The pancreas is located behind the peritoneum and the ultrasound is deeper, and the stomach and intestines in front of it produce a lot of gas when they are in operation. Once there is gas interference, the signal is not received during ultrasound examination and the pancreas is not clearly displayed. Most of the time, this is due to the fact that some patients do not follow the medical advice to fast for 12 hours, or their physical condition does not allow fasting, or it may be due to the patient’s poor metabolism and slow gastrointestinal peristalsis, which produces a lot of gas. Therefore, during the pancreatic examination, you should prepare your intestines in advance or take appropriate exhausting medication. If necessary, drink an appropriate amount of warm water during the examination to eliminate gas and allow the pancreas to be displayed more clearly.