Not having a bowel movement for four days is usually not normal, and once in a while is normal. Occasional bowel movements are usually not a problem, but if you have less than three bowel movements per week you may be constipated. Not having a bowel movement for four days in a row is usually abnormal and may be caused by gastrointestinal insufficiency, intestinal space-occupying lesions, and so on. It needs to be adjusted and treated according to the cause. 1. Insufficient gastrointestinal dynamics will affect the pushing of food to the distal end, which will affect the formation of stool; insufficient gastrointestinal dynamics will also affect the appetite, leading to a decrease in the patient’s diet, when the stool will decrease. It can be treated with gastrointestinal dynamics, such as domperidone tablets, and with digestive enzyme preparations, such as pancreatic enzyme tablets and multi-enzyme tablets. 2. Intestinal space-occupying lesions such as huge polyps in the colon, colorectal tumors, etc., leading to intestinal obstruction, stools can not be discharged smoothly. Surgery is needed to lift the obstruction, with other methods to actively treat the primary disease. There are many other reasons for not having a bowel movement for four days, so it is recommended to consult a doctor in time for a clear diagnosis and targeted treatment.