Diarrhea may be caused by improper diet, infection, gastrointestinal diseases, etc. Patients can use antidiarrheal agents, anti-infective drugs, and rehydration under the guidance of doctors. 1. Improper diet: for example, diarrhea can be caused after eating spoiled, moldy food, diarrhea is more serious, you can use montelukast, loperamide and other antidiarrheal drugs, at the same time, we should pay attention to correcting the water, electrolyte imbalance, rehydration therapy. 2. Infections: bacterial infections such as Escherichia coli, viral infections such as rotavirus, fungal infections such as Candida, and parasitic infections can easily cause diarrhea. The treatment of patients is mainly based on the cause of the disease, the use of appropriate drugs, such as bacterial infections can be used norfloxacin, levofloxacin and other drugs, viral infections choose symptomatic treatment, parasitic infections can be treated with metronidazole and so on. 3. Gastrointestinal diseases: such as intestinal flora imbalance, ulcerative colitis, etc., can also cause patients to have diarrhea symptoms. In addition to the above anti-diarrhea, rehydration and other treatments, patients also need to address the cause of the appropriate treatment. In addition to the above factors, there are many other causes of diarrhea, and it is recommended to consult a doctor when the symptoms are severe.