Children vomiting in the middle of the night and drinking water, can be considered by viral enteritis, intussusception or acute appendicitis and other causes. 1. Viral enteritis: can be caused by rotavirus, norovirus, etc., acute onset of fever, vomiting, diarrhea and other symptoms, can be discharged yellow or yellow-green watery stool. Symptomatic treatment is sufficient. 2. Intussusception: viral infection, dietary changes or primary factors can cause intussusception in children, who have abdominal pain, vomiting, bloody stools, abdominal masses and other manifestations. They should be hospitalized as early as possible to clarify their condition and intervene for treatment as early as possible. 3. Acute appendicitis: when children have acute appendicitis, there are metastatic abdominal pain, gastrointestinal symptoms such as nausea, vomiting and other manifestations, so children can vomit in the middle of the night. Pediatric vomiting in the middle of the night is recommended to immediately go to the hospital specialist, to clarify the cause of the disease, timely replenishment of water and electrolytes to prevent dehydration, and to treat the cause of the symptomatic treatment.