Bile reflux can be examined by gastroscopy, gastric aspirate test, and 24-hour intragastric monitoring. 1. Gastroscopy: Generally, bile reflux is mainly the reflux of bile into the stomach, and bile reflux can be observed through gastroscopy. This means that the stomach contains yellowish-green retained fluid, and yellowish-green mucus hangs on the stomach wall. 2. Gastric Aspirate Test: Gastric aspirate is mainly used to test the gastric fluid in the stomach, to check whether there is bile in the stomach and the bile content. Usually, fasting gastric fluid and postprandial gastric fluid are taken to measure the bile acid content. In general, bile reflux gastritis can be determined when the fasting bile acid measurement is greater than 30 μg/ml. 3. 24-hour intragastric monitoring: gastric acid in the stomach is strongly acidic, while bile and duodenal reflux fluid are basically alkaline, and if refluxed into the stomach, it can neutralize the gastric acid and increase the PH value in the stomach. Clinically, the PH value is usually used as a criterion. If the PH value is greater than or equal to 4.0, bile reflux can be diagnosed. The test is mainly to check the content of bile in the stomach and the degree of reflux, and also to know whether the bile reflux has caused any damage to the mucous membrane in the stomach. Therefore, in daily life, if there are such abnormalities, it is necessary to go to the hospital in time for examination and treatment in order to have a better and faster cure.