The lack of stool may be a result of eating less recently and producing less waste. It may be a case of irritable bowel syndrome caused by intestinal dysfunction and plant nervous dysfunction. It has a lot to do with one’s diet, exertion, stressful emotions, insomnia, etc. In some cases, it is also related to long-term alcohol consumption or eating spicy and stimulating food. If there is a constant urge to have a bowel movement, but not much each time, it is medically known as urgency. If it is accompanied by diarrhea, abdominal pain or nausea or vomiting, it is mostly an infectious lesion caused by acute enteritis or acute gastroenteritis. If it is accompanied by blood in stool, increased frequency of defecation, change in the shape of stool, mucus and blood stool or unexplained wasting and anemia, the possibility of malignant tumor of the colon and colorectum should be considered at this time.