The reason for not having bowel movement for a few days may be caused by physiological factors such as diet, lack of exercise and spirituality, or pathologic factors such as insufficient gastric power and gastrointestinal diseases. 1, physiological factors: (1) Dietary factors: a few days without bowel movement may be caused by too little diet or too fine diet. If the patient eats less and drinks less water in recent days, it will lead to no bowel movement for a few days. If the patient usually eats a lot of fine food and consumes too little food with high crude fiber content, such as fruits and vegetables, it will lead to the inability to produce enough food residue, which will lead to the phenomenon of not having bowel movement for a few days. (2) Lack of exercise: If the patient is usually sedentary and does not have enough exercise, it will lead to slow gastrointestinal peristalsis, slow digestion and absorption of food, and constipation will occur. (3) Mental factors: when mental tension and stress, it can also lead to a few days without bowel movement. (2) Insufficient gastric power: not having bowel movement for a few days may be caused by insufficient gastric power. When the patient’s gastrointestinal power is poor, after the food is digested and absorbed in the gastrointestinal tract, the food residue keeps accumulating in the body and can not be excreted in time, the situation will occur. 3. Gastrointestinal diseases: If the patient himself suffers from gastrointestinal tumors, hemorrhoids and other diseases, it may produce a few days without stool. There may be other reasons for not having bowel movement for a few days, if the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.