Mild hydrocephalus usually does not heal on its own. Hydrocephalus is commonly caused by cerebral hemorrhage, traumatic brain injury, or brain tumor that obstructs the cerebrospinal fluid circulation or impairs absorption. Mild hydrocephalus is usually caused by cerebral hemorrhage, traumatic brain injury or early brain tumor, where the cerebrospinal fluid circulation is not completely obstructed or the absorption is mildly impaired. For mild hydrocephalus caused by cerebral hemorrhage or traumatic brain injury, most of the time, it remains in a static state for a long time, and patients usually have no symptoms, so it can be left untreated and can be reviewed regularly. If it is mild hydrocephalus caused by brain tumor, as the size of tumor increases, the obstruction will become heavier and heavier, and the hydrocephalus will become heavier and heavier, so timely brain tumor resection is needed to relieve the hydrocephalus.