Gastroscopy is currently the best method to diagnose gastric and duodenal disorders, especially peptic ulcers and tumors. Although gastroscopy has the advantages of being safe, easy to operate and highly applicable, its safety and correct assessment require the patient’s attention and cooperation. Precautions before examination 1. Try to relax and avoid excessive tension. In general, gastroscopy is a less painful examination method, and the doctor can directly see the situation of the examined organ, which is better than barium X-ray meal examination. It can visually discover the lesion, initially determine the nature of the lesion, and if necessary, can also take a small specimen at the lesion site, for pathological examination, under the microscope to see the condition of the lesion cells. 2.If barium meal examination has been done, because barium meal barium may be attached to the gastrointestinal mucosa, especially the site of ulcer lesion, making gastroscopic diagnosis difficult, so it must be done 3 days after the barium meal examination and then gastroscopic examination. 3.Fast food and water should be fasted after 12:00 pm on the night before the examination, and do not eat breakfast in the morning of the examination day. 4.Laboratory tests such as viral hepatitis index should be done before the examination to avoid cross infection. 5.Bring ECG test results (mandatory for those over 50 years old). 6.After entering the examination room, follow the doctor’s instructions, loosen the collar and trouser belt, remove the dentures and glasses, and take the left side lying position. Second, the examination precautions during the examination nasal inhalation, mouth exhalation; saliva outflow, do not swallow to avoid choking and coughing. After entering the mirror, the body and head should not be turned to prevent damage to the mirror and injury to internal organs. There will definitely be discomfort, such as nausea, abdominal distension, abdominal cramps, which should be tolerated appropriately. If you really cannot tolerate it, you can indicate to the surgeon (doctor or nurse) with hand signals so that necessary measures can be taken. C. Precautions after the examination 1. Saliva should be spit out after the examination. As some air is injected during the examination, although it has been sucked out when retiring the mirror, some people still have obvious abdominal distension and more belching, which is a normal phenomenon. 2, because of the pharyngeal anesthesia, there will be a foreign body feeling in the throat after the examination, do not cough violently. 3.Because the anesthesia has not disappeared, eating too early will make the food enter the trachea easily, so you can eat water only 2 hours after the examination. If pathological examination is performed (the doctor will inform you), you should eat warm and cool semi-liquid or soft food for one day after 2 hours of examination to avoid bleeding caused by rough food rubbing against the gastric mucosa wound. 4, 1 to 4 days after the examination, you may feel discomfort or pain in the throat, but most of them are not hindered by eating and drinking, and you can work as usual.