Feces means stool, which can empty the stool in the stomach. Under normal circumstances, the stool inside the stomach can not be completely emptied, because the intestinal tract is relatively long, there are folds on the top of the intestinal tract, which may lead to a small amount of fecal matter residue, and there will be no discomfort symptoms. If constipation occurs, it may lead to a large amount of stool in the intestines, and you need to take laxative medication, such as lactulose, to promote the discharge of stool. However, if you need to do a colonoscopy, you need to get rid of the stool inside the intestines, and often need to take stronger laxatives, such as compound polyethylene glycol electrolyte bulk, mannitol, etc., and pay attention to drink more water during the period. All of the above drugs need to be taken under the guidance of a doctor, do not take on your own.