Nausea and vomiting in a thirteen-year-old child is mainly considered gastroenteritis, pancreatitis, appendicitis and other conditions. 1. Gastroenteritis: mostly related to patients eating unclean, poorly digested food, a large number of inflammatory substances stimulate the gastrointestinal mucosa, resulting in intestinal wall edema, nausea, vomiting, abdominal pain, diarrhea and other discomforts. 2. Pancreatitis: it is related to patients’ overeating and drinking, at this time, a large number of pancreatic cells are destroyed, and the pancreatic fluid stimulates and damages the intestinal wall, causing nausea, vomiting, diarrhea and other adverse reactions. 3. appendicitis: when the patient appendix inflammation, gastrointestinal peristalsis abnormal, resulting in the patient intestinal contents can not be effectively digested, causing nausea, vomiting and other discomforts. In addition, the thirteen-year-old child nausea and vomiting, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.