Lumbar puncture has certain risks, first of all, if the patient is allergic to anesthetics, there may be a local rash, and secondly, after lumbar puncture, the patient may experience pain in the lower back, and this pain will generally be relieved by itself after 2-3 days of rest. Then the lumbar puncture may also damage the local blood vessels and nerves, appearing local bleeding and pain, this kind of rest will generally improve in about 2-3 days. Finally, for patients with particularly severe intracranial hypertension, lumbar puncture is likely to cause brain herniation, which can cause cardiac and respiratory arrest at any time, which can be very fatal. Generally, the doctor will assess the patient’s intracranial pressure before the lumbar puncture, and for patients with particularly high intracranial pressure found during the lumbar puncture, mannitol will be given to lower the pressure during the operation, and then the fluid will be released slowly, and generally there is no risk of brain herniation.