Gastroscopy can be performed the day after taking colloidal bismuth pectin. Gastroscopy is a relatively common medical examination method, is the use of a special thin and soft tube, deep into the stomach in order to directly observe the esophagus, stomach and duodenum mucosa, 8 hours before the examination can not eat and water. Contraindications for gastroscopy include severe cardiopulmonary insufficiency, patients with unstable hemodynamics of acute gastrointestinal bleeding, large fluctuations in blood pressure, psychiatric patients and stroke patients. Colloidal bismuth pectin, as a kind of bismuth agent, has the effect of protecting gastric mucosa and does not affect the results of gastroscopy on the next day after taking it. Before gastroscopy, it is recommended to follow the doctor’s instructions for pre-gastroscopy preparation, and specific precautions can be consulted with professional physicians.