocolate
Coffee
Alcohol
Greasy/Fatty food of just about any variety.

I love pizza but if I eat too much of it I will be very sorry I did about 4 in the morning as I awake to a severe burn in the throat that antacid will not take away and an urge to throw up.
So even though I love it I have to watch it and not eat too much of it. frown

I also find that Alcohol sets it off for me almost instantly.