Taking laxatives to pass yellow water is generally not recommended for colonoscopy. Passing yellow water indicates that the feces in the intestines have not been completely cleaned out, which may have some effect on the colonoscopy view and test results. Before doing colonoscopy, patients are usually asked to take laxatives to clean up the feces in the intestines until they pull clear water, then colonoscopy can be performed. In this way, the patient’s intestinal condition can be better observed, and any abnormalities can be dealt with in a timely manner. If after taking laxatives, the patient pulls yellow water and has turned over the residue, indicating that the effect of intestinal clearance is not good, it is recommended to continue to drink water, more walking, to promote intestinal peristalsis until the discharge of clear water. After colonoscopy, anal discomfort, bloating and other symptoms may occur, it is recommended to pay attention to rest, and try to eat a light, easy to digest food.