Cerebrospinal fluid, between the soft meninges and the arachnoid membranes, is a colorless, clear fluid found primarily in the lateral ventricles and subarachnoid space. Cerebrospinal fluid surrounds and supports the entire weight of the brain and spinal cord and is produced primarily in the choroid plexus of the lateral ventricles. The secretion and absorption of cerebrospinal fluid are in relative balance, with the production of cerebrospinal fluid being about 500 ml per day. If too much cerebrospinal fluid is produced, or if the circulatory pathways of the cerebrospinal fluid are obstructed or poorly organized, this can lead to symptoms of increased intracranial pressure, which may be manifested as severe headaches, nausea, and vomiting. The main role of cerebrospinal fluid is to act as a lymphatic fluid to the central nervous system, which is nutritious to the patient’s brain cells and can transport away the waste products metabolized by the patient’s brain tissues. It has a regulatory effect on the acid-base balance of the central nervous system and can buffer the pressure of the brain and cerebrospinal cord, which has a cushioning and protective effect on the brain and spinal cord.