A barium meal is a radiological test used to examine the digestive tract for diseases such as peptic ulcers and tumors. Barium meal is a kind of contrast agent, barium meal is through oral medical barium sulfate preparation, barium sulfate insoluble in water, insoluble in fat, can be in the role of X-ray to show whether there is a lesion of the digestive tract, usually used to check the esophagus, the stomach and the duodenum whether there are congenital malformations and ulcers, but also used for checking the gastrointestinal tract of the unknown hemorrhage and tumors and other diseases. The barium meal is non-toxic, painless, causes no complications, and has no side effects on the patient. It is necessary to drink a lot of water after the barium meal in order to eliminate the contrast medium as soon as possible. For patients with suspected or confirmed intestinal obstruction and acute stage of gastrointestinal bleeding, the use of barium meal is strictly prohibited.