Frequent abdominal pain with diarrhea, the common causes are organic lesions, occupational lesions, functional bowel disease and other diseases. 1. Organic lesions: such as ulcerative colitis and other inflammatory bowel diseases, the colonic mucosa is widely affected, the patient will have abdominal pain, diarrhea, and diarrhea, and increase in the number of times, change in stool characteristics, manifested as mucus, pus, blood, and even anemia and other changes; 2. Occupational lesions: such as colonic tumors, may cause abdominal pain, diarrhea, or a sense of incomplete bowel movement, the surface of the stool may be with blood or tarry stool; 3. Functional bowel disease: such as irritable bowel syndrome, due to emotional tension, stress will appear somatization of symptoms, at this time the examination of the routine stool may not have obvious infected manifestations, colonoscopy may not have obvious organic lesions of the changes. However, before diagnosing functional bowel disease, it is necessary to exclude whether there are organic lesions; 4. Other lesions: such as chronic colitis, ischemic bowel disease, radiation enteritis and intestinal infections caused by unclean diet may cause some manifestations of diarrhea and abdominal pain. Frequent abdominal pain and diarrhea need to pay attention to the situation, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to improve the relevant examination, clear cause after systematic treatment.