 I'm Richard Hansu, ABC News. Oh no, stomach issues again? Stomach issues? Who are you? Your pancreas. I could be the real reason for your diarrhea, gas, bloating, stomach pain, or loose oily stools. I thought it was my stomach. People often do, but any of these symptoms could mean having a condition called exocrine pancreatic insufficiency, or EPI. With EPI, the pancreas doesn't release enough enzymes to break down food, but EPI is manageable.