 I'm meteorologist Zelensky at Jenkins on WPA on East Radio 1090 and FM 11.5. 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.