The pancreas is a long, flat gland that sits behind the stomach. Its main functions are to produce digestive enzymes and hormones that regulate blood sugar levels. A cyst is a sac-like pocket of membranous tissue that contains fluid, air or other substances. There are several types of cystic growths of the pancreas, each with malignant potential that varies from nearly zero to up to 70% depending on the type. Pancreatic cysts can cause symptoms of abdominal pain, persistent nausea/vomiting, and in more serious cases, jaundice (yellowing of the skin/eyes) and weight loss.