Tummy pain before bowel movement may be caused by intestinal dysfunction, intestinal obstruction, intestinal occupying lesions, etc. It is mostly not a normal phenomenon, but tummy pain before bowel movement after intake of irritating food is mostly a normal phenomenon. 1. Abnormal phenomenon (1) Intestinal dysfunction: when suffering from intestinal dysfunction, it may cause intestinal spasmodic pain, especially before bowel movement, and the symptoms are more obvious. (2) Intestinal obstruction: For patients suffering from intestinal obstruction, during defecation, if the stool stimulates the obstruction area, it may also cause symptoms of stomach pain before defecation. (3) Intestinal space-occupying lesions: when suffering from intestinal space-occupying lesions, especially the lesions are relatively large, they may block the intestinal lumen, resulting in narrowing of the intestinal canal, causing the phenomenon of unobstructed bowel movement, which in turn leads to the symptom of tummy ache when having a bowel movement. 2. Normal phenomenon Some people may suffer from stomach pain before bowel movement due to fast intestinal peristalsis after eating irritating food, which is a normal phenomenon and can be relieved on its own. If the symptoms of stomach pain before bowel movement occur regularly, it is recommended to go to the hospital in time for colonoscopy and other tests to clarify the cause of the disease, and follow the doctor’s instructions to treat the cause of the disease.