Both the head and tail of the pancreas are relatively important, as both are integral parts of the pancreas. If we have to distinguish the first and the second, the head part of the pancreas is relatively the most important and the tail part of the pancreas is relatively minor. Under normal circumstances, the head of the pancreas is adjacent to the duodenal jugular and is wrapped and surrounded by the curved part of the duodenum. The pancreatic duct grows from the tail of the pancreas and enters the duodenum at this site. In some people, the pancreatic duct first merges with the common bile duct before entering the duodenum, and most of this merging occurs in the intestinal wall of the duodenum. Because of the presence of this merging site, the duodenum is relatively enlarged in this area, which is called the pot belly. Because of the complexity of the structure, the head of the pancreas is relatively more serious once the lesion occurs.