Pancreatic exocrine insufficiency (PEI) is a condition in which there is insufficient delivery of pancreatic enzymes to the small bowel. This may be due to previous pancreatic or gastric surgery, acute and chronic pancreatitis, among other less common disorders.
The result is the incomplete digestion and subsequent malabsorption of the nutrients, especially fat, in food. This may give you symptoms such as abdominal cramping, bloating, and diarrhea.
With more severe enzyme deficiency you may develop pale, smelly stools and notice fat droplets in the toilet bowl.