Gastroscopy shows a large amount of residue in the fundus of the stomach Consider inadequate preparation before the examination, functional dyspepsia, gastritis, gastric masses and other conditions. 1. Inadequate preparation before examination: Fasting is required for 4~6 hours before the examination so that the gastric mucosa can be observed more clearly after gastric emptying to see whether there is any lesion. If you eat too much food, eat poorly digested food, etc., you need to extend the fasting time, otherwise there will be food residues in the stomach. 2. Functional dyspepsia: due to gastric dyspepsia, gastric digestive function decreases, food can not be discharged into the intestines in a timely manner, thus stored in the stomach. 3. Gastritis, stomach swelling: these also affect the gastric digestive function and belong to organic indigestion. Patients mostly have symptoms such as acid reflux, heartburn, fatigue, weight loss, etc. Mucosal lesions can be found under gastroscopy. For cases where gastroscopy shows a large amount of residual material in the bottom of the stomach, the cause needs to be analyzed by the doctor in the context of the individual’s actual situation.