Painless gastroenteroscopy refers to painless gastroscopy as well as painless colonoscopy. Painless gastroscopy does not require laxatives, while painless colonoscopy requires laxatives, usually at 3-4am if performed in the morning, and at 7-8am if performed in the afternoon. Painless gastroscopy and colonoscopy are examinations of the stomach and intestines by means of anesthesia, and only fasting is required during painless gastroscopy. However, a painless colonoscopy requires a laxative to clean out the intestines and facilitate observation. If the painless colonoscopy is performed in the morning, it is usually necessary to drink laxatives at 4 to 5 o’clock, and if it is performed in the afternoon, it is usually necessary to drink laxatives at 7 to 8 o’clock in the morning. When drinking laxatives, patients should pay attention to drink a lot of water, to be discharged into the watery secretion when the bowel cleaning is successful. Gastroscopy and colonoscopy will cause some irritation to the digestive tract, if the discomfort symptoms are more obvious need to communicate with the doctor in time, when the results of the timely medical assessment of the health of the digestive tract.