Precautions before painless gastroenteroscopy include routine examination, diet and medication precautions, etc. Precautions after painless gastroenteroscopy include hospitalization and life precautions. 1. The precautions before painless gastroenteroscopy include: routine checking of blood, electrocardiogram, coagulation function and other items; if you are taking anticoagulant drugs, it is recommended that you stop taking the drugs for more than three days before the examination. Before the examination, it is recommended to abstain from food and water for more than 8 hours; the day before the examination, you need to eat a light diet, do not eat spicy and stimulating, greasy, fried, barbecue, raw and cold food, do not drink alcohol; before the colonoscopy, you need to take intestinal cleansing medication in accordance with the doctor’s instructions. 2. The precautions after painless gastroenteroscopy are: after the examination, it is recommended to rest in the hospital for at least half an hour or more, and then leave if there is no discomfort; due to the use of anesthetic drugs in painless gastroenteroscopy, it is not recommended to drive and work at height on the day of the examination; after painless gastroenteroscopy, it is recommended to fast at least 2 to 4 hours, and then return to a normal diet from fluids and semi-fluids.