Lower abdominal pain and diarrhea need to identify the cause, may be acute enteritis, irritable bowel syndrome, bacillary dysentery, etc., need to be under the guidance of the doctor targeted treatment, such as drug therapy. 1. Acute enteritis: mainly caused by acute infection of the intestinal tract, manifested as abdominal pain, diarrhea, nausea, vomiting, loss of appetite, etc., and in severe cases, dehydration, electrolyte disorders, shock. Severe abdominal pain can be given scopolamine and other antispasmodic and analgesic treatment; caused by infectious factors, for the corresponding pathogenic microorganisms to give anti-infective treatment, such as gentamicin and so on. 2. Irritable bowel syndrome: patients with long-term chronic diarrhea, and there can be obvious abdominal pain or abdominal discomfort and other symptoms, but by a variety of tests have not been found to cause diarrhea organic lesions. The choice of antispasmodic agents for abdominal pain, such as anticholinergics (eg, scopolamine), smooth muscle inhibitors (eg, Mebeverine and Alverine), etc.; diarrhea symptoms are more serious, you can choose loperamide or difenoxate. 3. Bacterial dysentery: the main manifestations are abdominal pain, diarrhea, mucus, pus and blood stools, as well as the urgency and heaviness (discomfort in the lower abdomen, wanting to defecate very much, and the feeling of incomplete defecation after defecation), which can be accompanied by fever and systemic toxemia, and in severe cases, infectious shock and/or toxic encephalopathy can occur. Treatment is based on antimicrobial (antibiotics, such as ciprofloxacin, levofloxacin, etc.), rehydration, hypothermia and analgesia, and a ventilator can be applied if necessary. This symptom alone is not enough to diagnose the disease, do not rule out other factors such as improper diet and other factors caused by the patient is recommended to consult a doctor in a timely manner, please ask the doctor to clarify the cause of the disease and give targeted treatment.