The causes of pooping after eating include irritable bowel syndrome, pelvic inflammatory disease, rectal cancer and so on. 1. Irritable bowel syndrome: due to high mental stress, tension, anxiety and other factors, the patient’s intestines are more sensitive. Thus, when the patient eats, it will stimulate the intestines, causing the patient to have symptoms of defecation. 2. Pelvic inflammatory disease: If there is inflammatory infection in the patient’s pelvis, due to the continuous spread of inflammatory factors, it will produce stimulation to the rectum, causing the patient to have bowel movements. Thus, it will cause the patient to want to have a bowel movement after eating. 3. Rectal cancer: if the patient has tumor lesions in the rectum, due to the food entering into the gastrointestinal tract, it will stimulate the mucous membrane of the gastrointestinal tract, thus causing the patient to have the urge to have stool. Due to the occupation of tumor, it causes narrowing of rectum, which leads to the patient’s situation of defecation. If the patient frequently needs to have a bowel movement after eating, it is recommended that the patient go to the hospital in time. Improve the relevant examination, clarify the cause of the disease, and follow the doctor’s instructions for treatment, so as not to delay the condition.