First of all, it is important to understand that cerebrospinal fluid is produced by intracerebroventricular tissues and that it is constantly produced and absorbed back into the veins in a “dynamic equilibrium”, so it plays an important role in the protection of the brain. When the normal flow of cerebrospinal fluid is blocked, for example, from one ventricle to another, or from the ventricles to the periventricular tissues of the brain. Or when there is malabsorption of cerebrospinal fluid or excessive production of cerebrospinal fluid, the balance between cerebrospinal fluid production and absorption is disrupted, causing cerebrospinal fluid to accumulate in the ventricles, which can lead to hydrocephalus. In addition, these are the risk factors that lead to hydrocephalus: 1. If a fetus or newborn has abnormal neurodevelopment, intraventricular hemorrhage, or intrauterine infection during pregnancy, hydrocephalus may occur at birth or shortly after birth. 2. Factors such as brain or spinal cord lesions or tumors, central nervous system infections, strokes or head occurrences leading to brain hemorrhage, and other traumatic brain injuries may also increase the risk of hydrocephalus in other age groups.