Not having bowel movement for a few days may be related to dietary factors, insufficient intestinal motility, organic lesions of the intestinal tract and so on. 1. Dietary factors: such as eating too little, drinking too little water can cause constipation. If you eat too little, the pressure generated by the food and intestinal wall will be reduced accordingly, resulting in slower intestinal peristalsis, which in turn causes constipation. If you drink too little water, it will cause dry stools, but also lead to a lack of body fluids, which in turn affects the secretion of intestinal fluids. Insufficient secretion of intestinal fluid and insufficient intestinal lubrication will also cause poor bowel movement and even constipation. 2. Insufficient intestinal motility: decreased frequency of intestinal peristalsis leads to accumulation of food in the body, which can’t be discharged quickly, thus causing poor bowel movement. 3. Organic lesions of the intestinal tract: such as intestinal cancer and intestinal obstruction. Bowel cancer will affect the function of the intestinal tract, resulting in slower gastrointestinal peristalsis, causing poor bowel movement. It is also possible that the tumor becomes bigger, blocking the intestinal tract and obstructing bowel movement. If the bowel movement continues to be unsmooth, it is recommended to go to the hospital for systematic examination to identify the cause of the disease and treat the symptoms.