Vomiting is caused by retrograde peristalsis of the esophagus, stomach or intestines, accompanied by strong spasmodic contractions of the abdominal muscles, forcing the contents of the esophagus or stomach to gush out of the mouth and nose. Severe vomiting can lead to apnea and asphyxia, and pulmonary infections can occur if vomit is inhaled. Repeated vomiting can lead to water and electrolyte disorders. Prolonged vomiting affects nutrient intake and can lead to malnutrition and vitamin deficiency. Causes of vomiting in children are as follows: 1, organic obstruction of the digestive tract: small infants are mostly congenital abnormalities in the development of the digestive tract (different parts of the stenosis or atresia), while older children are mostly acquired intestinal torsion, overlap, obstruction. Often accompanied by other obstruction symptoms: abdominal distension, bloody stool, no stool, etc. 2, infectious diseases of the digestive system: gastritis, peptic ulcer, enteritis, appendicitis, peritonitis, cholecystitis gallstone, pancreatitis, etc.. Often accompanied by abdominal pain, nausea, diarrhea, abdominal distension. 3, abnormalities of digestive tract function: various systemic diseases and metabolic abnormalities. Often accompanied by fever, nausea, abdominal distension, etc. 4, neurological diseases: intracranial hypertension occurs for different reasons (encephalitis, meningitis, intracranial occupying lesions), causing central vomiting, ejection without nausea, and other neurological signs and symptoms (headache, drowsiness, coma, convulsions). 5, abnormal cerebellar or vestibular function: changes with body position, with ataxia, vertigo, unstable gait, etc. 6.Poisoning: Poisoning or food poisoning can be manifested as vomiting, with rapid onset. 7, recurrent vomiting: also known as periodic vomiting, the onset is mostly in preschool and school age (3-10 years old), sudden onset of vomiting, recurrent, can cause water-electrolyte disorders. The disease can have a family history, and overeating, exertion, stress, and mood swings are triggers for its onset. Physical and neurological examinations of the digestive and nervous systems are unremarkable. Epileptic waveforms are occasionally seen on EEG, but antiepileptic drugs are ineffective. It usually stops spontaneously after puberty.