Under normal conditions, the secretion, circulation, and absorption of cerebrospinal fluid (CSF) maintain a dynamic balance. In some pathological states, this balance is disrupted, leading to an excessive accumulation of CSF within the ventricular system, a condition known as hydrocephalus. Hydrocephalus can be classified into obstructive hydrocephalus and communicating hydrocephalus. The causes of obstructive hydrocephalus mainly include obstructions in the ventricular system, such as congenital malformations or abnormal development of the cerebral aqueduct, which are the most common causes of hydrocephalus in infants. In adults, tumors, bleeding, blockages, or compression of the ventricular system are also common causes of hydrocephalus. Communicating hydrocephalus results primarily from acquired diseases, such as cranial infections or blockages of arachnoid granulations by subarachnoid hemorrhage, leading to impairments in CSF absorption.