You should not eat before having an enema, which removes substances from the intestines. If you eat, it may affect the effectiveness of the test. Enema is usually a certain amount of solution through the anus, rectum, into the colon, to help the body feces out of the body, commonly used in preoperative intestinal cleaning or disease treatment. If you eat before the enema, it will lead to the intestinal food residue can not be cleaned, if it is the enema before the examination, it may lead to the examination can not be seen clearly, affecting the effectiveness of the examination, so it is not recommended to eat before doing the enema. If there is discomfort during the enema, you need to inform the doctor in time and stop the enema immediately to avoid complications, if you need an enema you need to do it under the operation of the doctor.