Postprandial gallbladder is not a disease, it is a form of ultrasound that the ultrasound doctor looks at when doing ultrasound operations. It’s when you eat, and after eating the bile is going to flow into the intestinal bowel to help digestion, so the gallbladder is emptied of bile. The gallbladder is like a deflated balloon, and when the ultrasound doctor describes this gallbladder, he gives the diagnosis of postprandial gallbladder, so it is not a disease. It is recommended that patients should fast for at least 4-6 hours during abdominal ultrasound, because there is a lot of gas in the abdominal organs like the intestinal canal, which can affect the ultrasound doctor’s judgment of other organs, and after eating, the bile is completely emptied from the gallbladder, so the gallbladder is deflated and the things inside the gallbladder cannot be seen clearly, so it is better to do ultrasound, abdominal ultrasound, on an empty stomach.