Vomiting after painless gastroscopy to remove gastric polyps may be related to the side effects of anesthesia as well as the stimulation of the gastrointestinal tract during the procedure. Doing painless gastroscopy requires general anesthesia, and patients may experience nausea and vomiting after waking up after the operation, which is generally accompanied by the metabolism of anesthesia in the body and gradually get better, and does not require special treatment. However, if it persists or worsens gradually, further medical treatment is needed. Gastric polyps more or the diameter of the gastric polyp itself is large patients generally operating time is long, in the operation operation may irritate the gastrointestinal tract, which can also cause the patient’s discomfort, manifested as nausea and vomiting after the operation. In addition, when doing gastroscopy, it is necessary to inject gas into the patient’s gastric cavity, in order to play the role of filling the gastric cavity. Some patients are more sensitive and exhibit severe bloating, causing nausea and vomiting in the patient. After gastric polyp surgery, you need to eat a light diet, and if you experience frequent vomiting, you should seek medical attention to find out the cause of the disease and treat it promptly.