Lower abdominal pain, relieved by bowel movement, may be caused by gastroenteritis, irritable bowel syndrome, ulcerative colitis and other diseases. 1. Gastroenteritis: pathogenic microorganisms cause gastrointestinal infection, causing gastrointestinal mucosal congestion and edema, inflammation occurs, and when feces pass through the intestinal tube, it can cause intestinal spasms, causing abdominal pain. When the feces passes through the intestine, it can cause intestinal spasm, causing abdominal pain. When the feces is discharged, the abdominal pain can be alleviated or disappear. 2. Irritable bowel syndrome (IBS): it is a kind of functional enteropathy without organic lesions of the intestine, the pathogenesis includes abnormal gastrointestinal dynamics, increased intestinal sensitivity, mental and psychological disorders, etc. Abdominal pain with change of defecation habit can occur, and the abdominal pain is mostly relieved after defecation or elimination of gas. 3. Ulcerative colitis: it is a chronic non-specific intestinal inflammatory disease, the intestinal tract in the role of various factors, the intestinal mucosa appear erosion, ulceration, cryptorchiditis and so on. When feces passes through the intestinal canal, it can stimulate the intestinal tract, triggering painful intestinal spasm, and after defecation, the abdominal pain is relieved. There are many other reasons for the appearance of abdominal pain with relief after defecation, and it is recommended to consult a doctor in time for a clear diagnosis and standardized treatment.