Whether you can drink water for colonoscopy should depend on the specific situation, which is divided into before and after colonoscopy, and is related to whether the colonoscopy contains anesthesia or not.1. Before colonoscopy: if the colonoscopy does not contain anesthesia, you can drink a small amount of water before the colonoscopy, and if you drink too much water, it may lead to nausea and spit out the water, which will easily aggravate the abdominal distension in some patients. If the colonoscopy is anesthesia, you usually can’t drink water within 4 hours before the examination, because the process of colonoscopy can easily lead to choking and asphyxiation, etc.; 2. After the colonoscopy: after the colonoscopy, if you don’t feel sick and have a normal intestinal excretion, you can drink a small amount of lukewarm water, and avoid drinking iced water to stimulate the gastrointestinal tract and cause intestinal cramps. For anesthesia colonoscopy, after the end of the anesthesiologist needs to be assessed by the anesthesiologist, need to wait for the patient to regain consciousness before trying to drink a small amount of water, so as to avoid confusion caused by drinking water into the trachea by mistake, which may cause choking and coughing or even asphyxiation, and at the same time need to pay attention to drinking water should be taken as much as possible in a sitting position, avoiding lying down to drink water. Enteroscopy may cause damage to the intestinal mucosa, it is recommended that the patient’s diet after the examination is based on light and easy-to-digest fluids, such as egg custard, noodles, egg soup, gruel with chopped vegetables, etc., and do not overeat and should try to chew and swallow slowly, which will help protect the gastric mucosa and avoid causing bloating and abdominal pain.