Having bowel movement but not defecating may be related to constipation, intestinal occupational lesions or intestinal obstruction. 1. Constipation: When intestinal dynamics are weakened, intestinal flora is imbalanced, and nutritional intake is not balanced, gastrointestinal dysfunction can occur, leading to constipation. When constipation occurs, the feces enters the large intestine, and the intestines are unable to push the excretion into the anus to be discharged out of the body, resulting in the intention to have a bowel movement but not defecation. 2. Intestinal space-occupying lesions: mainly refers to intestinal tumors, colorectal polyps, etc. In this case, feces enters the colon, and the diameter of the intestinal tract is reduced due to tumors or polyps, and feces can not pass through it, which leads to the patient’s intention to have a bowel movement but not to have a bowel movement. 3. Intestinal obstruction: when intestinal obstruction occurs, the peristaltic force of the intestines is weakened, and part of the intestinal segments are partially or completely obstructed, resulting in the feces not being able to pass through the obstructed area to reach the anus and be discharged out of the body. Once you have the urge to have a bowel movement but do not have a bowel movement, you should consult a doctor immediately to find out the cause of the disease and then treat it under the doctor’s guidance.