Encephalitis is a very common infectious disease of the central nervous system in children, and it can be very harmful to children, and if left untreated, can cause very serious consequences. We can determine this by the following symptoms: First, hyperactivity. Encephalitis can stimulate the cerebral cortex and cause pathological excitement in children, which leads to hyperactivity and emotional irritability, so if a child has hyperactivity, it must be brought to the attention of parents. Second, fever and headache. Encephalitis can cause the body’s immune system to become dysregulated, leading to a high fever. High cranial pressure can cause headaches, and in some severe cases of encephalitis, there can be sleep talking and sleepwalking when the fever is high. Third, pain in the body. This is due to the fact that encephalitis stimulates the whole body’s immune system to work for a long time, resulting in a pathological autophagy phenomenon. Fourth, blindness and deafness. Some patients with severe encephalitis also suffer from brain damage, resulting in blindness. This is because encephalitis spreads to all parts of the brain and the inflammation stimulates the cerebral cortex, which is likely to cause blindness and deafness. It is easy to see that the symptoms of encephalitis can be very serious, so if your child has any abnormalities, you should go to the hospital in time for the relevant tests.