When you get a stomachache,
it might be an actual problem right in your stomach, but not necessarily. The problem
could be in your abdomen.
Your abdomen is more than your stomach and more than your intestines. It's the whole
area between your chest and your hipbones.
Peritonitis is when the tissue that covers the inside wall of the abdomen gets
swollen and irritated, usually due to an infection. Appendicitis can cause peritonitis
if it isn't treated before the appendix bursts.