Acute gastroenteritis is caused by acute inflammatory changes in the mucosa of the gastrointestinal tract due to the consumption of food containing pathogenic bacteria or toxin infections, or improper diet, such as having excessive stimulating, indigestible food, and its pathological manifestations are congestion and edema, increased mucus secretion, sometimes accompanied by bleeding and erosion. Nausea, vomiting and diarrhea are the main symptoms of acute gastroenteritis, why do vomiting and diarrhea occur in acute gastroenteritis? This is mainly produced through neurological reflexes. When acute gastroenteritis occurs, as bacteria or toxins stimulate the gastrointestinal mucosa, the impulses are transmitted to the vomiting center, which sends out transduction signals that are communicated to the place, diaphragm, and whistling muscles, causing a series of strong movements that lead to the occurrence of vomiting, while the inflammatory stimulation of the intestinal mucosa increases the intestinal contents, reflexively causing an increase in intestinal peristalsis and diarrhea. Vomiting and diarrhea in some cases have a certain protective effect on the body, so in clinical work, different therapeutic measures should be taken depending on the etiology of vomiting and diarrhea. If the vomiting and diarrhea are caused by inflammation of the digestive tract or lesions in the brain, the water and electrolytes should be replenished in time to avoid disorders, and if the vomiting and diarrhea are caused by food poisoning or poisoning, the vomiting and diarrhea should be induced accordingly or laxatives should be used to make the poison excreted as soon as possible.