Lumbar puncture usually does not have much risk, it is a very thin hollow needle in the spinous process of the lumbar spine, there is a core in the needle, and it goes all the way to the lumbar pool, the spinal nerves are soaked in cerebrospinal fluid, and after the core of the needle is pulled out, the fluid comes out along with the hollow needle, so there is no big risk of lumbar puncture. However, there are some situations that require special attention, such as lumbar puncture can not be done when the site is infected, there is a possibility that the infection will be carried into the cerebrospinal fluid, causing brain infection. Lumbar puncture should not be done when the intracranial pressure is particularly high, as it may induce and aggravate brain herniation, which may be life-threatening. Lumbar puncture is not risky in most cases. In some cases, the puncture may touch the spinal nerve or lumbosacral nerve, and there is a possibility of injury, but most of the damage can be repaired very quickly, and it usually does not cause serious problems. As long as it is done according to normal requirements and is not particularly rough, there is usually no major risk. Therefore, lumbar puncture is usually a test without great risk.