Cleansing to the end of the water sample is yellow, may be because of not clean, or suffering from gastroenteritis and other reasons. 1. Not clean: The purpose of bowel cleansing is to clean up the feces in the intestines so that it does not affect the colonoscopy. However, if the intestines are not cleaned out, then yellow water will flow out after the bowel cleansing. At present, it is necessary to continue to flush, or by drinking more water to accelerate intestinal excretion, until the yellow water becomes clear water. 2. Suffer from gastroenteritis: If the yellow water has been discharged before the bowel cleansing, bowel cleansing to the end of the yellow water does not disappear, then we must be vigilant is due to gastrointestinal inflammation. Inflammation stimulates the gastrointestinal mucosa, may cause acute diarrhea, stool discharge, water will be yellow. If you are sure that the infection is caused by inflammation, you should follow the doctor’s instructions as soon as possible to take oral medication for anti-inflammatory. Cleansing to the end of the water is yellow, there may be functional diarrhea or long-term diet due to inappropriate. If you have these conditions, you need to inform your doctor before purging.