Pancreatic cancer, especially at the head of the pancreas, may cause obstruction. Because the tumor grows up, it obstructs the descending duodenum, thus forming intestinal obstruction. The treatment is as follows: 1. Generally, the water-electrolyte balance is maintained by fasting, gastrointestinal decompression and intravenous nutrition; 2. If surgery is not possible, palliative surgery, such as rerouting and gastrointestinal anastomosis, can be performed to solve the patient’s eating problem; 3.