The causes of hydrocephalus include excessive cerebrospinal fluid secretion, cerebrospinal fluid absorption disorder, cerebrospinal fluid circulation disorder, etc. It is recommended that patients seek medical treatment in time. 1. Excessive secretion of cerebrospinal fluid: If the cerebrospinal fluid is secreted in excess and absorbed in an untimely manner, it will lead to hydrocephalus, which is a relatively rare cause in clinic and may be caused by diseases such as choroid plexus papilloma. 2. Cerebrospinal fluid absorption obstacle: that is, the mechanism of vascular absorption of cerebrospinal fluid is impaired, thus causing hydrocephalus, which can be caused by intracranial infection, traumatic brain injury and other diseases. 3. Obstruction of cerebrospinal fluid circulation: the normal flow of cerebrospinal fluid is blocked, causing obstruction of its circulation, thus leading to hydrocephalus, which can be caused by various intracranial space-occupying lesions, inflammatory scarring and other reasons. Patients with hydrocephalus should consult a doctor in time to find out the cause of the disease and carry out the corresponding treatment under the doctor’s guidance, and avoid making blind judgment on their own to avoid delaying the condition.