The etiology of the symptoms of bloating and diarrhea is complex, and can be caused by acute gastroenteritis, irritable bowel syndrome, ulcerative colitis and other factors, and should go to the hospital in a timely manner. 1. Acute gastroenteritis: mostly due to unhygienic diet or cold and other factors, resulting in local inflammatory infiltration of the gastrointestinal tract, mucosa and submucosal tissue congestion and edema, resulting in increased pressure in the gastrointestinal tract, combined with gastrointestinal peristalsis accelerated, abdominal distension and dilution of symptoms can occur. 2. Irritable bowel syndrome: mostly due to mental stress, gastrointestinal microecological disorders and other factors, resulting in gastrointestinal tract dysfunction, intake of food can be due to gastrointestinal contraction and peristalsis speed changes, can be manifested as symptoms of abdominal distension and diarrhea. 3. Ulcerative colitis: mostly caused by intestinal inflammation, immunity and other factors, leading to intestinal mucosa and submucosal tissue inflammatory infiltration, causing intestinal mucosal necrosis to form ulcers, when the food residue through the intestinal ulcer site, can stimulate intestinal peristalsis abnormalities, which can lead to bloating and dilution symptoms. In daily life, attention should be paid to dietary hygiene, avoiding the intake of spicy and stimulating foods to prevent the condition from worsening. If the symptoms of bloating and diarrhea persist, go to the hospital in time and follow the doctor’s instructions for treatment.