Butterflies in my stomach?

What is the physiological cause of “butterflies” in the stomach?

Eating caterpillars.

There was a recent article in U.S. News and World Report about this. To summarize, there is a large network of nerves in the abdomen that acts as a secondary nervous system. To quote from the article:

ATTGuy, I almost peed on myself when I read that! (I know, I don’t get out much…but I’m working on it!)

Great cite, Gilligan. Usually, I only used to get butterflies in my stomach when I was nervous about something, but lately I have been getting them when I think about a certain subject that stresses me out (a recent breakup). I was wondering why that is happening, and now I know. Thanks again.