There is a difference between gastroscopic staining and biopsy, which are two examination programs with different principles and uses. Gastroscopic staining is a routine examination of gastric and esophageal mucosal lesions through endoscopy by spraying a dye onto the mucosa of the digestive tract to increase the contrast between the normal and diseased mucosa and to make the lesions lighter and clearer. It is generally used to further observe mucosal lesions on the basis of ordinary gastroscopy. Gastroscopic biopsy is to take biopsy for section examination through gastroscope to clarify the nature of lesions and further determine whether there is cancer. During gastroscopy, if the doctor observes mucosal inflammation or occupying lesions, such as adenomas and polyps, in the esophagus, stomach or duodenum, in order to further diagnose the nature of the lesion, the cellular tissues of the suspected gastric lesions can be taken by biopsy forceps to carry out a pathologic examination. If you experience stomach pain or other symptoms, please consult a doctor who will select the appropriate examination program according to the situation.