The causes of spitting up in children include physiological and pathological factors. Pathological factors include pyloric stenosis, meningitis, etc., which should be consulted in time to find out the cause of the disease. 1. Physiological reasons: Due to the small volume of the child’s stomach, the horizontal position, and the poor development of the center, so it is easy to spit up, which is a physiological phenomenon. Excessive breastfeeding and large changes in body position can also cause spitting up. 2. Pathologic causes: (1) pyloric stenosis: due to congenital malformations, the pyloric sphincter is highly hypertrophied and proliferated, and the patient may have the symptom of vomiting, and with the aggravation of pyloric stenosis, projectile vomiting, accompanied by epigastric discomfort, loss of appetite and so on. (2) meningitis: meningitis is an acute inflammatory disease of the cerebrospinal membrane caused by viral, bacterial, fungal and other infections, and patients may experience projectile vomiting, mostly milk or milk curd, and in severe cases, they may have consciousness disorders and fainting. The child always vomits milk, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.