You don't need a PhD in physiology to know that stress can be hard on the stomach. We've all done our own experiments on the subject, intentionally or not. Remember how you felt the last time you spoke in public? Those butterflies weren't in your head.
Stress a major player
The impact of stress on the stomach goes far beyond indigestion, however. In recent years, doctors have uncovered a remarkably complex connection between the brain and the digestive system. The entire system is extremely sensitive to our moods.