Diarrhea clinically as diarrhea symptoms, the possible causes are caused by irritable bowel syndrome, dyspepsia, acute enteritis, ulcerative colitis and so on. 1. Irritable bowel syndrome: the specific causes and mechanisms are not clear, but may be related to food factors, intestinal infections, etc., often leading to persistent or intermittent diarrhea, but the amount of feces is relatively small. 2. Indigestion: it may be caused by gastrointestinal dyskinesia, improper diet, etc. As the food can not be fully digested, part of the food will be discharged with the feces, resulting in diarrhea, often accompanied by a decrease in appetite and gastric distension. 3. Acute enteritis: it may be caused by intestinal viruses, bacteria, parasitic infections, etc. It often leads to diarrhea, abdominal pain, vomiting and other symptoms. 4. Ulcerative colitis: the cause is not clear, but may be related to immune factors, intestinal microbial infections, genetic factors, etc. The main symptom is diarrhea accompanied by mucus, pus and blood stools, in mild cases, the bowel movement is 2-3 times a day, and in severe cases, the bowel movement may be more than 10 times a day. Diarrhea may also be caused by other reasons, it is recommended to go to the gastroenterology department of the hospital in a timely manner to identify the causes, cooperate with the doctor to take treatment, avoid self-medication, delay the condition.