The normal value of cerebrospinal fluid pressure measured by lumbar puncture is 0.785-1.766kPa for adults in the lateral position.The indications for lumbar puncture to check the cerebrospinal fluid are as follows.The patient exhibits symptoms of meningeal irritation, such as headache, vomiting, suspected intracranial hemorrhage, such as cranial fracture involving bleeding brain tissue or spontaneous cerebral hemorrhage, suffers from severe headache, and the patient develops coma, seizures, or paralysis and other symptoms and signs, for which the cause has not been identified. Cerebrospinal fluid examination is required. Suspicion of meningeal leukemia, central nervous system disease, intrathecal administration of medication, surgical procedures requiring lumbar spinal anesthesia or intrathecal imaging. All of the above causes can lead to changes in cerebrospinal fluid pressure, which can cause headaches, dizziness, nausea, vomiting and other symptoms.