Intracranial pressure refers to the pressure inside the brain, which is soaked in a basin of water that provides protection and cushioning to the brain tissue. But there is also a certain amount of pressure, which means that there is a certain amount of pressure in the cerebrospinal fluid. In some cases, there will be an increase in intracranial pressure, such as with encephalitis and trauma, and the patient will experience headaches, nausea, vomiting, etc. Low intracranial pressure can also occur, such as having a small needle or trauma that causes cerebrospinal fluid to leak outward, and the clinical manifestation is also headache, which is related to the body position, no headache when lying down, and a headache may occur in 5-10 minutes after sitting up. Intracranial pressure can be monitored clinically. It can be to be monitored by lumbar puncture, which is a lumbar puncture to monitor intracranial pressure. The normal intracranial pressure should be 80-180 mmH2O, too high or too low is abnormal and means that something is wrong and needs to be treated.