Diarrhea will cause the body water electrolyte imbalance, malnutrition, immune function decline and other harm, is no good, the specific harm is as follows. 1. Water-electrolyte imbalance: When diarrhea occurs, the human body loses a lot of water and electrolytes, resulting in dehydration and electrolyte disorders. Dehydration manifests itself in dry skin, generalized weakness and other symptoms, and in severe cases can lead to hypovolemic shock, which is life-threatening. Electrolyte imbalance will also lead to a series of symptoms, such as hyponatremia will appear nausea and vomiting, edema, etc. Hypokalemia will appear intestinal paralysis, cardiac arrhythmia and other symptoms, which need to be dealt with in time. 2. Nutrient deficiency: diarrhea, especially prolonged diarrhea, will not only lead to the loss of nutrients in food, but also lead to the intake of nutrients can not be fully absorbed. In the long run, patients will suffer from malabsorption of important nutrients such as sugar, fat and protein, leading to emaciation, anemia, hypoglycemia, vitamin deficiency, etc., which will also affect the growth and development of children. 3. Decreased immune function: long-term diarrhea due to nutrient deficiencies and intestinal dysfunction will lead to low immune function, resulting in weakened resistance to infection, increasing the chance of disease. The above can be seen, diarrhea is not good for the human body, in addition, it should be noted that the acute stage of diarrhea can not blindly use montelukast and other antidiarrheal drugs, because it may lead to viruses, bacteria and other pathogens adsorbed on the surface of intestinal mucosa, aggravating the infection, so once diarrhea occurs, it is recommended that timely consultation with a clear cause of diarrhea for targeted treatment, in order to avoid the adverse effects.