Rattling stomach, small abdominal pain, unformed stool with mucus may be physiological reasons, but also may be caused by bacterial dysentery, ulcerative colitis, irritable bowel syndrome and other diseases. 1. Physiological reasons: when the abdomen is cold or improper diet, such as eating too much greasy, cold, spicy and stimulating food, resulting in gastrointestinal tract dysfunction, food indigestion, there may be stomach ringing, abdominal pain, stools are not shaped with mucus symptoms. 2. Bacterial dysentery: Bacterial dysentery can lead to intestinal mucosal congestion and edema, necrosis, may have the symptoms of stomach ringing, abdominal pain, stools are not shaped with mucus, but also may have the symptoms of urgency and heaviness (the lower abdomen is uncomfortable, want to relieve the bowels, and there is a feeling of incomplete defecation after defecation), fever and other manifestations. 3. Ulcerative colitis: ulcerative colitis is a kind of inflammatory bowel disease, is an autoimmune disease, the intestinal mucosa has inflammatory exudation, ulcer formation, bleeding, but also can have the stomach ringing, abdominal pain, stools are not shaped with mucus clinical symptoms, stools can also be with pus and blood. 4. Irritable bowel syndrome: Irritable bowel syndrome is a functional bowel disease, often associated with psychosomatic factors, and there is no organic changes, but also appear the above symptoms. If the stomach rattling, small abdominal pain, stools are not shaped with mucus, after excluding the physiological causes, you should go to the hospital, under the guidance of the doctor for treatment.