Generally most patients will have stomach pain for a few days after painless gastroscopy, which is a normal phenomenon. First of all, painless gastroscopy requires the injection of anesthetic drugs, drugs into the bloodstream, resulting in patients with anesthesia, part of the anesthetic drugs will enter the gastrointestinal tract, affecting the gastric mucosa to appear gastric wall edema, resulting in gastric pain response. Moreover, when the patient’s gastroscopy operation, it is inevitable that the gastric mucosa will be damaged, resulting in gastric mucosal edema, erosion, sensitivity to gastric acid, stomach pain after gastroscopy, which is a normal physiological phenomenon. In addition, during the gastroscopy operation, gas will be injected intraperitoneally, which will also cause post-gastroscopy stomach distension. If abnormal tissue is observed under the gastroscope, clamp biopsy will also occur clamping site damage pain, therefore, a few days of stomach pain after painless gastroscopy is normal, do not worry too much. If the pain persists after painless gastroscopy, you should go to the hospital.