Mild hydrocephalus generally does not significantly affect intellectual levels, while moderate or severe hydrocephalus often impacts a patient’s intelligence. In children, it can cause severe impairment in intellectual development. For adults, it results in noticeable intellectual deficiencies, primarily characterized by significant cognitive dysfunction, reduced memory, diminished calculating abilities, and weakened verbal communication skills. Additionally, individuals may appear indifferent, speak less, are reluctant to interact with others, and have difficulty expressing themselves. Furthermore, most patients experience reduced orientation abilities concerning time, people, and space, which are predominantly caused by hydrocephalus.