1, when taking anesthetic, the last two bites in the throat for a few seconds before swallowing. Some patients may experience nausea after taking anesthetic, so please wait for a while after taking anesthetic and enter the gastroscopy room for examination after nausea disappears. 2.After entering the examination room, please present your receipt for payment, then take off your shoes and get on the operating table, lying on your left side, please remove your dentures and loosen your trouser belt before the operation. 3, during the examination, please try to relax, remember to breathe in deeply through the nose, exhale deeply through the mouth and gasp slowly when you are nauseous, this can effectively prevent vomiting. When there is secretion in the mouth, let it stay out freely, do not swallow, otherwise it can cause choking and coughing. 4, remember to bite the dental pad, no matter when you can not spit out the dental pad, otherwise it will damage the mirror.