If a child has a stomachache and diarrhea, it is mainly considered to be caused by improper diet or gastroenteritis. If it is only once in a while, it is considered as improper diet, parents do not need to worry too much, just observe temporarily. If the symptoms continue or worsen, consider the possibility of gastroenteritis, acute appendicitis, parents need to take the child to the pediatrician or gastroenterology consultation, for targeted treatment. 1, improper diet: If the child eats cold and stimulating, spicy and greasy food, or the type of food is too complicated, it is easy to lead to a decline in digestive function, so that the child has stomach pain, diarrhea. Usually, the symptoms will disappear naturally after rest and improvement of gastrointestinal function. Parents should pay attention to strict control of the child’s diet, food should be light, and eat small and frequent meals. If necessary, the child can also be given oral intestinal probiotics and digestive enzymes to improve the symptoms of discomfort; 2. Gastroenteritis: If the child eats unclean food, or if the child’s hands are exposed to bacteria and viruses, they are not able to disinfect their hands in a timely manner and take things to eat directly with dirty hands, resulting in bacteria and viruses entering the body, which can cause stomach pain and diarrhea. Some patients may have more mucus or pus and blood in the stool. In this case, the child needs a routine stool test to see if there are more red and white blood cells in the stool. If there are more red or white blood cells, the child should be treated with a sensitive antibiotic under the guidance of a doctor. If there is no history of drug allergy, commonly used drugs are amoxicillin or cefixime. If the child has a history of drug allergy, phosphomycin aminotriol dispersion can be chosen. At this time, it is recommended that the family adopt a meal-sharing system and strictly disinfect tableware to avoid cross-infection; 3. Acute appendicitis: If the child’s stomach pain is located in the lower right abdomen, the possibility of acute appendicitis needs to be considered. This disease is easily manifested as stomach pain and diarrhea in the form of gastroenteritis when it first attacks, and patients need to have routine blood tests, ultrasound and other related tests to confirm the diagnosis. If the diagnosis is confirmed, the patient often needs to undergo surgery to treat the disease by removing the appendix.