Diarrhea may be caused by lactose intolerance, pathogenic bacterial infection, necrotizing enterocolitis, etc. It can be treated by dietary adjustment and medication. 1. Lactose intolerance: Relative or absolute deficiency of lactase enzyme will lead to abdominal distension, pain, diarrhea and other adverse reactions in patients after intake of milk or milk products, mostly caused by genetic factors. Avoiding lactose-containing foods or supplementing with probiotics can alleviate the symptoms. 2. Pathogenic infections: Pathogenic infections such as E. coli and Vibrio cholerae can lead to diarrhea, which is usually treated with antimicrobial drugs such as ciprofloxacin. The drug may cause abdominal discomfort, nausea and other adverse reactions, allergy, pregnant women, lactating women and patients under 18 years of age are prohibited. 3. Necrotizing enterocolitis: Intestinal ischemia and infection can cause necrotizing enterocolitis, which often causes abdominal distension, vomiting, diarrhea and other symptoms, and can be treated with surgery or ampicillin and other drugs. The drug may cause diarrhea, nausea, heartburn and other adverse reactions, allergy, infectious mononucleosis, lymphocytic leukemia, convulsions patients are prohibited. If the symptoms of diarrhea can not be relieved by themselves, please go to the hospital in time for diagnosis and treatment, and use the drug under the guidance of the doctor.