Accidentally eating a little something and not being in a state of fasting is usually not a good idea for gastroscopy. Before gastroscopy, it is generally necessary to fast for 6 to 8 hours and more to empty the stomach contents, so as to facilitate the observation of the gastric mucosa during gastroscopy and obtain better examination results. If you go for gastroscopy after eating, it may hinder the gastroscope’s examination of the gastric mucosa, which is not conducive to obtaining accurate diagnostic results, so you can’t do gastroscopy when the stomach is not emptied after eating. In addition, the gastroscope itself can stimulate the patient’s throat and esophagus, causing nausea, vomiting, etc., and the possibility of aspiration after eating is greatly increased, which can be life-threatening in serious cases. If you need to have a gastroscopy, you need to follow the doctor’s instructions to prepare for the gastroscopy, so as not to be unable to carry out a normal examination and delay the examination.