In the summer, children are most likely to fall ill with diarrhea. Generally speaking, diarrhea is a disease of the intestinal tract, but sometimes it can cross the “minefield” and affect the heart and even the brain and cause serious trouble. The heart of the disaster Yang Yang Yang ate several popsicles on his birthday, and in the evening, his stomach became uncomfortable and he had several loose stools. Yang Yang’s mother rushed to get Huang Lian Su from the medicine cabinet and gave it to him. The next day, Yang Yang felt better, but his appetite became worse and his body temperature rose slightly. Yang Yang’s mother mistakenly thought that Huang Lian Su was too weak, so she replaced it with Gentamicin injection for oral use. After two days, Yang Yang’s condition became even worse, he was depressed, his face was a little white, he was dizzy and his heart was beating. Yang Yang’s mother panicked and did not dare to “treat” him any further, so she sent him to the hospital pediatric department. The doctor’s examination results: Yang Yang has myocarditis, fortunately admitted to the hospital in time, otherwise the consequences will be serious. There are many causes of diarrhea in children, and in terms of pathogenic microorganisms, there are bacteria, fungi, viruses and so on. Viruses cause the most diarrhea, accounting for about 70% of the total incidence, such as coxsackievirus, echovirus, poliovirus, rotavirus, etc. These intestinal viruses have a strong “affinity” for cardiomyocytes, and when the child’s resistance decreases, they will “take advantage of the situation Yang Yang is because of eating unclean popsicles and hit by the virus trick. Once the myocardium is affected, in addition to symptoms such as atrophy and poor food, dizziness and whiteness, there may also be fatigue and sweating, rapid or slow heartbeat, chest tightness, discomfort or pain in the precordial area. In severe cases, heart failure such as facial swelling, inability to lie down, and difficulty in breathing may occur, endangering life. The diarrhea of Xue Xue was different from both of the above cases in that it developed two days after eating cold food, and instead of the usual dilute stools as the first symptom, she had a sudden high fever with a body temperature close to 40°C, blue lips and repeated cramps. Xue Xue’s parents thought she had meningitis and rushed her to an infectious disease hospital. After laboratory tests, Xue Xue got the brain type of toxic bacillary dysentery. Toxic bacillary dysentery, commonly known as toxic dysentery, affects children aged 2 to 7 years old, is a particularly critical type of bacterial dysentery, and can be divided into 3 major types, in addition to the brain type like Xue Xue, there are shock type, mixed type. Brain type dysentery often appears severe toxemia, if not treated in time, it can lead to respiratory failure and kill the person. Shock type poisonous dysentery can appear with little or no urine, depression, pale face, cold skin, fine pulse, fluctuating or low blood pressure and other symptoms. Mixed dysentery has the characteristics of both types, and is the most dangerous type of dysentery, with a very high death rate. Poisonous diarrhea is in the intestinal tract of children, but how can it affect the brain, which is the “head” of the body? It turns out that the child’s brain is in the developmental stage, the function is not perfect, the defense barrier between the blood and the brain (medical called “blood-brain barrier”) is not sound, so the toxins produced by poisonous dysentery are absorbed into the blood through the intestinal mucosa and invade the brain with the blood circulation across the blood-brain barrier. It can be said that the heavier the symptoms of poisonous dysentery, the more toxins are produced, the more serious the brain lesions are, and the more dangerous the consequences. Even if the child is saved, he or she may be left with paralysis, mental retardation, epilepsy, blindness and other sequelae, causing lifelong pain. The key to the prevention of poisonous dysentery is to keep the “disease from the mouth” off, parents should care about their children’s food and drink hygiene, especially in the summer when bacteria are active, eat cold dishes especially cautious.