The essence of nonobstructive hydrocephalus is a loss of cerebrospinal fluid secretion and absorption, and most infants and children fall into this category. During the course of the disease, some patients do reach a new balance of cerebrospinal fluid absorption and secretion, and the hydrocephalus is relatively stable for a period of time and no longer develops, and the ventricles do not continue to enlarge. However, hydrocephalus and the need for surgery are two different things. Only mild asymptomatic hydrocephalus can be observed. For moderate and above hydrocephalus and symptomatic hydrocephalus, surgery is necessary. Secondly, hydrocephalus can be suddenly transformed into progressive hydrocephalus with symptoms of high cranial pressure under certain circumstances, such as cold, fever, pneumonia, excessive exercise, etc. We have met many cases of children who were diagnosed with hydrocephalus from childhood and had been under conservative observation, but suddenly developed intractable high cranial pressure in their teens, and eventually had a shunt operation. In addition, the damage caused by moderate to severe hydrocephalus may not be visible when the child is young, and only when the child is older is a variety of problems discovered, but the child has already missed the best time for treatment. Therefore, we hope that the family must consult with a professional, pediatric neurosurgeon with extensive experience in treating hydrocephalus.