For central nervous system infections, lumbar puncture is recommended. This is because lumbar puncture is an integral part of the diagnosis of encephalitis. Many parents ask if they can skip lumbar puncture after having EEG and MRI. In fact, lumbar puncture is behind the spinal cord, the bones are one section after another, there is a gap in the middle, after the needle is inserted into the position, the cerebrospinal fluid will flow out, in fact, similar to the operation of blood sampling and injection, but the location is more special, there may be the possibility of damage to the spinal cord root. However, because the position chosen by the child is more downward, the 3rd-4th lumbar vertebral space is chosen, and the spinal cord is already bifurcated at the back, so it is less likely to be damaged. Sometimes when the child is crying and uncooperative, he/she may twist a lot, which may cause some damage, such as bleeding, and in this case, it is necessary to do it again in 1-2 days interval, otherwise there is not much adverse reaction. Many family members may consider that after the lumbar puncture, the back will be painful for life and cannot walk. After the lumbar puncture, the child will be asked to lie flat on the pillow, flat on the bed, without pillows. Because after the release of cerebrospinal fluid, low intracranial pressure, upright will appear dizzy symptoms, lying flat is to relieve the symptoms, left and right are no problem, do not lift the head can be. If there is no adverse reaction, no dizziness, vomiting and other symptoms, you can get up and move around. The wound is actually a small needle hole, a dressing will be applied, and it can be removed after 24 hours, which is not much of a problem.