Diarrhea without blood in stool can be caused by poor diet, infectious bowel disease, gastrointestinal power disease and other factors. 1. Poor diet: irregular diet, eating too much spicy stimulation, fried, cold, greasy food and drinks, can cause intestinal dysfunction, intestinal peristalsis accelerated, which leads to indigestion, triggered by diarrhea symptoms, usually does not occur in the blood stool. 2. Infectious bowel disease: due to various causes of intestinal inflammation, common diseases include bacterial enteritis, bacillary dysentery, viral enteritis, etc., which may cause diarrhea symptoms, but blood in the stool is less likely to occur. 3. Gastrointestinal dynamics disease: due to mental factors, food allergies, food intolerance and other factors, can lead to the occurrence of irritable bowel syndrome, gastrointestinal dynamics disorder, resulting in the occurrence of diarrhea. If you have diarrhea without blood in the stool, you should consult a doctor in a timely manner, and under the guidance of a specialist, you can actively pursue appropriate treatment to help alleviate the symptoms as soon as possible.